WO1990009858A1 - Pulse welding apparatus - Google Patents

Abstract

A pulse welding apparatus such as of arc welding or short-circuiting arc welding that effects the welding utilizing pulse discharge that develops at the tip of a wire electrode, wherein undercut which is a defect in the shape of welding beads develops which deteriorates the welding when the timing for removing the molten mass grown at the tip of the wire electrode is delayed due to a change in the welding condition or disturbance. To eliminate this defect, the pulse current fed to the material to be welded is divided into a plurality of pulse groups, the pulse groups are allowed to have an average current of a maximum peak after a predetermined period of time has passed from the start of the pulse, the pulse current groups are allowed to have a mountain shape in compliance with the removing phenomenon of the molten mass, and pulse period, pulse width and pulse gap of pulse current groups are differed depending upon the wire feed speed or the pulse group period. In the short-circuiting arc welding method, furthermore, the short-circuiting and arcing periods are instantaneously controlled depending on the detected arc length or the wire feed speed to quickly obtain ideal arc length. By so doing, the molten mass can be regularly removed and moved onto the material to be welded. Even in the short-circuiting arc welding, furthermore, variation decreases between the short-circuiting period and the arcing period. Therefore, growth and removal of the molten mass can be controlled independently of the magnetic blow phenomenon of arc, and favorable welding is carried out to improve the quality irrespective of a change in the shape of welding joint and earth point in real arc.

Description

 Specification

 Pulse welding equipment

 Technical field

 Welding equipment utilizing pulse discharge, that is, pulse welding equipment, and more specifically, high quality by imparting regularity and controllability to characteristic phenomena such as melting and detachment of discharge electrodes. The present invention relates to a pulse welding apparatus designed to obtain a proper welding.

 Background art

As examples of arc welding equipment, pulse arc welding equipment, short-circuit transition arc welding equipment, and especially pulse current groups consisting of multiple pulse groups are used. There is a pulse arc welding device, but the former pulse arc welding device is a consumable welding wire electrode (hereinafter simply referred to as an r wire electrode) and an object to be welded. A pulse arc current is generated in between, and the work and the wire electrode are melted by the heat of the pulsed arc discharge that is generated at that time. In addition, the electrode is transferred to the welded part by the electromagnetic kinetic force of pulsed arc discharge and welded.The latter pulse arc welding equipment has multiple pulse current waveforms. It consists of pulse currents, and this pulse current group is repeated periodically. One pulse is divided into a plurality of pulses as a discharge current waveform to be returned, and the pulse current waveform is divided by this pulse current waveform so that the pulse current above the pulse arc discharge at the wire electrode is divided. The electromagnetic force in the direction becomes intermittent, and the force for lifting the molten mass formed at the tip of the wire electrode is moderated. It is the one that has the effect of summing.

 In addition, the short-circuit transition arc welding equipment repeats short-circuiting and arcing periodically and generates heat by the arc discharge generated when an arc current is generated between the wire electrode and the workpiece. The welded object and the wire electrode are melted, and then the welded object and the wire electrode are short-circuited to cover the molten mass formed at the tip of the wire electrode. This is a device for short-circuiting and welding to the work.

Referring specifically to the former pulse arc welding apparatus, FIG. 53 (a) shows, for example, the conventional pulse arc welding apparatus disclosed in Japanese Patent Application Laid-Open No. 57-19177. FIG. 2 is a configuration diagram of a welding device. In the figure, (32) is a DC power supply and (93) is a switching element. Its function is to supply the current supplied from the DC power supply (92) to 0N-0FF In this way, it is composed of a power transistor element that forms a pulse-like current waveform, and the current is chopper-controlled. In addition, the welding torch (51) constitutes the arc load, and the wire electrode is supplied from a wire reel by forming the filler material into a wire. (52), arc discharge (53), workpiece (46) and workpiece (54). (93) is a base current output device for supplying a continuous base current for preventing occurrence of arc break between the pulse and the pulse, and (94) is a switching element ( The control circuit controls the pulse frequency and the pulse width of the pulse current to a preset value by controlling (95), and (6) the current detection for detecting the current i. It is a vessel. Next, the operation of the pulse arc welding apparatus will be described.

 In general, the pulse arc welding apparatus melts the tip of the wire electrode (52) with the pulse arc current even if the average current is smaller than that of the DC arc welding apparatus, and Since the melted wire electrode tip is separated by the electromagnetic force of the pulse arc current, welding can be performed with a lower average current than with a DC arc welding machine, and thinner welded products can be welded. However, since the tip of the wire electrode can be separated in space by the electromagnetic force, it is possible to eliminate the "snotter" generated during welding. If you can, there is a raid advantage.

 Fig. 54 (a) shows an example of the pulse arc current waveform, in which the wire electrode material is mild steel, the wire electrode diameter is 1.2 mmφ, and the atmosphere gas is aluminum. This is an example of a pulse arc current waveform when gon gas is mixed with 20% C02 gas.

 Next, the short-circuit transfer arc welding apparatus will be specifically described. FIG. 53 (b) is a configuration diagram of a conventional short-circuit transfer welding apparatus disclosed in, for example, Japanese Patent Publication No. 62-54585. You.

In the figure, (7) is the voltage detector that detects the voltage V between the wire electrode (52) and the workpiece (54), and (94a) is the voltage detected by the voltage detector (7). V and the voltage V corresponding to the short circuit. (Voltage at short circuit or voltage just before short circuit) and V ≤ V. The switching element (35c) should be set to 0 N and the command signal should be given to the switching command circuit (94c). The first decider you cross, (94 b) is an atmospheric of the voltage V _a you corresponds to the voltage V and arc regeneration detected by the voltage detector (7) is compared, V≥ V _a When the switch is turned on, the switching element (95) is turned off to the jig command circuit (94c). Fig. 54 (b) is a current waveform diagram for this welding machine.

Next, this operation will be described. First, with the DC power supply circuit (92) and the input switch (not shown) of the base current output device (93) turned on, the tip of the wire electrode (52) is welded. Short the object (54). The detection voltage V of the voltage detector (7) is the voltage V corresponding to a short circuit. Since it is smaller (V ≤ V), the first judgment device (94a) operates, an ON command signal is sent to the switch command circuit (94c), and then the switch command circuit (94c) is sent. A trigger signal is sent from the switch command circuit (94c), the switching element (95) is closed, and current is supplied from the DC power supply circuit (92). This current flows until the wire electrode (52) burns out and an arc is generated, and the detection voltage V of the voltage detector (7) rises from the short-circuit voltage to the arc voltage. When you try its operation of the first judgment unit (94a) is stopped, and eventually the detection voltage V arc re-live the equivalent to that voltage V _a by Ri atmosphere rather than the Do that (V ≥ V _a), The second judgment device (94b) operates, the OFF command signal is sent to the switch command circuit (94c), the trigger signal from the switch command circuit (94c) is cut off, The switching element (95) is opened, the current is attenuated by the reactor (lb) and the base current output Only the current supplied from (93).

 Thus, in the first arc period B, the wire electrode and the base metal are heated and melted, and the welding wire (52) is fed. The motor is fed to the torch (51) and the melted wire tip (52) is short-circuited to the base metal, the switching element (95) is closed again and the DC Current is supplied from the power supply circuit (92), and the transfer of the molten wire electrode (52) to the base material (54) is completed. By repeating such an operation, a current waveform as shown in FIG. 54 (b) is obtained, and a stable welding state is maintained.

 In order to obtain high quality welding by the former pulse arc welding, there is no spatter of the welded material generated during welding, and the undercut which is a defect in the weld bead shape And the size of the separated molten mass needs to be substantially uniform. Therefore, in order to eliminate the spatter, make sure that no contact (short circuit) occurs between the wire electrode and the work to be welded, and also to prevent undercuts. It is necessary to shorten the arc length. In order to make these two requirements compatible, it is important to achieve a fine-grained (spray transfer) of the detachable molten mass. Further, in order to make the size of the detached molten mass uniform, the pulse wave current waveform is obtained by repeating the same pulse shape periodically. Can be solved.

In filtration come when, to form the word i ya electrode arc welding at a mixed gas atmosphere of A Le Gore emission gas and ₂ 0% C 0 2 gas Since the arc spreads sufficiently large with respect to the molten mass, the refined molten mass formed by periodic repetition of the pure pulse as shown in Fig. 54 (a) is regulated. to Ki out and call Ru by withdrawal, Ho in § over click welding of a good prize welding is have you in the atmosphere of the line picture Ru is 100% C 0 ₂ gas, the arc against the molten mass Because the spread is small, a pure pulse such as that shown in Fig. 54 (a) results in the phenomenon shown in Figs. 55 (a) and (b) and good welding cannot be performed. One or is, if the length Ku the Te pulse width and a low Ku set the base current I _B to power sale good in FIG (b),-out electromagnetic force F is upwards work that by the pulse current, Wa I the shape of catcher electrodes (52) molten mass of the tip (52 a) is molten mass (52 a) is lifted et al is in cormorants good of state to the state of Pb 1 of Po, the status of P b ₂ after its As described above, the molten mass (52a) can be released by the pulse current, but the released molten mass rotates at a high speed and does not fall to the workpiece side without falling. path jitter and the Ri was scattered Fei Pi is, have Ru Oh is P b ₂ good jar in this withdrawal the molten mass of the state 'of cormorants or to adhere to again Wa Lee ya electrode (52).

100% C0 in ₂ atmosphere and pulsed arc welding with the row of the Hare equipment 56 Let's Do pulse welding device there is shown in FIG Ru. Regarding the pulse arc current waveform in this device, as shown in the current waveform shown in Fig. 57, the pulse current waveform is composed of a plurality of pulse currents, and this pulse current group is Since the discharge current waveform was repeated periodically, one pulse was divided into a plurality of pulses, and the pulse current waveform was divided by this pulse current waveform. Pulse arc discharge at the ear electrode Since the upward electromagnetic force is intermittent, it acts to 'reduce the force of lifting the molten mass formed at the tip of the wire electrode. For this reason, atmospheric gas not a et such only gas A Le Gore emissions mainly, G 0 ₂ molten mass formed at the tip of the gas Oite also Wa Lee ya electrodes readily previously ing and Daikatamari break away . In the following, if you describe the operation of the migration phenomenon of the molten mass of this, Ni would Yo fifth 7 Figure periodically Te predetermined pulse width, the pulse groups arc current period C _A When it flows, the molten mass formed on the wire electrode is synchronized with the pulse group and regularly undergoes “growth of molten mass” and “separation of molten mass” as shown in Fig. 57. Return. In other words, the molten mass sufficiently formed on the wire electrode at the start of the pulse group is caused by the molten mass vibration caused by the arc discharge corresponding to the pulse frequency of the pulse group. After the neck was formed and separated due to the promotion of the neck, and the molten mass was separated, a new molten mass was lifted up again at the tip of the wire electrode by the pulse group. It grows and grows. Subsequently, the molten mass at the end of the wire lifted up during the base period hangs down, and the shape of the molten mass is adjusted by the start of the next pulse group.

 Next, see Fig. 56 and Fig. 57 for pulse arc welding equipment using a pulse current group consisting of a plurality of pulse groups as the arc current of the above arc welding equipment. It will be explained. Fig. 56 is a block diagram of a conventional pulse arc welding equipment.

The configuration of the arc welding power supply for power supply in the figure is (1) Is an inverter circuit section that converts a three-phase AC voltage into a predetermined frequency and outputs it to a transformer (3); (2) an inverter drive circuit that drives the inverter circuit; 4A) and (4B) are diodes that rectify the transformed inverter output and obtain an arc current consisting of a pulse current. (51) is a welding torch, (52) is a wire electrode fed from a wire reel by a feed roller in the direction of the workpiece (54), and (53) is a wire electrode. An arc generated between the wire electrode (52) and the workpiece (54), (7) is a voltage detector that detects the arc voltage, (6) is a current detector that detects the arc current, (9) Is a wire feed speed setting device that sets the wire feed speed, and (10) is a wire feed that feeds the wire electrode (52) to the work (54). (11) is an average voltage setting device for setting the average arc voltage. (8) is a pulse current waveform control circuit that sets a pulse current group and outputs it as an arc current. The pulse current shaper (81) includes a pulse waveform shaper (81) and a pulse group. period C _B setter (82), pulse group period X setter (83), pulse group waveform setting unit (84), pulse width Te setter (85), pulse periodic G _A setter ( 86), an adder (87) that adds the generated pulse current group and the base current output from the base current output unit (88), and compares the arc current detection value with the pulse current group output It consists of a comparator (89) and a pulse current output device (81a).

Fig. 57 is a schematic diagram showing the form of molten mass transfer when welding is performed with the pulse arc current group waveform generated above. In the figure Per cent Rere Te, I _P is the pulse Bee leakage current value, Te is pulse width, T _A is the pulse interval Pulse current group in X, CA is Repetitive cycles of pulse current, IB is the base current value, T _B is Ru Ah in Repetitive cycles of Repetitive interval, C _B Ho pulse current group X of pulse current group X.

 Next, the operation of the conventional device will be described.

Also not a, Pulse group waveform setting unit (84), Pulse width Te setter (85), pulse period C _A setter (86) or al its Rezorepa Angeles group waveform signal, Pulse The pulse width signal and the pulse cycle CA signal are sent to the pulse waveform shaper (81). Also, Pulse group cycle C _B setter (82), pulse group period X setter (83) or al respectively Pulse waveform shaping pulse group period C _B signal and Pulse group period X signal To the vessel (8 1). Be that a pulse waveform shaper (81), specific pulse group waveform, the Tsupa pulse group signal also pulse period CA of the above pulse group period C _B signal and pulse group period X signal The waveform is shaped into the intermittent pulse group waveform shown in Fig. 57. Et al is, you shaping to the base current output unit (88) or these base current I _B signal waveform obtained by superimposing a DC current IB to the intermittent Pulse group waveform (57 view). By inputting the shaped pulse current group signal and the current signal detected by the current detector (6) to the comparator (89), the pulse current group signal and the detected current signal are obtained. An inverter drive signal corresponding to the magnitude relationship is transmitted from the inverter drive circuit (2) to the inverter circuit section (1), and drives the inverter. The pulse arc current group shown in Fig. 57 is supplied to the welded part by driving this in-notter.

 In the arc load section (5), the wire electrode (52) is continuously supplied by a motor (not shown) simultaneously with the supply of the pulsed arc current group. Accordingly, a pulse discharge (53) is generated between the wire electrode (52) and the work (54) by the pulse arc current group, and the work to be welded is generated. (54) and the tip of the wire electrode (52) are melted by pulse arc discharge (53). The welding is performed by continuously dropping the molten portion of the wire electrode (52) to the molten portion of the workpiece (54). Naturally, the wire electrode (52) is continuously consumed. The wire electrode (52) is continuously fed to the welding tip (51) by the above motor to compensate for the consumption.

Next, the high-frequency characteristics of the above pulse arc current waveform IP will be described with reference to FIG. 57.The pulse width of one pulse current becomes shorter. Since the pulse current in the pulse current group X is intermittent, the magnitude of the electromagnetic force generated by the pulse current is large or small corresponding to the application of the pulse current. Changes to. Then, the force exerted on the molten mass (52a) formed at the tip end of the wire electrode (52) is the pulse beak current when the pulse current is applied. that by the I _P electromagnetic force F is a mainstream, if pause energization pulse current, counteracting against the by that the electromagnetic force when energized pulse current, the surface tension of the molten mass, or gravity, etc. Is dependent on the base current. This force is much stronger than the electromagnetic force, and these forces act on the molten mass (52a) as the binding force P. Its Me other, the molten mass (52 a) formed at the tip of the word Lee Ya electrodes ⁽⁵ 2) is ing to the this you vibrate Tsu by the pulse frequency of the pulse current group X. Due to the vibration of the molten mass (52a), the pulse peak current at which the "necking" at the boundary between the wire electrode and the molten mass was hardly generated in the conventional method Even in the region of the value Ip, it is possible to quickly generate the “constriction” B, and the detachment of the molten mass (52a) becomes easy.

In the welding process, the molten mass released by the pulse current group X as described above is refined and transferred to the workpiece side in a regular manner. In order to obtain a uniform weld bead, a pulse consisting of multiple pulse currents with a pulse interval TA and pulse width τ is set. and this to repeat the current group X at every constant period C _B is Ru Oh needed.

On the other hand, when performing arc welding while moving the wire electrode that generates the arc in a fixed direction on the workpiece, the arc from the welding torch and the arc from the arc to the workpiece. The distribution of the magnetic field formed in the welding space changes depending on the flowing current process. That is, the magnetic field distribution in the welding space due to the difference in the shape of the weld joint and the ground point differs depending on the case-by-case. An electromagnetic force acts on the arc due to the magnetic field distribution and the direction of the arc current, and a magnetic blowing phenomenon occurs in which the arc is inclined with respect to the workpiece. This magnetic blowing phenomenon corresponds to the process of detaching each molten mass in Fig. 58. As shown in (Al) to (C-1) and (A-3) to (C-3), the arc length increases because the molten mass is lifted by the deflected arc. However, it becomes difficult to regularly break away from the rose. Therefore, in order to solve such a problem, the arc current to the wire electrode is set so that the momentary arc length is adjusted to the arc length along the target arc length signal. In addition to reducing the melting capacity by lowering the magnetic force, the electromagnetic force proportional to the square of the arc current I is reduced, thereby suppressing the lifting of the molten mass by magnetic blowing. did.

Also, if example words and about the short-circuit transition arc welding, 59 view (S! A) ~ (S 3 a) to如rather indicated at I that arc deflected come magnetic blow, Wa Lee Ya electrode When the molten mass that has grown at the tip is pushed upward, the short-circuiting time of the molten mass changes, and the short-circuiting cycle of the arc is disturbed. Therefore, in order to control the arc current and suppress the lift of the molten mass due to magnetic blowing as described above, the arc length at each moment is set to the target arc length. In order to make the arc length along the long signal, the arc current to the wire electrode is reduced, the melting capacity is reduced, and the electromagnetic force proportional to the square of the arc current value I is reduced. By weakening, the lifting of the molten mass due to magnetic blowing was suppressed.

Teeth or to such but al, when cormorants rows pulse arc welding in an atmosphere of 100% C 0 ₂ gas, if small rather sets the pulse beak current value IP, melt formed at the tip of the word i ya electrode The lump is lifted up by the pulse, and the molten lump is separated until it becomes a large lump. The molten mass formed at the tip of the wire electrode becomes a large mass, and as a result, the molten mass short-circuits with the work piece and goes to the welding area during welding. Ri Many of the scan path Uz data was Tsu Tobichi, a down Dah force Ru Oh in the welding bead defect, Soviet door Ri was Ji raw ', was or, you high click the pulse beak current value I _P As a result, the volume of the power supply unit of the device has become larger, the weight has become heavier, and the cost associated with that has increased rapidly.

 Therefore, in order to solve the related problems, a plurality of pulse current waveforms having one or more pulse widths and arranged at one or more pulse intervals Is divided into a set of pulse currents (pulse group), and this pulse group is repeated every period, and a continuous base current is superimposed on this group to obtain a discharge current waveform. As a result, the lifting force of the molten mass formed at the tip of the wire electrode is reduced, the molten mass transferred to the work is reduced, and the molten mass is reduced. The company has applied for a patent (Japanese Patent Application No. 62-309388, Japanese Patent Application No. 63-265083) in Japan for a pulse welding device that performs the transition regularly.

However, in this pulse welding apparatus, if the separation time of the molten mass is delayed due to fluctuations in welding conditions or disturbance, the molten mass at the tip of the wire electrode in the next cycle will be sufficient. They cannot grow and, consequently, the molten mass in the next cycle cannot be released, or it becomes irregular and good welding cannot be obtained. For this reason, it was necessary to reduce the variation in welding conditions and take sufficient measures to prevent disturbance. In addition, it is necessary to vary the wire feed speed according to the base material (weld) to be welded, and when varying the wire feed speed, the pulse current group waveform is used. Must also be changed at the same time, but only the period of the pulse current group changes according to the wire feed speed, so the wire feed speed for feeding the wire electrodes changes. Therefore, the pulse interval within the pulse group was constant even if the wire feed speed or the pulse group cycle changed, or the pulse interval within the pulse group became constant. If the pulse group cycle becomes longer when the wire feed rate decreases, the growth rate of the molten mass due to the pulse current group will be faster than the wire feed rate during the pulse group period. As a result, the arc length between the wire electrode and the workpiece becomes longer than the allowable value, making it easier to elongate.As a result, the workpiece itself melts. That Do Ri to trick melting width is widely of by Ri base material and child, good welding Tsu Do and occurs factor of A down Daka Tsu door is ing Ku obtained et Lena.

 Similarly, when the average voltage of the pulse current group waveform is increased to a predetermined value or more, the peak value of the pulse group waveform during the pulse group period increases, and the unit time is increased per unit time. Current value increases, the growth rate of the molten mass by the pulse current group increases, and the arc length between the wire electrode and the workpiece becomes longer than the allowable value and easily elongates. As a result, the portion of the workpiece itself that is melted by the arc, that is, the melting width of the workpiece becomes too wide, which causes undercutting, resulting in good welding. Cannot be obtained.

In addition, the amount of molten mass before and after the No. Therefore, before leaving, the electromagnetic force generated by the pulse does not act so much to lift the molten mass, but after leaving, the amount of melting at the tip of the wire The electromagnetic force generated by the pulse works strongly to lift the molten mass. Regarding the difference in the degree of the action of lifting the molten mass, the pulse welding apparatus described above repeats the process until the molten mass grows out of the growth of the molten mass during welding. During the process, the pulse interval, pulse width, and pulse period in the pulse group were constant, so after the molten mass was separated, the remaining molten mass depended on the pulse. And the arc length between the wire electrode and the workpiece is longer than the allowable value, and it is easy to elongate.As a result, the workpiece itself is melted. As the melting width of the base metal becomes wider, an undercut is generated and good welding cannot be obtained.

 That is, due to the lifting of the molten mass, the quality of the weld bead is easily affected by changes in welding conditions or disturbances, and the cycle of the molten mass to be released is reduced. As a result, the average welding bead cannot be obtained.

Furthermore, after the molten mass has detached, the remaining molten mass is easily lifted by the pulse, and the arc length is constant under the conditions that the pulse interval, pulse width, and pulse period are constant. Therefore, it is difficult to obtain a uniform weld bead by repeating the regular detachment of the molten mass, which fluctuates the detachment cycle of the molten mass. Become . Furthermore, in order to make the arc length along the target arc length signal the momentary arc length, the arc current to the wire electrode is reduced and the melting capacity is reduced. In addition, if the electromagnetic force proportional to the square of the arc current value I is weakened to suppress the lift of the molten mass due to the magnetic blowing, the arc current decreases. Since the molten mass at the tip of the wire electrode does not grow sufficiently, the release of the next molten mass is delayed, and the regular molten mass is not repeatedly released. No arc is obtained, and according to the short-circuit transition type arc welding equipment shown in Fig. 53 (b), the arc length at every moment is the target arc. In order to make the arc length along the long signal, the arc current to the wire electrode is reduced, the melting capacity is reduced, and the arc length is reduced. If an attempt is made to suppress the lift of the molten mass due to magnetic blowing by weakening the electromagnetic force proportional to the square of the arc current value I, the arc current will drop due to a decrease in the arc current. Since the molten mass at the tip of the electrode does not grow sufficiently, a good short-circuiting of the molten mass to the side of the work to be welded does not take place during the next shortening period, resulting in the occurrence of snorter. However, as a result, a good weld bead was not obtained.

Furthermore, if the time of separation of the molten mass is delayed due to fluctuations in welding conditions and disturbances, the molten mass at the tip of the next wire electrode cannot grow sufficiently. As a result, the next molten mass cannot be separated or becomes irregular and good welding cannot be obtained. For this reason, it is necessary to suppress the fluctuation factors of the welding conditions and to take sufficient measures to prevent disturbance, and the welding control becomes complicated. There was a problem.

 Therefore, an object of the present invention is to be able to do the following. The purpose is to suppress fluctuations in the time at which the molten mass separates and to achieve good welding.

 Even if the wire feeding speed changes, the arc length can be suppressed to a value below the allowable value that does not cause undercut, and good welding can be performed. The aim is to obtain a welding device.

 In addition, the present invention suppresses the arc length to an allowable value that does not cause undercut even under welding conditions with a low wire feed speed or a high average voltage. The purpose of the present invention is to obtain a pulse welding apparatus capable of performing good welding.

 Even in the case of welding conditions where the pulse group period becomes long, the arc length can be suppressed to a value below the allowable value that does not cause undercut, and good welding can be performed. The purpose is to obtain pulse welding equipment.

 Even if the molten mass is separated at different times, if the arc length can be suppressed below the allowable value that does not cause undercut and the welding can be performed regularly. In addition, the purpose is to obtain a pulse welding apparatus capable of obtaining a uniform weld bead.

Prevents fluctuations in the cycle of molten mass release due to the increase in arc length after the molten mass is released, and performs regular welding. The purpose is to obtain a pulse welding apparatus that can obtain a uniform welding bead.

 In addition to preventing irregular detachment of the molten mass due to the magnetic blowing phenomenon, the melting volume of the molten mass is secured in each cycle, the detachment cycle is performed regularly, and good arc welding is performed. The purpose of the present invention is to obtain an arc welding device that can obtain a large amount of molten mass while preventing the molten mass from being irregularly short-circuited due to the magnetic blowing phenomenon. The purpose of the present invention is to obtain an arc welding device capable of performing a short-circuit transition welding by ensuring a short-circuit cycle regularly.

 The purpose of the present invention is to provide an arc welding apparatus capable of performing good welding in a case where the time of separation of the molten mass fluctuates.

 Disclosure of the invention

 In the first invention, when a plurality of pulse currents having one or more pulse widths and pulse beak values are concealed at one or more pulse intervals, the pulse transmission starts from the start of pulse transmission. After the set time, the pulse current group whose average current value during the pulse group period is the maximum beak value and the above pulse current group are repeated periodically, and the continuous base current is superimposed on this Even if welding conditions fluctuate and disturbances occur due to having the discharge current waveform formed in this way, by setting the time of separation of the molten mass corresponding to these fluctuations, the effect is suppressed. The effect is that good welding can be obtained.

Further, the second invention is characterized in that at least one kind of pulse width and pulse A group of pulse currents in which multiple pulse currents having a beak value are distributed and arranged at multiple pulse intervals with different pulse periods according to the wire feed speed To

 Further, in the third invention, a plurality of pulse currents having one or more pulse beak values are determined by varying the pulse width according to the wire feed speed. The pulse current group distributed and arranged at the pulse interval of

 Further, in the fourth invention, a plurality of pulse currents having at least one kind of pulse width and pulse peak value are supplied in accordance with the wire feeding speed. The pulse current group, which is distributed and arranged at a plurality of pulse intervals with different periods and pulse widths, and the pulse current group described above are periodically repeated. By using a discharge current waveform characteristic formed by superimposing a continuous base current, the growth rate of the molten mass can be controlled in accordance with the wire feed rate, and therefore the wire can be controlled. This has the effect of suppressing fluctuations in the arc length due to the feed speed and obtaining good welding. Also, according to the fifth invention, a plurality of pulse currents having one or more pulse widths and pulse beak values are not arranged at one or more pulse intervals. At the same time, the average current value during the pulse group period after the set time from the start of pulse transmission becomes the maximum beak value, and according to the wire feed speed or the average voltage value. A pulse current group in which the gradient of the average current value forming the beak value is variably controlled.

Alternatively, according to the '6th invention, the current value becomes A pulse current that is a beak value, and a gradient of an average current value that forms a beak value in accordance with a wire feed speed or an average voltage value is variably controlled, and the pulse current. Is periodically repeated, and the discharge current waveform is formed by superimposing a continuous base current on this pulse.After the set time, the average current value becomes a beak value Since the gradient of the pulse current or pulse group current waveform of the welding equipment is variably controlled according to the set wire feed speed and average voltage value, the generated arc length is less than the specified value. To prevent the occurrence of under-cuts, which has the effect of obtaining good welding.

 According to the seventh invention, the pulse intervals of a plurality of pulse currents having one or more pulse widths and pulse beak values are distributed and arranged according to the pulse group period. And a discharge current waveform formed by repeating the above-described pulse current group periodically and superimposing a continuous base current on the pulse current group. As a result, the growth rate of the molten mass can be controlled in accordance with the pulse group period, and the arc length generated accordingly is suppressed to a predetermined value or less, so that good welding can be obtained. There is.

Further, the eighth invention is a means according to the seventh invention, which is a means for making the amount of charge of the energy or pulse current group by the pulse current group during the pulse current group period substantially constant to a predetermined value. As a result, even if the pulse period in the pulse current group changes, the energy of the entire pulse current group or the charge amount of the pulse current group Since the molten mass is made substantially constant, the melting capacity of the molten mass by the pulse group can be made approximately constant, and the welding can be performed with a more regular molten mass separation cycle. .

 According to the ninth invention, at least one of a plurality of pulse currents having at least one pulse width and a pulse peak value has at least a pulse interval or a pulse width or a pulse period. One of the pulse current groups is arranged in a dispersed manner by making one of them different in synchronization with the detachment of the molten mass at the tip of the wire electrode, and the above-described pulse current group is periodically repeated. It is characterized by having a discharge current waveform formed by superimposing a continuous base current on it, so that the remaining molten mass after the molten mass separates becomes a pulse. As a result, the pulse length (base current period) can be increased by increasing the pulse interval (base current period), thereby increasing the pulse pause period to reduce the lifted molten mass. It may be undone or the remaining mass after the mass has detached Increasing the arc length can be reduced by reducing the pulse width or by increasing the pulse period to reduce the pulse lifting force. Thus, the growth rate of the molten mass can be controlled, so that the generated arc length can be suppressed to a predetermined value or less, and good welding can be obtained. There is an effect that a uniform beat can be obtained by repeating the detachment.

Further, according to the tenth aspect, at least one of a plurality of pulse currents having at least one pulse width and a pulse beak value has at least a pulse interval or a pulse width or a pulse width. One of the cycles, A pulse current group arranged in a distributed manner by changing the pulse current at a preset time after the start of pulse transmission of the pulse group, and the pulse current group described above are periodically repeated. It is characterized by having a discharge current waveform formed by superimposing a continuous base current on it, so there is no need to detect detachment, and the detachment detector can be used. Erroneous control due to the detection miss is also eliminated, and the remaining molten mass after the molten mass has detached at the estimated detachment time is lifted up by the pulse. The longer the arc length, the longer the pulse interval by extending the pulse interval to return the lifted molten mass to its original state, or the molten mass is detached. The remaining molten mass is lifted up by the noise and the pulse width is increased until the arc length becomes longer. It is possible to control the growth rate of the molten mass by reducing the lifting force by the pulse by increasing the pulse period and by increasing the pulse period. The effect that the generated arc length is suppressed to a predetermined value or less and good welding can be obtained, and at the same time, a regular molten mass is repeatedly separated to obtain a uniform bead. There is

According to the eleventh aspect, an arc current consisting of a pulse current is supplied between the welding wire electrode fed to the workpiece and the workpiece, The molten mass grown at the tip of the welding wire electrode is transferred to a welded portion to perform welding, and the molten mass at the ^ c end of the object to be welded is caught. A detachment detector for detecting the detachment and outputting a detachment signal; and forming a pulse current as the arc current, and forming the pulse current. A gradient of the level change is provided for the bi-beak value from the predetermined rise level of the flow, and the fall from the beak value is synchronized with the departure signal input. And a pulse current waveform control circuit is provided so as to provide a gradient of the level change with respect to the current level, thereby providing an electromagnetic pin for the pulse arc discharge. In order to suppress the delay of detachment of the molten mass, the pulse current is increased during the growth of the molten mass formed at the tip of the wire again after the detachment of the molten mass is always confirmed. Acts to suppress the lift of the molten mass due to the value, and the delay of the molten mass to be separated has less effect on the separation in the next pulse group, and the fluctuation of the separation time is suppressed. As a result, a high quality weld bead can be obtained and stable welding can be performed. There Ru.

 Further, according to the 12th invention, in addition to the 1st invention, the charge amount of the arc current supplied to the detachment detector of the molten mass is specified, and the detachment detection signal is also provided. A means for measuring the charge amount of the pulse current from the time of synchronization.If the measured charge amount and the specified charge amount become substantially constant, the pulse current is stopped. An arc current feed control unit that resets the means for measuring the amount of charge and controls the feed of the arc current is provided, and the molten mass caused by the magnetic blowing phenomenon is provided. In addition to preventing irregular detachment, the melting capacity of the molten mass in each cycle is secured, the detachment cycle is performed regularly, and good arc welding can be performed.

According to the thirteenth invention, in addition to the first and second inventions, A short-circuit / arc detector that outputs a short-circuit signal when judging a short-circuit to a workpiece to be welded and outputs a detachment signal when judging that short-circuit melting rose has separated is provided. The pulse current value is controlled according to the arc length signal corresponding to the shape change, and the pulse width during the arc period is increased or decreased according to the growth of the molten mass or the shape change. The pulse period or the pulse interval is controlled, and the amount of charge of the pulse current supplied during the arc period after the molten mass is separated is determined. Means for measuring the charge amount at the time of separation judgment or from the separation time at the above-mentioned separation detector.If the measured charge amount and the specified charge amount become substantially constant, the above-mentioned arc current will be measured. And reset the means for measuring the charge amount. And an arc current supply control unit that controls the supply of the arc current. In addition to preventing irregular short-circuiting of the molten mass, the molten mass can be secured during the arcing period of the molten mass, the short-circuiting cycle can be performed regularly, and good short-circuit transition welding can be performed. In addition, there is an effect that welding combining pulse arc welding and short-circuit transfer arc welding can be performed, and an effect that the range in which optimum welding can be performed is widened.

 BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a block diagram showing a pulse welding apparatus according to an embodiment of the first invention, and FIG. 2 is a circuit showing an embodiment of a pulse envelope M i setting device of the invention. Fig. 3 shows an example of this invention. FIG. 4 is a pulse group current waveform diagram according to the embodiment, FIG. 4 is a pulse group current waveform diagram showing another embodiment of the first invention, and FIGS. 5 (a) to 5 (d) are diagrams of this embodiment. FIG. 6 is a waveform diagram illustrating a pulse modulation method to be used, and FIGS. 6 to 8 illustrate another embodiment of the second invention. FIG. 6 corresponds to FIG. 7 and 8 are single pulse current waveform diagrams, FIG. 9 is a configuration diagram showing a pulse welding apparatus according to an embodiment of the third invention, and FIG. Fig. 9 Circuit diagram of pulse cycle CA setting unit, Fig. 11 shows the operation timing chart in Fig. 10 circuit, Fig. 12 explains the operation and effect of Fig. 9 configuration FIG. 13 is a circuit diagram according to another embodiment corresponding to FIG. 10, FIG. 14 is a configuration diagram illustrating a pulse welding apparatus according to one embodiment of the fourth invention, Fig. 15 shows Fig. 14. FIG. 16 is a circuit diagram showing an embodiment of the pulse width setting device shown in FIG. 16, FIG. 16 is a diagram corresponding to FIG. 12 according to the fourth invention, and FIG. 17 is a diagram showing an embodiment of the fifth invention. FIG. 18 is a diagram showing a pulse welding apparatus according to an embodiment of the fifth invention, and FIG. 19 is a diagram showing a pulse welding apparatus according to an embodiment of the sixth invention. FIG. 20 is a circuit diagram of the pulse envelope Mi setting unit shown in FIG. 19, FIG. 21 is an operation waveform diagram of each unit in FIG. 20, and FIGS. 22 and 23 are FIG. FIG. 19 is an explanatory view showing the effect of the sixth embodiment of the invention, and FIGS. 24 (a) to (d) show the pulse modulation of the sixth embodiment in the same manner. FIG. 25 is a waveform diagram illustrating the system, FIG. 25 is a block diagram corresponding to FIG. 19 illustrating one embodiment of the seventh invention, and FIGS. 26 (a) and (b) are FIG. 27 is an explanatory diagram of a pulse group waveform when applied to a short-circuit transfer arc welding device. FIG. 27 is a configuration diagram showing a pulse welding device according to an embodiment of the eighth invention, and FIG. The circuit diagram of the pulse period _CΑ setting unit shown in Fig. 29, the operation timing chart in Fig. 29 and Fig. 28, and Fig. 30 explain the operation and effect of Fig. 27. FIG. 31 is a circuit diagram according to one embodiment of the ninth invention corresponding to FIG. 28, and FIG. 32 is a pulse welding apparatus according to one embodiment of the first Q invention. a block diagram illustrating, FIG. 33 No. 32 Contact Keru circuit arc length detector diagram shown to other embodiments in the figures, FIG. 34 Pulse period C _a setter that only you to an embodiment of this FIG. 35 is an operation timing chart of the circuit in FIG. 34, FIG. 36 is a waveform diagram illustrating the operation and effect of the configuration in FIG. 32, and FIG. invention FIG. 38 is a circuit diagram showing a pulse cycle CA setting device shown in FIG. 37, and FIG. 39 is an operation in a circuit shown in FIG. 38. FIG. 40 is a waveform diagram illustrating the operation and effect of the configuration shown in FIG. 37, and FIG. 41 is an overall pulse welding apparatus according to an embodiment of the twelfth invention. Fig. 42 is an internal configuration diagram of the arc length signal detector and pulse group waveform gradient setting device, Fig. 43 is an arc voltage-current characteristic diagram for explaining the arc length detection operation, and Fig. 44 is FIG. 45 is a signal waveform diagram for explaining the operation of this embodiment, FIG. 45 is a block diagram of a pulse welding apparatus according to another embodiment of the present invention, and FIG. 46 is a pulse diagram of one embodiment of the thirteenth invention. 47 (a) to (c) show the overall configuration of the screw welding apparatus. Fig. 48 (A) is an overall configuration diagram of a short-circuit transition type arc welding apparatus according to an embodiment of the fourteenth invention, and Fig. 48 (B) is a short-circuit arc. FIGS. 49 (A) and (B) are diagrams showing the configuration of the judgment device, and FIGS. 49 (A) and (B) are arc current waveform diagrams for explaining the operation of the embodiment of the short-circuit transfer type arc welding apparatus shown in FIG. 48. ) And) are configuration diagrams showing other embodiments of the invention, respectively. FIG. 51 is a pulse waveform diagram for explaining these other embodiments, and FIG. Arc length detection circuit and detachment ♦ Diagram showing the configuration of the short-circuit detector. Fig. 52 (b) is a waveform diagram illustrating the operation of the detachment / short-circuit detector. Fig. 54 (b) is a block diagram of a conventional arc welding apparatus of a short-circuit transfer type, and Fig. 54 (a) is an arc current waveform diagram for conventional arc welding. (B) Arc current waveform diagram during short-circuit transfer welding, Fig. 55 (a). (B) Schematic diagram of conventional pulsed arc discharge current waveform and molten mass transfer, Fig. 56 Fig. 57 is a pulse arc current waveform diagram of a conventional pulse arc welding device, and Fig. 58 is a molten mass generated by the magnetic blowing phenomenon. Fig. 59 shows the current waveform diagram of the conventional short-circuit transfer type arc welding.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a pulse welding apparatus according to an embodiment of the first invention will be described with reference to the drawings. FIG. 1 is an overall configuration diagram of the apparatus of this embodiment. In the figure, (1) indicates the inverter drive circuit. Inverter circuit section driven and controlled by the path (2), (3) High-frequency transduction, (4A) and (4B) are high-frequency diodes, and (5) is welding Torch (51), wire electrode (52), wire from filler metal and wire discharge (53), arc discharge (53) and workpiece In the arc load section composed of (54), the desired pulse group current waveform i controlled by the inverter from the inverter circuit section (1) is converted to a high-frequency transformer (3) and a high-frequency pulse. It is supplied to the welding torch (51) via the diodes (4A) and (4B), and arc welding is performed.

Also, (6) a current detector for detecting the pulse group current, (7) a voltage detector for detecting the voltage between the electrodes, and (8a) a pulse detector for detecting the pulse group current i. A pulse current for controlling the waveform of a pulse current output by controlling the inverter circuit section (1) based on a current value detected by the current detector (6) to be detected. the waveform control circuit indicates, pulse current waveform control circuit of this (8), pulse waveform shaper (81), the pulse group cycle C _B was depending on Wa Lee ya feed speed V _w set to that pulse group period C _B setter (82), pulse group period X setter (83), pulse group waveform Mi setter (84), setter Te pulse width (85) and pulse Equipped with a period C _A setting device (86), and outputs a pulse group current whose waveform is shaped by a pulse waveform shaper (81) that receives setting signals from each setting device Is Do Ni Let 's that, is La, the adder (87) by Ri-based current I _B output device in (88) or al the base current I _B and the pulse group current and superimposed to comparators output (89) and this ratio The comparator (89) compares the pulse group current waveform from the current detector (6) with the set pulse group current waveform output from the adder (87). It sends out the 0N-0FF command to the inverter drive circuit (2). Na Contact, (9) and (10) controls the word i catcher feed紿速degree based on the set speed value Wa Lee turbocharger feed speed V _w Wa Lee turbocharger feeding speed V _w setter to set a its This is a feeder.

In here, the pulse group waveform Mi setter (84), the Pulse group cycle C _B setter (82) or these Pulse group cycle C _B signal and Pulse group period X setter Based on the input of the pulse group period X signal from (83), a mountain-shaped envelope signal of the pulse group current i to be output to the arc load section (5) is set. Fig. 2 is provided as an example of a typical circuit.

Match for to Chi, Remind as in Figure 2, full Clip off you sends a H signal to the Pulse group period by entering the pulse group period C _B signal and pulse group period X signal b -up (84 a), pulse group transmission start or et pulse bicycloalkyl over time until it reaches the click value, one or Ri withdrawal of the aforementioned molten mass. Bo to set the time T _c Li Timer (84c) that operates based on the set value by the unit (84b), and an operational amplifier (84d) that amplifies the output of the flip-flop (84a) When the output of this op amp rises, the resistors (84e) and (84m), which constitute the charging circuit when the output rises, and the capacitor (84f) and the capacitor 4f) discharge when the output falls. The resistors (84g), transistor (84h), (84i), (84j), and inverting It has a fan (84k) and an inverting circuit (841). Na us, and the resistance value of the resistor ⁽⁸ 4e) and) their respective R _2, and, co down de when the capacity of the emissions Sa (84I) and is C, the charging time constant Ri C "R It is selected to be ₂ C.

If it described with reference to the generation of Pulse envelope Mi chevron shape Ru good in the pulse group waveform setting unit (84), or not a pulse group period C _B setter (82) or these pulse group periodic signal is input to the cell Tsu preparative terminal S of the full Clip off Lock Bed ⁽⁸ 4a), pulse group period X setter (83) or these pulse group period X signal off Li Tsu By being input to the reset terminal R of the flip-flop (84a), the flip-flop (84a) becomes an H signal during the pulse group period Output signal. The output signal of the flip-flop (84a) is input to an operational amplifier (84d), a timer (84c), and an inverting buffer (84k). When entered Ru on operations A down-flop (84d), the Pulse group cycle C _B signal resistance (84m) and co emissions Devon Sa (84f) in such that the charging circuit by Ri pulse current at the time of application to the Ku fin-click the lowest pulse Bee rather than generate all the current I _P of the molten mass - IB a converted mark has been integral output charging instantly cormorants by Ru to pressure, resistance (84 e) and co-down Devon The value integrated up to the _Tc time set in the timer (84c) is superimposed by the charging circuit of the circuit (84 °), and when the time reaches the _Tc time, the transistor (84c) When 84j) and (84h) are turned on by the timer (84c), the output signal of the operational amplifier (84d) is attenuated via the resistor (84g), and When the flip-flop (84a) becomes an L signal, the inverted buffer (84k) is activated. The signal becomes the H signal, the transistor (84i) is turned on, and the output signal of the operational amplifier (84a) immediately becomes zero. The output signal of this operational amplifier (84a) is inverted by an inverting circuit (84U), and the chevron-shaped envelope signal is output to a pulse waveform shaper (81).

Next, the operation of this embodiment will be described with reference to the waveform diagram shown in FIG. In the figure, T _A is a pulse interval in the pulse group period X, and T _B is a repetition interval in the pulse group period X. Also not a, Pulse group cycle C _B setter (82), Pulse group period X setter (83), Pulse group waveform Mi setter (84), set Joki (85 Te Pulse width ) and Pulse period C _A setter (86) or al its Rezorepa ls e group period CB signal, Pulse group period X signal, Pulse group waveform (envelope) M i signal, Pulse The pulse width signal and the pulse period CA signal are sent to the pulse waveform shaper (81).

Pulse waveform shaping circuit (81) is to synchronize the pulse group periodic signal, pulse width Te, pulse period C _A also One of Kakupa pulse signal Pulse beak value Pulse envelope of M i their Re respectively determined above, you shaping up Symbol Pulse group cycle C _B signal and the intermittent Pulse group waveform shown in FIG. 3 Ri by the Pulse group period X signals. Et al is, you shaping the base current I _B output unit (88) or these base current I _B signal waveform obtained by superimposing a DC current I _B in the intermittent Pulse group waveform. This shaped pulse current signal and the current signal detected by the current detector (6) are input to the inverter drive circuit (2) to be shown in Fig. 3. The pulse arc current waveform i The corresponding inverter drive signal is transmitted from the inverter drive circuit (2) to the inverter circuit section (1), and drives the inverter.

 By this drive, a shaped AC waveform is output to the high-frequency transformer (3). Furthermore, by rectifying the output signal of the high-frequency trans- former (3) into a DC waveform by using the high-frequency diodes (4A) and (4B), the signal shown in Fig. 3 can be obtained. Loose arc current waveform i is supplied to the weld, that is, the arc load (5).

 In the arc load section (5), the wire electrode (52) is continuously supplied by a motor (not shown) simultaneously with the supply of the pulse arc current waveform i. Therefore, a pulse arc discharge (53) is generated between the wire electrode (52) and the workpiece (54) according to the pulsed arc current waveform i, and the workpiece (54) And the tip of the wire electrode (52) is melted by pulse arc discharge (53). Welding is performed by continuously dropping the molten portion of the wire electrode (52) onto the molten portion of the workpiece (54). Therefore, the wire electrode (52) is naturally consumed continuously. The wire electrode (52) is continuously fed to the welding torch (51) by the above motor to compensate for the consumption.

Were it to Tsu, by the above-described embodiments lever periodically Te predetermined pulse width, Wa in synchronization with the I Ri pulse groups and this flowing pulse group Aku current period C _A i ya The molten mass formed on the electrode is generated by the arc discharge current corresponding to the pulse frequency of the pulse group. Wire melting and constriction phenomena are caused by the fusing arc heat and the binding force. In other words, the growth of the molten mass is promoted to facilitate the detachment. After the molten mass has detached, a new molten mass is formed and grown again at the tip of the wire electrode by the pulse group. Subsequently, during the base period, the molten mass at the tip of the lifted wire hangs down, and plays a role in adjusting the shape of the molten mass by the start of the next pulse group, thereby growing the molten mass. And a regular repetition of withdrawal. Furthermore, in order to regularly release the molten mass of the wire electrode, the release time Tc from the start of application of the pulse group is determined in consideration of the fluctuation of welding conditions and the influence of disturbance. The pulse beak value of the pulse group becomes maximum near the time _Tc, and a new molten mass that occurs after the molten mass is detached is lifted. The peak value of the pulse group is reduced after the elapse of the Tc time to suppress the noise, so the electromagnetic pulse of the pulse arc discharge is high in the part where the pulse peak value is high. It is possible to ensure that the molten mass is released with the maximum force. Also, since the pulse current waveform is composed of a plurality of pulse currents, and this pulse current group is a discharge current waveform that repeats periodically, one pulse is composed of a plurality of pulse currents. As a result, the upward electromagnetic force of the pulse arc discharge at the wire electrode is intermittent due to the division of the pulse current waveform. Therefore, it acts to reduce the force for lifting the molten mass formed at the tip of the wire electrode. Therefore, the atmosphere gas is Not a all these Le down main gas, C 0 ₂ molten mass Oite also formed at the tip of the word i catcher electrode gas you disengaged easily previously ing and Daikatamari.

In addition, as for the separation time _Tc in the above embodiment, it is needless to say that an optimum separation time can be selected according to the welding conditions such as the electrode diameter and the atmospheric gas.

Further, in the above embodiment, as shown in FIG. 3, the pulse group waveform is gradually increased as the pulse group waveform, and the peak value is decreased after the time Tc. As shown in Fig. 4, the peak beak value of the pulse only around the time _Tc may be increased as shown in Fig. 4.

 Further, in the above embodiment, the pulse group waveform shown in FIG. 5 (a) uses the pulse amplitude modulation, but the pulse group modulation shown in FIG. 5 (b) is used. Alternatively, the one obtained by one of the pulse frequency modulations shown in FIG. 3 (c) can be used, and in any case, the waveform obtained by the pulse frequency modulation shown in FIG. After the set time, the average current should be the maximum beak value as shown in Fig. 5.

 Next, in the embodiment, the pulse arc welding apparatus using the pulse group waveform was described. However, as shown in the second invention in FIGS. 7 and 8, a single pulse welding apparatus was used. Pulse welding equipment that performs periodic repetition of the pulse current waveform may be used.

That is, FIG. 6 relates to the second invention in which the pulse current waveform shown in FIG. 7 is obtained and pulse arc welding is performed. That also shows an embodiment of a pulse welding equipment of the, in the figure the first figure and the same reference numerals indicates the same parts, single Pulse generation bus ls e waveform Mi setter (84 _2), pulse width τ setter (85 ₂₎ and pulse period C _a setter (86 ₂₎ of rather good if the Let 's you sends the settings input pulse waveform shaper (81), the is a circuit configuration of the pulse waveform set Joki (84 ₂₎ have good the same configuration as Figure 2. In this case, the input and to may be be given instead each pulse period C _A and pulse width Ri τ of pulse groups period CB and the pulse group duration X.

Also in this embodiment, as in FIG. 1, the current value becomes the beak value after the set time Tc, so that the pulse arc discharge is increased at the portion where the pulse beak value is high. electromagnetic bins Chi force Ri is is max, the but One and that Ki out and this that Ru is disengaged reliably soluble Torukatamari at high T _c times of pulse beak value. The single pulse in FIG. 8 may be used instead of the single pulse in FIG.

In each of the above embodiments, welding using a mixed gas of argon and CO ₂ gas as the atmosphere gas (shield gas) may be used, and the same effects as those of the above embodiments can be obtained.

FIG. 9 shows an embodiment of the third invention. Note that the pulse current waveform control circuit (8) in the thick embodiment includes a pulse group charge amount Q setting device (90) in the pulse current waveform control circuit (8) shown in FIG. The pulse waveform shaper (81), which receives the setting signal from each setting device, outputs a pulse current group whose waveform has been shaped. Et al, the output to this pulse current group to the adder (87) to by Ri-based current I _B output unit (88) or al output Ru base current I _B superimposed and the specific較器(89) The comparator (89) compares the pulse current group waveform from the current detector (6) with the set pulse current group waveform output from the adder (87). Then, an ON-OFF command to the inverter drive circuit (2) is transmitted. Na Contact, (9) and (10) to control the follower Lee Ya feed rate on the basis of the set speed value Wa Lee Ya feed rate Vw setter and its to set the word i ya feed rate V _w (11) is an average voltage V setting device for setting an average voltage V corresponding to the arc length.

Here, the pulse group charge amount Q setting device (90) includes an integrator (90a) for integrating the pulse current group output from the pulse waveform shaper (81), and an average voltage V setting. Charge setter (90b) in which the amount of charge is set according to the average voltage V sent from the integrator (11), the integrated value of the integrator (90a) and the charge amount setter (90b ) And the reset signal is sent to the integrator (90a) and the pulse group period X setting unit (83) when the integrated value reaches the set charge amount. The pulse number in the pulse group period X to maintain the regularity in the growth and detachment of the molten mass even if the pulse period CA is variable. It has been done. Note that the pulse group period X setter (83), which is a flip-flop reset based on the output of the pulse group charge Q setter (30), is Luz group circumference In synchronization with the output transmission phases C _B setter (82) is Se Tsu Bok.

Also, the pulse period C _A setter (86), depending on the Re this-out based on the input of the word i ya feed紿速degree V _w setter (9) or these set speed V _w Pas the pulse period C _a in the pulse group period X Ru is also variable to a, that have e Bei the first 1 Q diagram constructed by a concrete circuit example of that.

That is, as shown in Fig. 10, it operates based on the input of the pulse group periodic signal, and after the set time _Tc , sends out the H output and resets. output Chi is ing and L Thailand Ma (86 a), Li cell Tsu Bok based on H output cell based on the pulse group period C _B signal Tsu Sorted said Thailand Ma (86 a) The first flip-flop (86b) is set based on the H output of the timer (86a) and is reset based on the pulse group period X signal. Ru is Bok second full Clip off Lock flop (86 c), the first and second pulse period C _{a 1,} C of order the _{a 2} was to set the set value V _B and V _a — The first and second pulse period setting devices (86e) and (86d) that output Vw respectively, and the flip-flops (86b) and (86c) Based on the output Setting of analog switches (86f) and (86g), and the first or second pulse period setting devices (86e) and (86d), which are controlled by switching the value V _B, V _a - sending the H output when it reached the Vw - V _w t ¾ minute output V _Q compares with integral output V _Q is was or V _B V _a of (86 i) to the integrator (86 i) re Se Tsu preparative control to that Pulse period signal H output of its co and CA (CAI, C _{a 2)} and to you output comparators (86h) Yes, above The second pulse period setting device (86d) obtains a differential output V _A — V _w between the setting device (86 da) and its set value V _A and wire feed speed V _w. comprising differentiator with (86dB), Wa Lee ya feed紿速degree V _w is Do Ni Let 's you output as large signal values you decrease, therefore, Wa Lee turbocharger feeding speed Vw is set value When the voltage drops below V _A , the differential output V _A — Vw, which is inversely proportional to the wire feed speed, is increased, and the pulse period C _A is lengthened accordingly. As a result, the pulse pause period (base current period) is lengthened, and the growth rate of the molten mass per unit time is suppressed according to the wire feed rate Vw. Let's go. Note that the set time _Tc of the timer (86a) is such that a pulse current based on the first pulse period signal CA melts the tip of the wire electrode and promotes neck growth. Then, the pulse current based on the _second pulse period signal CA2, which is set to the time until the molten mass is lifted and detached, is set to the next molten mass. It functions to promote the growth of the molten mass and to regularly transfer the molten mass by the next pulse current group.

That describes the generation of the Pulse period C _A setter first and second that by the (86) bus ls e periodic signals C _{A 1,} C _A2 based on Figure 11. Also not a, to enter pulse group period C _B setter (82) or these bars pulse group periodic C _B signal is Se Tsu preparative terminal of the first full Clip off Lock flop (86 b) When both Ri by the and the child to enter into Thailand Ma ⁽⁸ 6a), the first full Clip off Russia-up (86 b) is Se Tsu door, output P _x of that is H-les The analog switch (86f) conducts due to the bell, and the output of the first pulse period setting device (86e) V _B is the comparison input to the comparator (86h). Comparator (86h) is sent to the output when V _Q by comparing the output V _Q output V _B and an integrator (86i) of said first Pulse cycle setter (86e) matches the V _B and, it sent the output Hopa pulse period C _a signal and to the first pulse cycle setter (86 e) in rather based Dzu pulse period C _{a 1} of that. Based on the output of the comparator (86h), the integrator (86i) is reset and starts the integration operation again, and the first pulse period C _A1 signal based on the above-described comparison is obtained. Is repeated.

Next, when the set time _Tc of the timer (86a) has been reached, the first flip-flop (86b) is reset by the timer output. Since the output P _x is at the L level, the ana-port switch (86 f) becomes non-conductive, and is compared with the first pulse period setting device (86e). The comparison input to the vessel (86 h) is cut off. On the other hand, the second flip-flop (86c) is set by the above-mentioned timer output, and its output _PY becomes H level. the output V _a of the goodness Ri Anal log scan I Tsu switch (86 g) and the second Pulse cycle setter is conduction control (86 d) - V _w comparison input to the comparator (86h) It becomes. The comparator (86h) compares the output V _A -V _{W of} the second pulse period setting device (86d) with the output V _Q of the integrator (86 i) to obtain V. Is output when V _A -V _w coincides, and the output is a pulse period signal, and the pulse period C _A2 based on the second pulse period setting device (86d) is used as the pulse period signal. Send it out. Based on the output of the comparator (86h), the integrator (86i) is reset and starts the integration operation again. Repeat pulse ₂ CA ₂ signal transmission.

That is, the pulse period C _A signal generated by the pulse period setting device (86), and the growth and detachment of the molten mass at the tip of the wire electrode during pulse arc welding. The time (86a) is set at the point when the constriction at the boundary between the solid part of the wire electrode and the molten mass is promoted to ensure that the molten mass is released toward the workpiece. During the time Tc, the first pulse period CAI signal with a relatively short period is sent, and the pulse period with a relatively long period is required to maintain the pulse pause period long after leaving. in the this you inhibit the growth rate of the second BALS period CA ₂ a delivery unit time equivalent Ri of molten mass, the lifting Chi above Ri phenomenon new molten mass formed in the word ya electrode portion Melting in the next pulse group so that the growth of the molten mass can be suppressed and Dispersion control is performed by changing the pulse period to make it easier for the lump to separate.

Next, the operation of this embodiment will be described with reference to the waveform diagram shown in FIG. Also not a, pulse group period G _B setter (82), Pulse group Period X setter (83), Pulse group waveform M i setter (84), setter Te Pulse width (85 ) and pulse period C _A setter (86) or al its Rezorepa pulse group period G _B signals, pulse group period X signal, pulse group waveform (envelope) M i signals, pulse width Send τ signals and pulse period C _a signal pulse waveform shaper (81).

Pulse waveform shaping circuit (81) is to synchronize the pulse group period C _B signal, Pulse width Te, One also pulse period CA of Kakupa ls e signal Pulse peak value, respectively Re its a on pulse envelope M i look, intermittent Pulse was shown in FIG. 12 Ri by the upper Symbol pulse group period C _B signal and pulse group period X signal Shape into a waveform. Et al is, you shaping to the base current I _B output unit (88) or these base current I _B signal waveform obtained by superimposing a DC current I _B in the intermittent Pulse group waveform. By inputting the shaped pulse current signal and the current signal detected by the current detector (6) to the inverter drive circuit (2), the pulse signal shown in FIG. 12 is obtained. An inverter drive signal corresponding to the loose arc current waveform i is transmitted from the inverter drive circuit (2) to the inverter circuit section (1), and drives the inverter.

 By driving this inverter, a shaped AC waveform is output to the high-frequency transformer (3). In addition, by rectifying the output signal of the high frequency transformer (3) into a DC waveform with the high frequency diodes (4A) and (4B), the pulse arc shown in Fig. 12 can be obtained. The current waveform i is supplied to the welding part, that is, the arc load part (5), and is then viewed.

In the arc load section (5), the wire electrode (52) is continuously supplied by a motor (not shown) simultaneously with the supply of the pulse arc current waveform i. . Accordingly, a pulse arc discharge (53) is generated between the wire electrode (52) and the workpiece (54) according to the pulse arc current waveform i, and the welding arc is generated. The object (54) and the tip of the wire electrode (52) are melted by pulse arc discharge (53). The melted portion of the wire electrode (52) is melted by the molten material (54). Welding is performed by dropping continuously on the part. Therefore, the wire electrode (52) naturally wears out continuously. The wire electrode (52) is continuously fed to the welding torch (51) by the motor to compensate for the consumption.

In here, the Oite in Example, 12如rather shown, the period G _A is pulse period of the pulse Bas pulse waveform shaper (81) or al the sent pulse group period in X Ru C _a is variably controlled setting device (86) to the I Ri depending on the word i ya feed speed V _w to also as a pulse group period C _B, Wa Lee ya feed speed V _w For example is rather slow as Do that _{(V W 3> V W 2} > Vwi), its second of the pulse period C _{a 2} is controlled Let 's that Do rather than length. In this case, the first pulse period C _A1 signal is always controlled to be transmitted at a predetermined timing. And follow, pulse period Tsu by the pulse period C _A setter (86) is distributed control, built-in to that Thailand Ma (86 a) any ring b catcher set time T _c or the The molten mass at the tip of the wire electrode during pulse arc welding is generated by the pulse current transmitted based on the relatively short pulse period signal GAi, which is fixed even at the feeding speed. In the growth and detachment phenomena, the constriction at the boundary between the solid part of the wire electrode and the molten mass is promoted to ensure that the molten mass is covered at a certain time after the start of the pulse current group. It can be removed to the welded material side.

Then, after the molten mass detaches after the set time Tc of the timer (86a), the molten mass is newly lifted to the tip end of the wire electrode again by the pulse group. Grew and then During the base period, the molten mass at the tip of the lifted wire hangs down, and the shape of the molten mass is adjusted by the start of the next pulse group, and the molten mass grows and ing to and the child to return Ri regularly click the withdrawal, but the word Lee ya provided with a pulse pause period that inversely proportional to send紿速degree V _w rather than prevent all the changes in the arc length J2, Wa i turbocharger delivery The pulse current sent out based on the relatively long second pulse period C _A2 that is inversely proportional to the velocity Vw causes the lift of the newly formed molten mass at the wire electrode to rise. The following phenomenon can be achieved by suppressing the phenomenon of melting and growing the molten mass, thereby facilitating the detachment of the molten mass in the next pulse group and making the migration regular. Go to. In this case, the second pulse period C _A2 is variably controlled in accordance with the wire feed speed V _w , so that the arc length is undercut. in either case the Flip not permissible arc length L 0 following values ii i ~ J2 ₃ Ru is reliably suppressed.

Also, since the pulse current waveform is composed of multiple pulse currents and this pulse current group is a discharge current waveform that repeats periodically, one pulse is The pulse current waveform is divided, and the upward electromagnetic force of the pulse arc discharge at the wire electrode is interrupted by the division of the pulse current waveform. Since it continues, it acts to reduce the force to lift the molten mass formed at the tip of the wire electrode. Me other of their, atmosphere gas is not a only a Luo gas of A Le Gore-down mainly, C 0 ₂ molten mass, which is formed at the tip of the Wa I turbocharger electrode can have you in the gas is and Daikatamari Become Easily detached before.

In addition, the set time _Tc for dispersively controlling the pulse period CA in the above embodiment _Tc welding ^ "For example, an optimum departure time should be selected according to the electrode diameter and the atmospheric gas. Of course, you can do it.

Also, FIG. 13 than also shows another embodiment of the pulse period shown in FIG. 10 C _A setter (86), a variable resistor first pulse cycle setter to (86e ') composed of a down-flops instead of, and the output V _B of its output V _a of the second pulse period setting device (86 d) - come to a value obtained by multiplying a predetermined amplification factor a to V _w The first pulse period C _A1 is variably controlled similarly to the second pulse period. Ri by the and the child you to jar good of this, depending on the word Lee ya Oku紿speed V _w in period circumference first pulse also C _{A 2} in the same manner as the first pulse period C _{A 1} The control can suppress the arc length variation during the first pulse period. Note that the first pulse period G _A1 is a signal of a transmission timing shorter than the _second pulse period C _A2, and is intended for the growth and detachment of the molten mass. This is a matter of course.

Next, FIG. 14 is a block diagram showing an embodiment of the fourth invention. The pulse current waveform control circuit (8) in this embodiment is different from the embodiment shown in FIG. Ho points that differ from the pulse current waveform control circuit (8), based pulse width setter to (85 i), to the input of the set speed V _w Wa Lee ya feed speed Vw setter (3) or al In response to this, the pulse width within the pulse group period X was varied. As a specific circuit example, the configuration shown in FIG. 15 is provided. (In this embodiment, the pulse cycle CA setting device (86) is dependent on the wire feed speed.) A constant periodic signal is sent.)

That is, as shown in Fig. 15, it operates based on the input of the pulse group period signal, and sends out the H output after the set time _Tc and is reset by resetting. A timer (85a) whose output is L is set based on the pulse group cycle CB signal and reset based on the H output of the timer (85a). The first flip-flop (85b), which is set based on the H output of the timer (85a) and reset based on the pulse group period X signal Set values V _B and V _A -V _W for setting the second flip-flop (85c) to be set, the first and second pulse widths i, and ₂ Based on the outputs of the first and second pulse width setting devices (85e) and (85d), and the flit lobes (85b) and (85c), respectively. Switch Ru is in g Control Analog Selecting scan I pitch (85ί) and (85 g), was first or second pulse width set Joki (85 e), the set value V _B of (85 d) , V _A -V _w and the output V _Q of the integrator (85i), and when the integrated output V _Q reaches V _B or V _A -V _w , an H output is sent out to the integrator. (85i) has a comparator (85h) that resets and controls its H output and outputs it as a pulse width signal (i, r2). and (a contact, an integrator (85 i) is set to have groups Dzu to the input of Pulse periodic signals C _a, Ru is Li cell Tsu Bok and have groups Dzu the output of the comparator (85 h) Analogue that is controlled to open by the output of the flip-flop Integral operation is started by opening the switch. ), The second pulse width setting device (85d) is a differential output V _A between the setting device (85 da) and the set value V _A and the feeder feeding speed V _w — a differential device to obtain a V _w the (85db), Wa Lee ya feeding speed V _w is Do Ni Let 's you output has a significant signal value as you decrease, and follow, sent word Lee ya When the speed V _w drops below the set value V _A , the differential output V _A — Vw, which is inversely proportional to the wire feed speed, is set to a large value, and the value is set accordingly. The pulse pause period (base current period) is lengthened by narrowing the pulse width, and the growth rate of the molten mass per unit time according to the wire feed speed Vw Are controlled. The set time Tc of the timer (85a) is the first pulse width signal ΤΓ! Is set to the time until the tip of the wire electrode is melted by the pulse current based on the above, and the growth of the constriction is promoted so that the molten mass is lifted and separated. The pulse current based on the _second pulse width signal sent after that promotes the growth of the next molten mass and regularly moves the molten mass by the next pulse current group. It works like it does.

According to the configurations of FIGS. 14 and 15, as shown in FIG. 16, the pulse of the pulse within the pulse group period X sent from the pulse waveform shaper (81) is obtained. width Te is also variably controlled and by Ri Wa Lee catcher feed紿速degree Vw response Ji in the pulse group period C _B to setter (85) Te pulse width, sheet speed feeding follower Lee ya Invite example example V w is slow rather about that Do _{(Vw 3> V W2> Vw} !), the second of the pulse width τ ₂ of the Soviet Union that are controlled Let 's that Do rather narrow. In this case, the first pulse width i The signal and pulse period CA are always controlled at a fixed timing. Therefore, in this embodiment, in the above-described embodiment according to the first invention, the pulse interval is dispersed in accordance with the wire feed speed, and the pulse interval is dispersed in the pulse group. In contrast to controlling the growth rate of the molten mass in accordance with the wire feed speed by suppressing the amount of charge injected by the pulse current per unit time of As shown in the figure, by changing the pulse width in the pulse group according to the wire feed speed, the injection by the pulse current corresponding to the potential time in the pulse group is performed. The same effect can be obtained by suppressing the charge amount.

Next, FIG. 17 is a block diagram showing an embodiment according to the fifth invention. The pulse current waveform control circuit (8) in this embodiment is the same as that shown in FIG. 9 and FIG. 0 Figure eXAMPLE pulse period C _a setter (8 6) and pulse width Te setter (8 5) both also of the Ru Oh painting Bei of.

 According to this FIG. 17 embodiment, as shown in FIG. 18, the pulse width τ in the pulse group is represented by τ i in accordance with the wire feed speed.

X 2, and the pulse period C _A to CA i and C _{A 2} (pulse J ^ stop period T _A to TA i and TA ₂ ) By suppressing the amount of charge injected by the pulse current per unit time in the above, the same effects as in the above-described embodiments can be obtained.

FIG. 19 is a block diagram showing a pulse welding apparatus according to one embodiment of the sixth invention. In the figure, the same symbols as in Fig. 14 are the same. -, Or indicates a substantial part. In the figure, (84 J is a pulse group waveform Mi setting device in the present embodiment.

In addition, the pulse current waveform control circuit (8) in the present embodiment has more than the pulse group charge amount. Uz Bed full b Uz blanking a such that pulse group period X set Joki (83) is pulse group period C _B setter of Na in earthenware pots by Ru is Se Uz bets in synchronism with the output transmission (82) The analog switch (91) provided between the nodal group waveform Mi setter (84!) And the pulse waveform shaper (81) is opened and closed by the output. It controls the output transmission of the pulse group waveform Mi setter (84).

The pulse group waveform M i setting device (84 i) sets the pulse group period X signal from the pulse group period X setting device (83) and the feed rate V _w vessel (9) or these set speed V _w and the average voltage V setting device (11) or these settings § over click load portion based on the input of the voltage V (5) to be that pulse group current i output The configuration of FIG. 20 is provided as a specific example of a circuit for setting a mountain-shaped envelope Mi signal.

 That is, as shown in FIG. 20, this pulse group waveform setter (84t) is a reference pulse group waveform setter (84A) that obtains a mountain-shaped reference pulse group waveform P. And a pulse group waveform gradient variable device (84B) and an adder that change the gradient of the chevron shape with respect to the reference pulse group waveform P according to the wire feed speed Vw and the average voltage V. (84 C).

The reference pulse group waveform setting device (84A) Operates based on the time from the start of the group transmission to when the pulse beak value is reached, that is, the set value by the volume (84Aa) that sets the molten mass separation time _Tc The pulse (84Ab), the pulse group period, an amplifier (84Ac) that amplifies the X signal, the resistor (84Ad) that constitutes the charging circuit when the output of this amplifier rises, co-down Devon Sa (84Ae), co-down Devon Sa ⁽⁸ 4Ae) and resistance that make up the discharge circuit when the output is lowered to the co (84Αί), door run-g is te (84Ag), (84Ah), (84Ai), inverting buffer (84Aj), volume unit (84Ak) that obtains additional output at output rise, power calculator (84A J2) and transistor (84Απι) Yes.

In addition, the pulse group waveform gradient variable unit (84B) is an integrator that integrates the pulse group period X signal and outputs the signal _x .

(84B a), Wa I catcher feed紿速degree V _w and the average voltage § emissions Bed (84 B b) you sending the amplified signal Y by adding the voltage value of their being found based on the input and V, the When the signal X has a value equal to the signal Y, the comparator (84Bc) that sends out the signal Z is set based on the pulse group period X signal and sends out the signal S. In both cases, a flip-flop (84B, a resistor Ri and a capacitor C) is reset based on the output signal Z of the comparator (84Bc). Ri in the signal S and the charging circuit CI charge the enter the resistor R ₂ and the co emissions Devon Sa and C at a discharge circuit CR ₂ and the resistor R ₃ you discharge-than output co emissions Devon Sa C comprising a charging circuit CR ₃ you charged again by entering the Do Ri after discharge signal T, have a a down-flop (84 B e) that issues sending the signal V Ru changing the gradient, the reference pulse group waveform Constant The output signal V of the pulse group waveform gradient variable device (84B) is added to the reference pulse group waveform P sent from the device (84A) by the adder (84C) to obtain the signal Mi. It is made.

 The generation of the pulse envelope Mi of a mountain shape for variably controlling the gradient by the pulse waveform Mi setting device (84) will be described with reference to the waveform diagrams of each part in FIG.

First, when the pulse group period X signal is input to the reference pulse group waveform setter (84A), the timer (84Ab) is set based on the pulse group period X signal. At the same time, the amplifier (84Ac) is connected to the timer (84c) by the resistor (84Ad) and the capacitor (84Ae) and by the volume (84Aa). the set was integral in T _c at the time or, T door La and it reaches to the _c-time emissions g is te (84Ah) and is Tsu Do the oN state Ri by the Thailand Ma ⁽⁸ 4c) a down-flops ( the output signal of ⁸ 4d) are you to best match the attenuation in the resistor (84Ac). Further, when the X signal becomes the L signal during the pulse group period, the inverting buffer (84Ag) becomes the H signal, and the transistor (84Ag) is turned on. the output signal of the a down-flop ⁽⁸ 4 Ac) to ing to zero. The output signal of this fan (84Ac) is added to the output of the volume (84Ak) by the adder (84AJ2) until the time Tc. The chevron-shaped signal is supplied to the adder (84e).

- How, pulse group waveform gradient variator ring have contact in (84B) Lee Ya feed speed V _w and the average Ru receives the voltage V § emissions Bed (84Bb) adds the voltage value of their being found The integrator (84 Ba), which inputs the pulse group period X signal, obtains the signal Y amplified by The signal x is obtained and compared by the comparator (84Bc). When the signal X has a value equal to the signal Y, the signal Z is transmitted. The integrator (84Ba) is reset by this signal Z, and its output X instantaneously goes to zero. At the same time, the integrator (84Ba) is reset by the pulse group period X signal. The dropped free probe (84Bd) is reset and its output S becomes zero. In addition, the fan (84Be) that receives the input of the output signal S of the flip-flop (84Bd) is charged in synchronization with the input of the pulse group period X signal. Ri Do the雩discharged Ri by and starts charging Ri by the circuit CR _t off Li Tsu blanking off Lock Breakfast (84 b d) is Ru is Bok Li cell Tsu in the discharge circuit CR _2, Thailand Ma ⁽⁸ 4Ab) inverted signal U of the set time T _c to reach that the father of the output signal T is charged inputted again Ri by the charging circuit CR ₃ accepted that the pulse group period X signal of the H level At a certain moment, a signal V that becomes the same is obtained.

 Accordingly, the adder (84c) adds a signal obtained by adding the output signal V of the pulse group waveform gradient variable device (84B) to the output P of the reference pulse group waveform setting device (84A). Thus, this chevron-shaped envelope Mi signal is output to the pulse waveform shaper (81).

That is, the pulse envelope M i signal by the pulse group waveform M i setting device (84) is the growth of the molten mass at the tip of the wire electrode during pulse arc welding. At the point when the molten mass constriction is formed, a pulse envelope with a chevron shape is generated so that the electromagnetic pinch force generated by the pulse current is maximized. Constriction at the boundary between the solid part of the wire electrode and the molten mass This promotes the removal of the molten mass toward the work to be welded, and further reduces the pulse group beak value waveform after the removal of the molten mass. The lift-up phenomenon of the formed molten mass is suppressed, and the growth of the molten mass can be performed, so that the molten mass can be easily separated in the next pulse group. Review

Also, the pulse group waveform M i is如shown in FIG. 22 rather, when average voltage V is constant flat, changing the slope depending on the word i ya feed rate V _w to secure the beak value that order, as the slow Wa Lee ya feed speed _{Vw (V W 3 <V W2} <Vwi), Ri Do pulse group period X is rather long (5 ₍₃ rather than X ₂ rather than X!), therefore Wa Lee The growth rate per unit time of the molten mass is suppressed in accordance with the feed speed Vw, and the generated arc length is set to the allowable value J¾. It can be prevented from occurring.

Similarly, as shown in FIG. 18, the gradient of the pulse group waveform Mi is made slower as the value of the average voltage V increases with the beak value fixed. (V ₁ > V ₂ > V ₃ ) Thus, the upward electromagnetic force generated by the arc current changes the beak value itself of the pulse current group waveform. Therefore, it is possible to reduce the relaxation as compared with the case in which the arc is generated. Therefore, in this case, the allowable arc length is also set. The following can be suppressed to prevent the occurrence of undercuts.

Next, the operation of this embodiment will be described. First, the 19th In Fig, pulse group period C _B setter (82), pulse group waveform Mi setter (84 i), setter Te pulse width (85) and pulse period C _A setter (86) or Luo Su Rezorepa pulse group period C _B signal, that sent to pulse group waveform (envelope) Mi signal, pulse shaper pulse width Te signals and pulse periodic C _a signal (81) . During this, based on the unfavorable Tsu Bed off Lock blanking a such that Pulse group period X setter (83) is pulse group periodic signal that will be set depending on the word i turbocharger feed rate V _w The pulse group is set so that it is reset based on the output of the pulse group charge amount Q setting unit (90). ) Is configured to transmit an output based on the pulse group cycle signal.

Pulse waveform shaping circuit (81) is to synchronize the Pulse group cycle C _B signals, pulse width Te, Pulse Bee click value also One Kakupa ls e signal Pulse period C _A Are respectively obtained on the pulse envelope M i, and are shaped into, for example, an intermittent pulse group waveform shown in FIG. Et al is, base current I _B output unit (88) at or these base current I _a signal you integer form a waveform obtained by superimposing a DC current IB to the intermittent Pulse group waveform. By inputting the shaped pulse current signal and the current signal detected by the current detector (6) to the inverter drive circuit (2), the inverter drive signal is generated. It is transmitted from the inverter drive circuit (2) to the inverter circuit (1) and drives the inverter.

By driving the inverter, a shaped AC waveform is output to the high-frequency transformer (3). In addition, high-frequency By rectifying the output signal of the lance (3) into a DC waveform by using high-frequency diodes (4A) and (4B), the pulse arc current waveform i is changed to a welding portion or arc load. Supply to section (5).

 In the arc load section (5), the wire electrode (52) is continuously fed by a motor (not shown) simultaneously with the supply of the pulse arc current waveform i. . Accordingly, a pulse arc discharge (53) is generated between the inductor electrode (52) and the workpiece (54) according to the pulse arc current waveform i, and the workpiece ( 54) and the tip of the wire electrode (52) are melted by pulsed arc discharge (53). Welding is performed by continuously dropping the molten portion of the wire electrode (52) onto the molten portion of the workpiece (54). As a result, the wire electrode (52) naturally wears out continuously. The wire electrode (52) is continuously fed to the welding torch (51) by the above motor to compensate for the consumption.

Therefore, according to the above-described embodiment, the pulse group is periodically synchronized with the pulse group by flowing a pulse group arc current with a predetermined pulse width and in synchronization with the pulse group. The molten mass formed on the electrode grows due to the arc current of the pulse group, and the molten mass is constricted by an electromagnetic force corresponding to the pulse frequency. It is further promoted by the lubrication to release the molten mass. After the molten mass has detached, a new molten mass is formed again at the tip of the wire electrode by the pulse group, and the formed molten mass is formed while being lifted up with a pulse. Grows and subsequently melts the lifted wire tip during base current IB The lump hangs down and shapes the molten lump before the start of the next pulse group, so that the growth and detachment of the molten lump are repeated regularly. And In order to make the molten mass detach regularly, the detachment time _Tc from the start of application of the pulse group is determined by considering the fluctuation of welding conditions and the influence of disturbance. The pulse peak value of the pulse group is set to the maximum value around the time Tc, and the lift of a new molten mass that occurs after the molten mass separates is determined. The peak value of the pulse group is lowered after the elapse of the Tc time in order to suppress the discharge, and the electromagnetic arc of the pulse arc discharge is increased in the portion where the pulse peak value is high. With the maximum force, the molten mass can be reliably separated. Also, since the pulse current waveform is composed of a plurality of pulse currents and this pulse current group is a discharge current waveform that repeats periodically, one pulse consists of a plurality of pulse currents. As a result of this division of the pulse current waveform, the upward electromagnetic force of the Norse arc discharge at the wire electrode is intermittent. Therefore, it acts to reduce the force for lifting the molten mass formed at the tip of the wire electrode. Me other its atmosphere gas is not a only a et of gas of A Le Gore emissions mainly, C 0 ₂ molten mass Oite also formed at the tip of the word i ya electrode gas that Do and Daikatamari It will be easy to leave before. Et al is, rather如shown in the second 2 figures and second 3 Figure, the pulse group waveform M i, Bee click value of that was or Wa I turbocharger feed speed V _w depending on the average voltage V Control to change the slope of the waveform while keeping it fixed Accordingly, the arc length between the generated molten mass and the workpiece can be suppressed to an allowable value or less, and the occurrence of undercut can be prevented.

 In addition, as for the separation time Tc in the above embodiment, it is needless to say that an optimum separation time can be selected according to the welding conditions such as the electrode diameter and the atmospheric gas.

Further, in the above embodiment, the pulse group waveform shown in FIG. 24 (a) uses the pulse amplitude modulation shown in FIG. 24 (a), but the pulse width modulation shown in FIG. 24 (b) is used. Alternatively, it is possible to use the one obtained by one of the pulse frequency modulations shown in FIG. (C), and in any case, the same figure (d) It is good if the average current becomes the maximum peak value after the set time as shown in Fig. 4.The beak value is fixed according to the wire feed speed _Vw or the average voltage V. It is only necessary to change the degree of modulation to change the gradient of the average current.

 Next, in the embodiment of the sixth invention described above, the pulse arc welding apparatus using the pulse group waveform has been described, but the single pulse current waveform obtained from the configuration in FIG. 25 is described. It may be a pulse welding device that performs cyclic repetition of the above.

That is, FIG. 25 shows an embodiment of the pulse welding apparatus according to the seventh invention for performing _λ pulse arc welding by obtaining a single pulse current waveform. The same reference numerals as those in Fig. 19 indicate the same parts. Pulse current waveform control circuit in this embodiment that you only (8),单one output of Pulse period C _A setter (8 6 ') The pulse waveform for pulse generation M i (84 ') and the pulse period corresponding to the pulse width X (83') are sent to the set terminals of the set terminal. pulse period C _a setter (86 ') in that consists Ni Let' s you sends the set value of the word i ya feed rate. The circuit configuration of the pulse waveform Mi setting device (84 ') may be the same as that of Fig. 20.

Also in this embodiment, similarly to FIG. 19, the pulse current becomes the beak value after the set time Tc, so that the pulse arc discharge is performed at a portion where the pulse beak value is high. As a result, the electromagnetic force of the magnetic flux is maximized, so that the molten mass can be reliably released at the _Tc time at which the pulse beak value is high, and the wire is also removed. suppress紿速degree V _w or Pulse group waveform depending on the average voltage was, the I Ri arc length and this the beak values Ru changing the fixed or or gradient of that below a predetermined value feeding This can prevent undercuts from occurring.

It is to be noted that each of the above embodiments can be applied even when the wire feeding speed and the average voltage V are both changed. Also, rather good even welding had use a mixed gas of A Le Gore emissions Ho as the atmospheric gas (shield gas) and C 0 ₂ gas, that Sosu the same effects as described above.

In the above series of explanations, the pulse arc welding equipment was described. However, it may be a short-circuit transition arc welding equipment, and the current waveform example in the short-circuit transition arc welding equipment is described in Chapter 26. Figures (a) and (b) show these. In the waveforms of Fig. 26 (a) and (b), the short-circuit period When the transition from short-circuit to arc occurs with the optimal current waveform for short-circuiting the molten mass to the work piece side in the middle, the gradient of the pulse group waveform In the same way as described in the series above, the variation of the short circuit period and the arc period can be reduced by changing the wire feed speed or the average voltage, and a more regular short circuit can be achieved. It has the effect of enabling short-circuit transfer arc welding by repeating the arc.

FIG. 27 is a configuration diagram showing a pulse welding apparatus according to an embodiment of the eighth invention. In the drawing, the same reference numerals as those in FIG. 1 indicate the same or corresponding parts. At the figure, (84 ₂₎ Contact only that pulse group waveform setting unit in this embodiment, Ri Oh at (86 ₂₎ ho pulse period C _A setter that only you to this embodiment the same rather, this pulse period C _a setter (86 ₂₎ is pulse group period C _B setter (82) or these pulse group period C response Ji to pulse group periods Re this-out based on the input of the _B The pulse cycle CA in X, that is, the pulse interval is made variable, and the specific circuit example shown in FIG. 28 is provided.

That is, as shown in Fig. 28, it operates based on the input of the "pulse group period" signal, resets by sending H output after the set time _Tc , and resetting. output Chi is ing and L Thailand Ma (86 a), Li Te group Dzu Rere the H output of the cell based on words himself BALS group cycle C _B signal Tsu Bok by the Thailand Ma (86 a) The first flip-flop (86b) to be set is set based on the H output of the timer (86a) and is set based on the pulse group period X signal. The second full Clip off that will be re-Se Tsu preparative Te Lock flop (86 c), the first and second pulse period C _{A 1,} C of order the _{A 2} was to set a set value V _B and V _A — The first and second pulse period setting units (86e) and (86d) that output V _F , respectively, and the flip-flops (86b) and (86c) The analog switches (86ί) and (86g), each of which is controlled to be switched based on the output, the first or second pulse period setting units (86e), (86d) setting V _B, V _a - V _F and an integrator (86 i) the integrated output V _Q by comparing the output V _Q of was VB or the VA - the H output is sent when us V _F said integrator (86 i) re Se Tsu preparative control to that Pulse the H output of its co and scan period signal _{CA (C a 1, C A2} ) and to you output comparator Te of (86h) The second pulse period setting device (86d) Setter that gives send a pressure value V _A and (86da), F / V converter sent a voltage value V _F with a frequency voltage converting the pulse group period C _B signal (86dB), the set value V _a differential output V _a of the converted voltage value V _F - differentiator to obtain a V _F with a (86 dc), the more large signal value increase the frequency of the pulse group period C _B signal I am trying to output it. Therefore, by setting the set value V _A to a value larger than the maximum voltage V _F , the polarity of the differential output V _A — V _F that is proportional to the pulse group period C _B becomes positive. The pulse cycle C _A becomes longer in accordance with this (V _A -V _F ) value, and the pulse pause period (base current period) becomes longer due to the pulse cycle CA. As a result, the growth rate per unit time of the molten mass is suppressed. The set time _Tc of the timer (86a) is a pulse group based on the first pulse period signal CA. The molten mass at the tip of the wire electrode, which has already been formed by the pulse group current waveform before the current waveform, is defined by the pulse current and the boundary between the wire electrode and the molten mass. The constriction is created in the portion, and the constriction is promoted, and the time required for the molten mass to separate is accelerated. The pulse current based on the _second pulse period signal C _A2 transmitted thereafter promotes the growth of the next molten mass, and the transition of the molten mass due to the next pulse current group is performed in a regular manner. It works like it does.

That describes the generation of the pulse period C _A setter (86 ₂₎ that by the first and second pulse period signal C _{A 1,} C _{A 2} based on Figure 29. Also not a, pulse group period C _B setter (82) or these pulse group period C _B signal to enter the cell Uz preparative pin of the first full re Tsu Bed off Lock Bed (86 b) The first flip-flop (86b) is set by inputting it to the timer (86a) together with the timer (86a), and the output Px of the first flip-flop (86b) is set to the H level. Le and conducts Na Ru this and the by Ri Anal log scan I switch (86f) is, comparison input to the first pulse period setting unit (86 e) of the output V _B is comparator (86h) It becomes. The output comparator (86h) when the V _Q by comparing the output V _Q of the first pulse period setting unit (86 e) of the output V _B and an integrator (8Bi) coincides with V _B delivery, the output of its is you sends pulse period C _a signal to the first pulse period setting unit (86 e) in rather based Dzu pulse period C _{a 1.} Based on the output of the comparator (86h), the integrator (86i) is reset and starts the integration operation again, and the first pulse cycle C _A1 signal based on the above-described comparison is obtained. Repeat sending. Next, when the set time _Tc of the timer (86a) has been reached, the first flip-flop (86b) is reset by the timer output and reset. output P _x is the L level and name Ru by Ri Anal port Holdings I pitch in and this (86 yo that comparator non-conductive and Do Ri first pulse circumferential door setter (86e) (86 h) On the other hand, the second flip-flop and the jib (86c) are set by the above timer output, and the output P _Y is set to the H level. Le output V _a of Ru this and by Ri Anal the log scan I pitch name (86 g) and the second Pulse cycle setter is conduction control (86 d) - V _F is the comparison The comparator (86h) uses the output V _A -V _{F of} the second pulse period setting device (86d) and the output V _Q of the integrator (86i) as a comparison input to the comparator (86h). V _Q matched V _A -V _F by comparison At the same time, the output of which outputs a pulse cycle C _A2 based on the _second pulse cycle setting device (86d) as a pulse cycle C _A signal. Based on the output of the comparator (86h), the integrator (86i) is reset and starts the integration operation again, and the second pulse period _CA2 signal is transmitted based on the above-described comparison. repeat.

Match for to Chi, pulse period C _A signal that due to the pulse period setting unit (86 ₂₎ is response Ji by dispersing the pulse interval increases in cyclic Repetitive cycles of pulse current group The growth of the molten mass at the tip of the wire electrode during pulse arc welding ♦ In the detachment phenomenon, the boundary between the solid portion of the wire electrode and the molten mass At which the molten mass is released to the workpiece side by promoting constriction in the part, that is, the period of the set time _Tc of the timer (86a) The first pulse cycle CAi signal with a relatively short period is sent during the period, and the pulse interval, that is, the pulse rest period is long after leaving, and the period is relatively long. The second pulse period C _A2 is sent out to suppress the growth rate of the molten mass per unit time, so that the newly created molten mass at the wire electrode lifts up. In order to facilitate the rapid growth of the molten mass and to facilitate the detachment of the molten mass in the next pulse group, and to achieve regularity. In order to leave at a convenient time, the pulse interval is varied and distributed control is performed.

Next, the operation of the device of this embodiment will be described with reference to the waveform diagram shown in FIG. Also not a, pulse group period X setter (83), pulse group waveform Mi setter (84 _2), pulse width τ setter (85 ₂₎ and pulse period C _A setter (86 ₂₎ or al The pulse group period X signal, pulse group waveform (envelope) Mi signal, pulse width signal, and pulse period signal are sent to the pulse waveform shaper (81), respectively. During this, the non-Clip off Russia-up a such that pulse group period X set Joki (83) of the ring Lee Ya send紿速degree V _w depending on the Sadama that pulse group periodic C a signal The pulse group waveform is set based on the output of the pulse group charge Q setting device (90), and is reset based on the output of the pulse group waveform Mi setting device (84). ) sends out an output based on the pulse group period C _B signals, to be et al., pulse period C _a set Joki (86) in the pulse group period C _B signal及Pi pulse group period X signal Send output based on J

63 The pulse waveform shaping circuit (81) synchronizes to the pulse group period X signal, and outputs the pulse beak value of each pulse signal with pulse width CA and pulse period CA to the pulse envelope M i Each is obtained above and shaped into the intermittent pulse group waveform shown in Fig. 12. Et al is, you shaping the waveform obtained by superimposing a DC current IB to the intermittent pulse group waveform in the base current I _B signal of the base current I _B output unit (88) or al. By inputting the shaped pulse current signal and the current signal detected by the current detector (6) to the inverter drive circuit (2), the pulse shown in FIG. 30 is obtained. An inverter drive signal corresponding to the arc current waveform i is transmitted from the inverter drive circuit (2) to the inverter circuit section (1), and drives the inverter.

 By driving the inverter, a shaped AC waveform is output to the high-frequency transformer (3). Furthermore, by rectifying the output signal of the high-frequency transformer (3) into a DC waveform with high-frequency diodes (4A) and (4B), the pulse shown in Fig. 3Q can be obtained. The arc current waveform i is supplied to the weld, that is, the arc load (5).

In the arc load section (5), the wire electrode (52) is continuously supplied by a motor (not shown) simultaneously with the supply of the pulse arc current waveform i. Therefore, a pulse arc discharge (53) is generated between the wire electrode (52) and the workpiece (54) according to the pulsed arc current waveform i, and the workpiece (54) is discharged. Then, the tip of the wire electrode (52) is melted by pulse arc discharge (53). This The welding is performed by continuously dropping the melted portion of the wire electrode (52) to the melted portion of the workpiece (54). As a result, the wire electrode (52) naturally wears continuously. The wire electrode (52) is continuously fed to the welding torch (51) by the above motor to compensate for the consumption.

Here, in the above embodiment, as shown in FIG. 30, the pulse period CA in the pulse group period X sent from the pulse waveform shaper (81) has the configuration shown in FIG. pulse period C _a setter (86) to the I Ri depending on the pulse group period C _B is variably controlled, as you increase the pulse group period C _B for example, the second pulse period CA of its ₂ is controlled so that the pulse interval increases as the length increases. In this case, Ru first pulse period C _A i signal is always sent controlled at a constant Timing of. Therefore, the pulse period, that is, the pulse interval, is controlled by the pulse period c _A setting unit (86) in a distributed manner, and is set up to the set time _{Tc of} the built-in timer (86a). Due to the pulse current at pulse intervals based on the relatively short pulse period signal CA1 that is fixed at any pulse group period, the wire during pulse arc welding is generated. During the growth and detachment of the molten mass at the tip of the electrode, the necking at the boundary between the solid part of the wire electrode and the molten mass is promoted to ensure that the pulse current group has started for a predetermined time. At this point, the molten mass can be released to the workpiece side.

Then, after the molten mass after the set time _Tc of the timer (86a) has separated, the pulse group again causes the tip of the wire electrode to be separated by the pulse group. The molten mass at the edge grows with a new lift, and then during the base period the molten mass at the tip of the lifted wire hangs down until the start of the next pulse group. In this case, the shape of the molten mass is adjusted and the growth and detachment of the molten mass are repeated regularly, but the pulse interval, that is, the pulse interval proportional to the pulse group cycle C _a , that is, In order to prevent a fluctuation in the arc length by providing a pulse pause period, the pulse is transmitted based on a relatively long second pulse period C _A2 having a pulse interval proportional to the pulse group period c _B. The rising current of the molten mass newly formed on the wire electrode can be suppressed and the growth of the molten mass can be performed by the applied pulse current. Facilitates detachment of the molten mass in the next pulse group, and makes its transition regularly. U. In this case, since the second pulse period C _A2 is variably controlled in accordance with the pulse group period C _B , the arc length does not generate an under force or a sort. Allowable arc length J2. It is definitely suppressed to the following value ^.

Also, since the pulse current waveform is composed of multiple pulse currents, and this pulse current group is a discharge current waveform that repeats periodically, one pulse As a result, the upward electromagnetic force of the pulsed arc discharge at the wire electrode is intermittent due to the division of the pulse current waveform. Therefore, it acts to reduce the force for lifting the molten mass formed at the tip of the wire electrode. Me other its atmosphere gas not a et such only gas A Le Gore emissions mainly placed C 0 ₂ gas Even if the molten mass formed at the tip of the wire electrode is easily separated before it becomes a large mass.

Note that the set time _Tc for dispersively controlling the pulse period CA in the above embodiment can be determined by selecting an optimum departure time according to the welding conditions, for example, the electrode diameter and the atmospheric gas. Of course you can.

Fig. 31 shows the ninth invention. The first pulse period setting device (86e ') is composed of an amplifier instead of a variable resistor, and its output V the _B second pulse period setting output V _a of the (86 d) - V _F to the first pulse period C _{a 1} also in the second this in the value obtained by multiplying a predetermined amplification factor a Variable control is performed similarly to the pulse cycle. Ri by the and this you to cormorants yo this, can in the first pulse period C _A2 also respond Ji controlled to the first pulse period C _{A 1} pulse group period in the same manner as in CB, the Arc length fluctuations during one pulse period can be suppressed. Name you, the first pulse period C _{A 1} of this purpose the growth and withdrawal of that of Ho molten mass to a second pulse period C _A2 good short delivery Timing of the signal is also Ri is a This is a matter of course.

 Therefore, in this embodiment, the pulse interval is dispersed according to the pulse group period, and the amount of injected charge is suppressed by the pulse current per pulse time in the pulse group. Thus, the growth rate of the molten mass can be controlled according to the pulse group period.

In the above embodiment, the charge amount of the pulse group is detected, and Although the means for making the charge amount of the pulse group substantially equal to the desired charge amount has been described, the same applies when the energy injected into the molten mass is made substantially constant. It is natural that this effect can be obtained. Further, in the description of the above embodiment, the pulse arc welding apparatus has been described. However, in the arc period of the short-circuit transition arc welding apparatus, the embodiment means of the ninth invention is used. If it is present, the short circuit and the arc period will be regular, the margin of the weld bead and the fluctuation of the penetration depth will be small, and the effect of short-circuit transfer arc welding of higher quality can be achieved. There is.

FIG. 32 is a configuration diagram showing a pulse welding apparatus according to one embodiment of the tenth invention. In the figure, the same reference numerals as those in Fig. 1 indicate the same or almost corresponding parts. In Fig, (86 ₄₎ Pulse period C _A setter you only that in this embodiment, or, (30) the detected current value I and the that by the above SL current detector (6) An arc length detector that detects the arc length L (J2) between the wire electrode tip and the workpiece based on the voltage V detected by the voltage detector (7) is shown. The detector (30) has the configuration shown in FIG. In FIG. 33, the arc length detector (90) detects the detection current i via the insulation amplifiers (90a) and (90b) and the insulation amplifier (90a). preparative inclusive Ri, this is a) multiplied by) 'multiplier asking you to i (90c), to set the off cell Tsu G voltage constant K ₂ DC voltage constant setter (90 d), the multiplier ( 9Qc) an adder you adds each output of the DC voltage constant setter (90d) (90e) and its summing output V _x = K, the (i) · i + K ₂ and the voltage detector (7) It has a comparator (9 と) that sends out a comparison output L (Jl) = V -V _x according to the arc length by comparing the detected voltage V with the detected voltage V. The arc length signal corresponding to the arc length is detected based on the arc length.

That is, the arc length signal V is represented by R (i) as the positive characteristic constant of the arc, i as the arc current, A as the proportional constant to the arc length, J £ as the arc length, and B as the minimum voltage. when a was, can in represented as a V = R (i). i + a J2 + B, on the other hand, the circuit kinetically constant (i), the off cell Tsu G voltage constant was K ₂ At this time, the voltage V _x can be expressed as V _x = K i (i) · i + K ₂ . And follow, comparison difference its L (J £) = V - V x is, L (J2) = V - Vx = {R (i) - K X (i)} i + A j2 + B - K 2 And if ((1)) is chosen, then L (^) A l + (B — K ₂ ) and only the arc length can be a function, so Α, Β and kappa ₂ above Symbol comparators Tsu by the selection (10ί) or al the outputted comparative difference L () = V - V _X ho ∎ You can with detecting an actual arc length Ri Do the arc length signal.

Et al is, (91) with a release removal detector to obtain the detachment signal d _f of the molten mass, based on the arc length detector (90) that by the arc length detection value L (J), during withdrawal of the molten mass The arc voltage L (J2) = V — V _X corresponding to the arc length by the arc length detector (90) rises sharply, and the differential signal d _f = d { L)} / dt can detect the separation. Contact name and have you in the FIG. 32, based on the (10) is Wa Lee Ya feeding speed V _w setter to set the word i ya feed rate V _w and its set speed value (9) Wire delivery The wire feeder that controls the speed. (11) sets the pulse beak value of the pulses that make up the pulse group and averages the voltage applied to the pulse group waveform Mi setter (84). V. It is an average voltage V setting device that sets.

Oite in FIG. 32 arrangement, the pulse period C _A setter (8I ₄₎ are pulse group period C _B setter (82 ₄₎ and the detachable detector (91) or these and pulse group period C _B pulse period CA, one or Ri pulse interval based-out this is response Ji by pulse group period in X to the input of the departure signal d _f (base current period - pulse rest period) allowed to vary the As a specific circuit example, FIG. 34 is provided.

Match for to Chi, Remind as in FIG. 34, the cell Tsu Bok based on pulse group period C _B signal detection signal d based Dzu Rere Li cell Uz Bok of Te to _f of the disengagement detector (91) re that first unfavorable Tsu Bed off Lock Bed (86 a), Li based on the detection signals have groups Dzu to d _f Se Tsu Bok by pulse group period X signal of the disengagement detector (91) Se Tsu Bok is Ru second full Clip off Lock flop (86 b), the first and the second pulse period G _{a 1,} C _{a 2} order to to set the set value V _B the first and second pulse cycle setter the V _a you their respective output (86 c) (86 d) , full Clip off Lock up and ⁽⁸ 6 a) of (86 b) The analog switches (86e) and (86f), each of which is switching-controlled based on the output, the first or second pulse period setter (86 c), the set value V _B of (86 d), V _a and product Compare the output V _Q of the partial circuit (86 g) and H output is sent when the integrated output V _Q is was or V _B which reached the V _A The integrator Te (86 g) re Se Tsu preparative釗御be that when both its H-out pulse period signal _{C A (C A 1, C} A 2) a force and to you output ratio較器( 86h), and the setting value V _{A of} the second pulse period setting device (86d) is set to be larger than the setting value V _{B of} the first pulse period setting device (86e). By setting the set value V _A to a value larger than the set value V _B , the pulse cycle C output from the comparator (86h) based on the comparison with the integrated output V _Q is obtained. _A is a pulse cycle based on the set value V _A GA ₂ is longer than a pulse cycle C _{A 1} based on the set value V _B, and is longer than the pulse cycle C _A. As the quiescent period (base current period) is lengthened, the growth rate of the molten mass per unit time is suppressed.

Therefore, the first pulse period signal CA! The molten mass at the tip of the wire electrode, which has already been formed by the pulse group current waveform immediately before the pulse group current waveform based on the boundary portion of the i ya electrode and molten mass Ku promotes Ku fin of Bireotsu Ku Resona to disengage the molten mass, occurrence of detachment signal d _f is by Ri detection output to disengagement detector (91) The pulse current based on the _second pulse period signal CA2 sent later promotes the growth of the next molten mass, and the molten mass by the next pulse current group It works to make the transition of the system regular.

The pulse period C _A setter (86 ₄₎ first that by the the second pulse period signal C _A, that describes the production of C _{A 2} on the basis of FIG. 35. Also not a, pulse group period C _B setter (82) or these Pulse group cycle C _B signal Se Tsu bets end of the first full re blanking off Lock Bed (86 a) The first flip-flop, the jib (86b), is set by input to the slave, and the output _Px is at the H level. Ri by the Analog Selecting scan I pitch (86 e) is conductive, that the first pulse cycle setter output V _B of (86c) Do a comparison input to the comparator (86h). Comparator (86 h) is V. compares the output V _Q output V _B and an integrator (86 g) of the first Pulse cycle setter (86 c) There sends an output when a match with the V _B, its output is pulse period C _A signal to the first pulse cycle setter Pulse period rather based on (86 c) C _{A 1} Is sent. The comparator (86 h) the integrator based on the output of the (86 g) is re Se Tsu Sorted starts integration operation again, pulse cycle of based Ku first the foregoing comparison C _A i Repeat the signal transmission.

When leaving the signal that by the next disengagement detector (91) is you arrival, the first full re Tsu Bed off in synchronization with the detachment signal d _f This Lock Bed (86 a) is re Se Tsu DOO has been its output PX is Ri by the and this L-les bell and ing, Anal b Holdings I pitch ⁽⁸ 6 e) is non-conductive and Do Ri first pulse cycle setter (86 c ), The comparison input to the comparator (86h) is interrupted. On the other hand, the withdrawal signal d second full Li Tsu blanking off Russia Breakfast (86 b) in Tsu by the _f ho cell Tsu been bet by its output P γ is Ri by the and this H Les Bell and ing The analog switch (86ΐ) is conducted and the output _{VA of} the second pulse period setting device (86d) becomes the comparison input to the comparator (86h). . The comparator (86h) compares the output V _{A of} the second pulse period setting device (86d) with the output V _Q of the integrator (86g), and when V _Q matches V _A. Output to Delivery, the output you sends the pulse period C _A signal to second pulse period setting unit (86 d) to rather based Dzu Pulse period C _{A 2.} Based on the output of the comparator (86h), the integrator (86g) is reset and starts the integration operation again, and the second pulse period C _A2 signal based on the above-described comparison is obtained. Is repeated.

Match for to Chi, pulse period C _A signal that due to the pulse period setting unit (86 ₄₎ causes different of al the Pulse interval based on the withdrawal detecting molten mass Wa Lee Ya electrode tip The growth of the molten mass at the tip of the wire electrode during pulsed arc welding time of reliably molten mass to facilitate Ru is separated leaving the weld object side, one or Ri leaving detector (91) during detection signal d _f is until you arrival that by the ratio较的period A short first pulse period CA i signal is sent out, and after leaving, the second pulse with a relatively long period should maintain the pulse interval, that is, the pulse pause period longer. by sending a pulse period C _{a 2} between this you inhibit the growth rate of单位time equivalent Ri of the molten mass, a new word y ya In the next pulse group, the lift-up phenomenon of the molten mass formed at the extreme part was suppressed, and the molten mass could be grown quickly. Dispersion control is performed with different pulse intervals so that the molten mass can be easily separated and separated at a regular time.

Next, the operation of the device of this embodiment will be described with reference to the waveform diagram shown in FIG. First, pulse group cycle C _B setting device (82) Pulse group period X setter (83), Pulse group waveform M 1 setter (84), Pulse width Te setter (85)及beauty Pulse period C _A setter (86 ₄₎ or Luo their respective pulse group period C _B signals, pulse group period X signals, pulse group waveform (envelope) M i signals, signal Te pulse width and pulse period C _a signal pulse waveform Send to the shaper (81). During this, the pulse period C _A setter (86) is Do Ni Let 's you sends output based on Pulse group cycle C _B signal, Ba pulse period C _A you output a leaving detection vessel (91) until that causes arrival is due that withdrawal signal d _f to send the pulse cycle signal C _{a 1,} after the arrival of withdrawal signal d _f also Ri by said pulse cycle signal C _a i A relatively long pulse period signal C _A2 is transmitted.

Pulse waveform shaping circuit (81) is to synchronize the pulse group period X signal, Pulse width Te, pulse the Pulse beak values of Pulse period C _A also One of Kakupa pulse signal Each is obtained on the envelope M i and shaped into the intermittent pulse group waveform shown in FIG. 36. Et al is, you shaping the waveform obtained by superimposing a DC current IB to the intermittent pulse group waveform in the base current I _B signal of the base current I _B output unit (88) or al. The shaped pulse current signal and the current signal detected by the current detector (6) are input to the inverter drive circuit (2), as shown in Fig. 36. An inverter drive signal corresponding to the pulse arc current waveform i is transmitted from the inverter drive circuit (2) to the inverter circuit section (1) to drive the inverter. .

The AC waveform shaped by the drive of this inverter Is output to the high-frequency transformer (3). Furthermore, by rectifying the output signal of the high-frequency transformer (3) into a DC waveform with high-frequency diodes (4A) and (4B), the pulse arc shown in Fig. 36 can be obtained. The current waveform i is supplied to the welding part, that is, the arc load part (5), and is applied.

In the arc load section (5), the wire electrode (52) is continuously supplied by a motor (not shown) simultaneously with the supply of the pulse arc current waveform i. Accordingly, a pulse arc discharge (53) is generated between the wire electrode (52) and the workpiece (54) according to the pulse arc current waveform i, and the workpiece ( 54) and the tip of the wire electrode (52) are melted by pulse arc discharge (53). The welding is performed by continuously dropping the melted portion of the wire electrode (52) onto the melted portion of the workpiece (54). Therefore, the wire electrode (52) naturally wears out continuously. The wire electrode (52) is continuously fed to the welding torch (51) by the above motor to compensate for the consumption. -Here, in the above embodiment, as shown in FIG. 36, the pulse period G _A within the pulse group period X sent from the pulse waveform shaper (81) is used. based on the departure signal d _f that by the withdrawal detector Ri by the Pulse period C _a setter FIG. 34 structure (86 ₄₎ (91) is variably controlled, before the arrival of the detachment signal d _f is In any pulse group period, the pulse current during pulse arc welding is determined by the pulse current at pulse intervals based on the relatively short pulse period signal C _A, which is fixed. Growth of molten mass at the tip ♦ In the detachment phenomenon, the constriction at the boundary between the solid portion of the wire electrode and the molten mass can be promoted, and the molten mass can be detached to the workpiece side.

After the molten mass has detached, the pulse group again grows at the tip of the wire electrode while the molten mass is newly lifted, and then grows during the base period. The molten mass at the tip of the wire hangs down, and the shape of the molten mass is adjusted by the start of the next pulse group. Although ing to the this return Ri, delivered on the basis of the arc length fluctuation preventing all rather of J, leaving the signal d relatively long second pulse period that is sent on the basis of the detection of the _f C _{a 2} By the generated pulse current, the lift-up phenomenon of the molten mass newly formed on the wire electrode part can be suppressed and the molten mass can be grown. To facilitate the detachment of the molten mass in the next pulse group, and to make the transition in a regular manner . This case, Ri by the above withdrawal signal d Pulse period C _{A 2} detects Based on of recurrence relatively long had a second of _f, arc length Ji raw is A down Zehnder mosquito Tsu DOO Not allowed arc length J2. It is surely suppressed to the following value ^.

Also, since the pulse current waveform is composed of multiple pulse currents and this pulse current group is a discharge current waveform that repeats periodically, one pulse is composed of multiple pulse currents. Since the pulse is divided into pulses, this upward division of the pulse current waveform interrupts the upward electromagnetic force of the pulse arc discharge at the wire electrode. Since it continues, it acts to reduce the force to lift the molten mass formed at the tip of the wire electrode. Me other its atmosphere gas not a et such only gas § Le Gore emissions mainly, C 0 ₂ molten mass is also formed at the tip of the word i catcher electrodes at the gas readily previously ing and Daikatamari Leave.

 Also, in the above embodiment, the pulse interval in the pulse group was switched before and after the molten mass was separated, but either the pulse width or the pulse period in the pulse group was changed. It may be switched before or after withdrawal. In other words, it is necessary to reduce the pulse width to increase the arc length by raising the remaining molten mass after the molten mass has been separated by the pulse. By increasing the period, the lifting force by the pulse is reduced, and the growth rate of the molten mass can be controlled.

 In the description of the above embodiment, the pulse arc welding apparatus has been described. However, in the arc period of the short-circuit transition arc welding apparatus, the embodiment means of the present invention is provided. This will result in a regular short circuit and arcing period, less variation in weld bead buildup and penetration depth, and better quality short circuit transfer arc welding. Has the effect.

FIG. 37 is a block diagram showing a pulse welding apparatus according to one embodiment of the eleventh invention. In the drawing, the same reference numerals as those in FIG. 1 indicate the same or corresponding parts. And have you in FIG, (8 6 ₅₎ Ri Oh in your only that pulse period c _A setter to the present embodiment, this pulse period G _A setter (8 6 _5), pulse group cycle From the C _B setting device (82) The pulse period C _A , that is, the pulse interval in the pulse group period X is changed in response to the input of the pulse group period C _B of the pulse group period C _B. Figure 33 is provided as a typical circuit example.

That is, as shown in FIG. 38, the operation is performed based on the input of the pulse group periodic signal, and the output is reset after transmitting the H output after the set time _Tc . output is re Se Tsu preparative based on H output L and ing Thailand Ma ⁽⁸ 6 a), cell based on the pulse group period CB signals Tsu Sorted said Thailand Ma (86a) to The first flip-flop (86b) is set based on the H output of the timer (86a) and reset based on the pulse group period X signal. the second full Clip off Lock flop (86 c), the first and second pulse period C _{a 1,} C _{a 2} order to to set the set value V _B and V _a of its Resolution The first and second pulse period setting units (86e) and (86d) output the flip-flops (86b) and (86c) based on the outputs of the flip-flops (86b) and (86c). Each one Chi in g controlled Ru Anal log scan I pitch and (86 f) (86 g) , was first or second pulse cycle setter (86e), the set value V _B of (86d) , V _A and the output V _Q of the integrator (86 i) are compared. When the integrated output \ / ₀ reaches V _B or V _A , an H output is sent out and the integrator (86 i) is output. ) have a re Se Tsu preparative control to that co to the H output pulse cycle signal _{C a (C a 1, C} A2) and to you output comparator (86h) and the second pulse The set value V _A of the pulse period setting device (86d) must be set larger than the setting value V _{B of} the first pulse period setting device (86e), and the set value V _A Is set to a value larger than the set value V _B , the pulse period C _A output from the comparator (86 h) based on the comparison with the integral output V _Q is set to the set value V _The pulse period C _A2 based on _A becomes longer than the pulse period C _A1 based on the set value V _B, and the pulse period CA causes a no-pulse rest period (base current). ), The growth rate of the molten mass per unit time is suppressed. To name you, and the set time T c of Thailand Ma (86 a) Tsu by the preceding pulse group current waveforms of the first pulse period signal C _A i in based rather pulse group current waveforms The molten mass at the tip of the wire electrode formed in step 2 is melted by the pulse current to narrow the neck at the boundary between the wire electrode and the molten mass and promote the narrowing. Set the time until the lump detaches. The pulse current based on the _second pulse period signal C _A2 transmitted thereafter promotes the growth of the next molten mass, and the transition of the molten mass by the next pulse current group is regularly performed. It works like it does.

That describes the generation of the pulse period C _A setter first and second that by the (86) Pulse periodic signals C _{A 1,} C _{A 2} on the basis of FIG. 39. First, when the pulse group period CB signal from the pulse group period CB setter (82) is input to the set terminal of the first free-flow and rib (86b), The first flip-flop (86b) in the above S is set by inputting it to the timer (86a), and the output _Px is set to the H level. bell and by Ri Anal log scan I Tsu switch (86f) are conducted and ing this, the first pulse period setting unit output V _B of (86 e) of the comparator ⁽⁸ 6h) It becomes comparison input. The comparator (86h) V _Q is sent to output when a match with the V _B by comparing the output V _Q of the first Pulse cycle setter (86 e) of the output V _B and an integrator (86i), an output the sends pulse period C _a signal and to the first pulse cycle setter (86 e) in rather based Dzu pulse period G _{a 1.} Based on the output of the comparator (86h), the integrator (86i) is reset and starts the integration operation again, and the first pulse period C _A1 signal based on the above-described comparison is obtained. Repeat sending.

Next, when the set time _Tc of the timer (86a) has been reached, the first flip-flop (86b) is reset by the timer output. output P _x of that Te is that by the L-les bell and Ri by the and this ing Anal port Holdings I pitch (86f) is non-conductive and Do Ri first pulse cycle setter (86e) comparison The comparison input to the vessel (86 h) is cut off. On the other hand, the second of full re-Tsu blanking off Russia Tsu Breakfast in Tsu by the above-mentioned Thailand while the output (86c) is a cell Tsu door output P _Y of the Soviet Union Ri by the and this H Les Bell and ing Anal b Holdings I pitch (86 g) is that Do a comparison input of the output V _a of the second Pulse cycle setter is conduction control (86 d) is the comparator to (86h). Comparator (86 h) when the output V _A and V _Q by comparing the output V _Q of the integrator ⁽⁸ 6i) of said second pulse periodic setter (SSd) coincides with V _A sends an output, the output of that is you sends pulse period C _a signal to second pulse period setting unit (86d) based on Dzu rather pulse period C _{a 2.} Based on the output of the comparator (86h), the integrator (86i) is reset and starts the integration operation again, and the second pulse period C _A2 based on the comparison described above. Repeat the signal transmission. Match for to Chi, pulse cycle signal that due to the pulse period setting unit (86 _5), Wa Lee Ya electrode tip respectively after the set time T _c of the withdrawal to that Thailand Ma of the molten mass (86 a) of It is made to disperse into a pulse interval that is relatively longer than the previous pulse interval, and the growth of the molten mass at the tip of the electrode during pulse arc welding The point at which the necking is promoted at the boundary between the solid part of the wire electrode and the molten mass to ensure that the molten mass is released to the workpiece side, that is, at the time of the timer (86a) The first pulse cycle CAi signal, which has a relatively short cycle during the set time period, is sent, and after leaving, the pulse interval, that is, the pulse pause period, is held for a long time. the growth rate of a relatively long period rather to base second Pulse period C _{a 2} a delivery unit time equivalent Ri of molten mass In this way, the lift-up phenomenon of the newly formed molten mass at the wire electrode can be suppressed, and the molten mass can be quickly grown. In order to facilitate the detachment of the molten mass in the next pulse group, and to make the detachment at a regular time, the pulse interval is varied and the dispersion control is performed. .

Next, the operation of this embodiment will be described with reference to the waveform chart shown in FIG. 4Q. Also not a, pulse group period C _B setter (82), Pulse group period X setter (83), Pulse group waveform setting unit (84), setter Te Pulse width (85) and Pas Le scan period C _A setter (86 ₅₎ or al its Rezorepa pulse group period C _B signals, pulse group period X signal, pulse group waveform (envelope) M i signal, Te pulse width Faith No. and Ru sending a Pulse period C _A signal Pulse wave疮整form device in (81). During this, Pulse period C _A setter (86) is Do Ni Let 's you sends output based on Pulse group cycle C _B signal and pulse group period X signal, you output path The pulse period CA sends the pulse period signal C _{A1 from the} start of pulse transmission until the timer reaches the set time _Tc of the timer (86a), and after the set time _Tc Transmits a pulse cycle signal C _A2 having a relatively longer interval than the pulse cycle signal CA.

The pulse waveform shaping circuit (81) synchronizes with the pulse group period X signal, and outputs the pulse beak value of each pulse signal having a pulse width and a pulse period CA on the pulse envelope M i. Respectively, and shaped into the intermittent pulse group waveform shown in Fig. 40. Et al is, you shaping to the base current I _B output unit (88) or these base current I _B signal waveform weight DC current IB to the intermittent pulse group waveform. By inputting the shaped pulse current signal and the current signal detected by the current detector (6) to the inverter drive circuit (2), the pulse signal shown in FIG. 40 is obtained. An inverter drive signal corresponding to the luth arc current waveform i is transmitted from the inverter drive circuit (2) to the inverter circuit section (1), and drives the inverter.

By driving the inverter, a shaped AC waveform is output to the high-frequency trans- former (3). Furthermore, by rectifying the output signal of the high-frequency transformer (3) into a DC waveform with the high-frequency diodes (4A) and (4B), the signal shown in FIG. 40 is obtained. Ruth The arc current waveform i is supplied to the weld, that is, the arc load (5).

 In the arc load section (5), the wire electrode (52) is continuously supplied by a motor (not shown) simultaneously with the supply of the pulse arc current waveform i. Accordingly, a pulse arc discharge (53) is generated between the wire electrode (52) and the workpiece (54) according to the pulse arc current waveform i, and the workpiece (54) And the tip of the wire electrode (52) is melted by pulse discharge (53). The welding is performed by continuously dropping the melted portion of the wire electrode (52) to the melted portion of the workpiece (54). Naturally, the wire electrode (52) is continuously consumed. The wire electrode (52) is continuously fed to the welding torch (51) by the above motor to compensate for the consumption.

Here, in the above embodiment, as shown in FIG. 4Q, the pulse period CA in the pulse group period X sent from the pulse waveform shaper (81) is used. the FIG. 38 structure of pulse period CA setter (86 ₅₎ to the I Ri based on the set time T _c that by the Thailand Ma (86a) is variably controlled, pulse transmission start or found the setting time T _c of arrival Itarumae are shorted with a pulse current of based rather pulse interval relatively short pulse period signal C _a i fixed even at the one of the pulse group periods, pulse arc welding During the growth and detachment of the molten mass at the tip of the wire electrode, the constriction at the boundary between the solid portion and the molten mass of the wire electrode is promoted to reliably start the pulse current group. After a specified time _Tc from the It can be released to the object side.

After the molten mass after the set time Tc has separated, the pulse group grows while the molten mass is newly lifted at the tip of the wire electrode again. Subsequently, during the base period, the molten mass at the tip of the lifted wire hangs down, and the shape of the molten mass is adjusted by the start of the next pulse group, and the molten mass is melted. Although ing to that may return Ri regularly Repetitive growth and separation of mass, the arc length is rather base to prevent the you grow above a predetermined value, based on a relatively long second pulse period CA ₂ By using the pulse current to be sent out, it is possible to suppress the lift-up phenomenon of the molten mass newly formed on the wire electrode portion and to grow the molten mass. To facilitate the separation of the molten mass in the next pulse group, and to make the transition in a regular manner As a result, the arc length is the allowable arc length J2 at which undercut does not occur. It is surely suppressed to the following value ^.

Also, the pulse current waveform is composed of a plurality of pulse currents, and this pulse current group is a discharge current waveform that repeats periodically, so that one pulse consists of a plurality of pulse currents. As a result, the upward electromagnetic force of the pulse arc discharge at the wire electrode is intermittent due to the division of the pulse current waveform. Therefore, it acts to reduce the force for lifting the molten mass formed at the tip of the wire electrode. Me other its, not a only a et atmosphere gas is A Le Gore down prevailing gas, C 0 ₂ molten mass can have you the gas formed at the end of the word ya electrode and Dai瑰ne To Easily detached before.

The set time _Tc for dispersion control of the pulse period C _A in the above embodiment _Tc is to select an optimum departure time according to welding conditions, for example, electrode diameter and atmospheric gas. Of course, you can do that.

 Also, in the above description of the embodiment, the pulse arc welding apparatus has been described. However, in the arc period of the short-circuit transition arc welding apparatus, if the embodiment of the invention is provided, the short-circuit In addition, the arc period becomes regular, the amount of weld bead build-up and the variation in penetration depth are reduced, and there is an effect that a higher quality short-circuit transfer arc welding can be performed.

 Further, in the above embodiment, the pulse interval in the pulse group was set such that the separation of the molten mass was determined at a preset time from the start of the pulse group, and the pulse group was determined before and after the estimated departure time. The pulse interval of the pulse group was switched, but the pulse width or pulse cycle in the pulse group was switched based on the estimated departure time. Is also good. That is, after the molten mass has detached, the remaining molten mass is lifted up by the pulse to increase the arc length. By increasing the pulse period, the lifting force of the pulse is reduced, and the growth rate of the molten mass can be controlled.

Next, FIG. 41 is an overall configuration diagram of a pulse arc welding apparatus according to an embodiment of the invention of FIG. In the figure, the same reference numerals as those in FIG. 32 indicate the same or corresponding parts, and the detailed description thereof will be omitted. Description is omitted. In the figure, (92) detects a signal corresponding to the change in arc length based on the detected arc voltage V and detected arc current I, and outputs a signal A (L (J2)). It is a detector, and its detailed configuration and operating characteristics are shown in Fig. 33 and Fig. 43, respectively. (93) is a detachment detector that detects the detachment of the molten mass based on the arc length detection signal (L)), and the pulse current waveform control circuit (8) has ( 87) is a pulse group waveform gradient setting device which sequentially varies the level of each pulse constituting the pulse current group and sets a pulse group waveform by giving a gradient to the pulse level. In the configuration of the pulse group waveform gradient setter (87) (FIG. 42), (87 is a first group which controls the output of the pulse group period signal CB and the pulse group period signal X). off Clip off Lock-flops (hereinafter, you abbreviated as F / F 1), (87 2), (87 3) is a _{resistor, R 2 (R 2 ",} (87 4) is co down Devon Sa C, (87 ₅₎ is that make up the integrated circuit in Oh Ri this is found the circuit elements in O pairs down flop. 7 ₆₎ resistors R _3, (87 ₇₎ is collected by run-g is te 1 (hereafter! and abbreviated) with nitrous is, the T r 1 (87 ₇₎ oN operation and co to co-down Devon Sa C (87 ₄₎ to蓄gills was a resistor charge of (87 ₆₎ that form structure the discharge circuit you discharge and through the. (e) the door run-g is te 2 (below T _{r 2} that Gyosu short-circuit system the input and output ends of the O pair down-flops ⁽⁸⁷ ₅₎ (Abbreviated).

(87 ₉ ) is a second _flip-flop (hereinafter abbreviated as F / F 2) for controlling the ON operation of _Trl (87 ₇ ), and (87 ₁₀ ) is Τ _{Γ 2} (87 β) is controlled by 0 Ν, and (87 ii) is the pulse group period signal. Except for the signal X input, the transistor 3 (hereinafter abbreviated as Τ _Γ3 ), which lowers the output level of F / F 1 (87i) to the earth _potential , (87! ₂ ), (87 ₁₃₎ is F / F 1, 2 (87 J, (87 9) Li Se Tsu DOO signal input for bus Tsu off § of (87 t ₄₎ inverts the operations a down-flop output This is an inversion circuit that outputs to the pulse waveform shaper (81).

Next, the operation of the pulse group waveform gradient setting device (87) based on the above configuration will be described with reference to the signal waveform diagram of FIG. When pulse group period C _B setter (82) to Yo Ri卩/卩1 (87!) Of Se Tsu preparative terminal pulse group periodic signals C _B (in FIG. 44 (a)) is are entered , O pair down flop (87 ₅₎ is a resistor R ₂ (87 ₃₎ and co emissions Devon Sa C (87 ₄₎ Tsu by the by inverting circuit output charging characteristics that by the time constant that Kemah ( 87 ₁₄ ) (S i in FIG. 44 (e)). Also, before the output of the F / F 1 (87 i) is O pair down flop (87 ₅₎ that reaches the beak Les bell, "H" output Les bell output resistor iw Dsjs) to You This Tokio pair down-flops (87 ₅₎ the resistance (87 ₂₎ and co emissions Devon Sa C (87 ₄₎ is from that make up the integrated circuit shall be the charge time constant circuit, "H" Les the bell signal you output-out line to charge and follow the above charging time constant (S ₂ in FIG. (e)). - How, during operations A down-flop (87 ₅₎ that not output the charging voltage, detecting the detachment of the molten mass on the basis of the withdrawal detecting circuit (8) is the signal A (L (J £)), When the release signal is output to F / F 2 (87 ₉ ) ((b) in the same figure), the / signal is input to へ₁ (87 ₇ ) from F / F 2 (87 ₉ ), the co down de ends of emissions Sa C (87 ₄₎ is Ru are shorted Tsu by the resistor R ₃ (87 _6). As a result, capacitor C (87 ₄₎ to the stored al charge resistors R ₃ (87 ₆₎ and co-standard test '. Emissions Sa C (87 ₄₎ discharge characteristics determined or Ru in Tsu by the time constant of (in FIG. (E ) of S ₃₎ with rather output Ho line decreases at a predetermined rate of the op a down-flop for you discharge (87 _5).

Also, at the time of the decrease in operating A down-flops (87 ₅₎ the extent or at the output there Ru, inverted Pulse group period signal X is "H" Ri by Les Bell "L" Les Bell, When the signal output to Suspend, F / F 1 (870 Li Se Tsu preparative terminal connected fin converters (87 _{1 2)} through the "H" Pulse inverted Les bell of Since the group period signal X ((c) in the figure) is input, the output of the F / F 1 (87 t) is inverted to the “L” level and the output of the inverter (87 ₁₀ enter to), fin Roh one data (87 _{1 0)} of Ru oN to operate the T _{r 2} in Tsu by (87 ₈₎ in the anti-non-inverting output. in addition, Li of the F / F 2 (87 ₉₎ Se Tsu door terminal also enter the stomach down bar data (87 i ₃₎ inverted Pulse group life HazamaShin No. X and through the, "L" force out of the Les bell signal to T _{r 2} (87 ₇₎ 0 FF operate. and follow, both ends of the au pair down-flops (87 ₅₎ to T _{r 2} (87 _β) The output of Tsu is shorted operations A down-flop (87 ₅₎ is lower in the that (S ₄ in FIG. (E)) suddenly雩level. Pulse group period is Ri end, next pulse oN Ru or in the group period, for that to prevent the input from that Kuwawa to operations a down-flops (87 _5), the anti-non-inverting output of the T _{r 3} (87 i J Lee down bar data (87 i 0) input is lowered to the ground conductive position the output of the F / F 1 (87, one holding the "L" Les bell input of the op a down-flop (87 ₅₎

Ni will Yo or more, the charge of the output controlled operations A down-flops (87 ₅₎ Discharge output signal is inverted by Tsu by the inverting circuit (87 _14), it is outputted chevron shape of the envelope signal E _s (in FIG. 44 (e) a pulse waveform shaper to (81a). This pulse waveform shaper (81a) superimposes a pulse current group as shown in (f) of the figure on the basis of the base current I _B for each pulse group cycle C _B and the arc current. Then, the signal is output to the comparator (87).

 As described above, when the pulse envelope signal Es is formed by the pulse group waveform gradient setting device (87), the growth and detachment phenomena of the molten mass at the tip of the wire electrode occur. In the pulse group cycle, the pulse current level increases sequentially from the start of the pulse current transmission, and the electromagnetic pinch force of the pulse arc discharge gradually increases. Thus, the necking at the boundary between the solid portion of the wire electrode and the molten mass is promoted, and the delay of the detachment of the molten mass is suppressed, so that the molten mass is reliably released to the workpiece. it can .

 In addition, the pulse current is gradually changed so that the pulse current level is gradually reduced after the molten mass is detached, so that the pulse current is regenerated on the wire electrode when the molten mass grows. It acts to suppress the lift of the molten mass depending on the value, and suppresses the delay of separation in the next pulse group.

Name your, the above examples are Tsu by the pulse group or al ing pulse current group waveform to the envelope signal E _s Yamagata shape, but shows an example you modulation waveform shape to the mountain shape, A similar effect can be obtained even if one pulse having a predetermined pulse period is formed into a mountain shape. Fig. 45 shows a circuit configuration for performing this function. There are the following. In this circuit configuration, a pulse group that sets the output period of a single pulse in place of the pulse group period CB setting unit and pulse group period X setting unit shown in Fig. 42 is used. It is provided with a pulse period setting device (88b) and a pulse period setting device (88c) for setting a pulse width, that is, a pulse output period. The operation is the same as that of the above embodiment. .

 Next, the operation of the arc length detector (92) will be described with reference to FIG.

The arc length detector (92) first inputs the arc current detection value (I) input via the absolute green amplifier (92b) to the multiplier (92c), and this multiplier In (92c), the function input from the function setting device (92d) is multiplied by the current-dependent function K i U) and input to the adder (92f). Adder DC voltage setter in (92f) (92 e) good Ri DC voltage constant to set the base voltage because (K ₂₎ was that have been input, the adder (92 e) or we first 43如rather reference arc voltage V _x as shown in figure Ru is output to the comparator (92 g). Good power sale to the comparator of this arc voltage detected value and follow the arc length of the reference arc voltage V _x and the insulating Hair emissions Bed (92 a) good Ri sometimes in (92g) (V i) and comparing of the output Based on the obtained difference signal, a signal A {1 {JI)) corresponding to the arc length corresponding to the true arc length that changes every moment is output.

FIG. 46 is a block diagram of one embodiment of the thirteenth invention. In this example, a pulse current is applied for a certain period every time a molten mass is detected to be separated, and the charge amount of the pulse current is calculated. Is fixed and the melting capacity is It is always kept constant. As shown in the figure, (12) is a pulse current waveform control circuit that controls the waveform of a pulse current that forms an arc current together with the base current. ) Is an arc length detector that detects the instantaneous arc length and outputs an arc length signal, and (12b) is a delamination detection that detects the detachment of the molten mass from the arc length signal and outputs a detection signal. (12c) A target arc length setting device that sets the target arc length that changes every moment, and (12e) compares the arc length signal at each moment and the target arc length. A comparator that outputs a difference signal, (10 OA) is a pulse group current generator that sets the reference pulse current waveform, and (12 h) is a pulse current group output according to the wire feeding speed period C _B current waveform cycle setter to set the, (12 i) are Anal Ri Do and Se Tsu preparative conditions for each one cycle C _B The current waveform period during which the 0N signal is output to the switch (9j) X setting period, (12k) is set together with the separation detection signal input, and the analog log is set. Flip-flop (F / F) that outputs 0 N signal to switch (12.), (121) is base current output device, (12m) is generated pulse current group (12η) compares the pulse current output from the adder (12 m) with the detected value of the arc current. Based on the comparison result, the adder (12η) Comparator A, which controls ON / OFF of the inverter drive circuit (2), (i2p) is a charge amount setting device that sets the charge amount of the pulse current, and its configuration is (12) ρ) is an integrator that integrates the pulse current group after detection of departure to calculate the charge amount, and (Up ₂ ) is the integrator that flows after detection of departure. Predetermined charge amount setter you preset amount of charge pulse current group, (12 p ₃₎ is a current waveform period X setter when the charge amount of pulse current group to be output has reached a predetermined charge amount (12 i ) A comparator B for outputting a reset signal is an average voltage setting device for determining a predetermined charge amount setting reference.

 Next, the operation of this embodiment based on the above configuration will be described with reference to the waveform diagrams of FIGS. 47 (a) to (c).

First, when the current waveform period C _B setter (12 h) good Ri periodic signal, is input to the SET pin of the current waveform period Ru consists of F / F X setter (12 i), F / The output signal from F (12 i) turns on the analog switch (12 j) and inputs the output of comparator A (12 e) to the pulse group generator (10 OA). To In this state, the comparator A (12e) compares the arc length detected by the arc length detector (12a) with the target arc length set in advance. (12c), and compare each arc length ((c) in Fig. 47). The result of this comparison is input to the pulse group generator (100A) as a difference signal between + and-, and the preset pulse current value is added or subtracted to obtain the target arc length Corrected to the desired pulse current waveform. The base current output from the base current output device (121) is superimposed and input to the comparator C (12η) as an arc current reference value. The comparator C (12η) compares the arc current detection value detected by the current detector with the arc current reference value, and if the arc current detection value is greater than the arc current detection value, the inverter drive circuit Output an ON signal to (2), and A pulse arc current output from an arc welding power source is supplied between the electrode (52) and the workpiece (54). When the detected arc current is greater than the reference arc current, the operation OFF signal is output to the inverter drive circuit (2). Next, when the detachment signal is output from the detachment detector, the F / F (12k) is set and the analog switch (12ο) is turned on. The pulse current waveform output from the analog switch (12j) is input to the charge amount setting device (12b). The input pulse current waveforms (Fig. 47 (b) N = 7 to 16) are integrated by the integrator (12 _Pl ) and compared as the pulse current charge. Input to the container B (12p ₃ ). Also, One by the this comparator B (12p ₃₎ to Ho as a comparison after molten mass withdrawal, the amount of charge because pulse current achieve a constant melt volume predetermined charge amount setter (12p ₂₎ Is set. When the comparator B charge amount that will be input to the (12p ₃₎ is One Do rather equally a predetermined charge amount, Ki pulse group generator (10 OA) or we de with this to obtain a constant melting capacity Assuming that a pulse current of a charge amount ((b) in the figure, N = 7 to 16) is output, the integrator (12 _Pl ) is reset, and a comparison is made. Outputs the F / F (12 i) reset signal to turn off the output of the detector A (12 e). Above operation your only that withdrawal detected current waveform period C _B in the (first 47 Figure (a)) rows of power sale this each, the melting of a certain amount of fusion above end after withdrawal detection Wa Lee Ya electrode Lumps are formed and an average good weld bead is obtained.

Hereinafter, the fourteenth invention when short-circuit transfer welding is performed is described. An embodiment of the pulse welding apparatus according to the present invention will be described with reference to FIG. 48 (A). In the figure, the same reference numerals as those in Fig. 46 indicate the same or corresponding parts. Figure, (12 _q) is shorted you output to short-circuit conditions and Anal the ON signal is determined § over click period B Holdings I pitch of the molten mass (12 _s) - arc determiner, (12 _r) is A short-circuit current waveform setting device for setting a short-circuit current waveform for burning off a short-circuited molten mass, and (100B) is an arc current generator for generating a current during an arc period.

 Next, the operation of this embodiment based on the above configuration will be described with reference to FIGS. 49 (A) and (B).

Now, when the molten mass short-circuits to the work (54), the arc length sharply decreases as shown in (c) of Fig. 49 (B), so the arc length signal sharply decreases and short-circuit occurs. (1) Input to the arc judgment device ( _12q ) to detect short circuit. As a result, the analog switch (12 s) is turned on and the short-circuit current burns out the short-circuited molten mass by the short-circuit current waveform setting device (12 r) (Fig. 49 (A) Input (b)) of above to the adder (12m). The adder (12m) superimposes the base current output from the base current output device (121) on the short-circuit current waveform and generates an arc current reference value for burning out the molten mass. (12η). As a result, the molten mass separates from the short-circuited state, and the arc length increases. Therefore, the short-circuit-to-arc detector ( _12q ) is output from the arc length detector (12a). Detachment is detected from the arc length signal, and a SET signal is output to the control period X setter (12 k) composed of F / F. An ON signal is output to the switches (12 j) and (12ο).

After the above-mentioned detection, the comparator (12e) sets the arc length signal and the target arc length at each moment output from the arc length detector (12a). It compares with the instantaneous target arc length output from the heater (12c) and outputs the difference signal between each arc length to the arc current generator (100B) instantaneously. . The arc current generator (100B) adds or subtracts the difference signal to or from the current value set by the short-circuit current waveform setting device (3r), and converts the current value to a current value that can obtain the target arc length. And output to the adder (m) via the analog switch (12j), and the electric charge setting device (12) via the analog switch (12ο). Output to 12p). In the adder (12 m), the current changes to a short-circuit current, and the base current is superimposed on the corrected current value. It flows to the comparator (12n). On the other hand, the current waveform of the corrected input to the charge amount setter (12 p) is input to the integrator (12 p) comparators are converted to the charge amount of the current waveform in (12 p _3). In the comparator (12p ₃ ), the predetermined charge amount of the arc current set in advance by the predetermined charge amount setting device (12p ₂ ) and the charge amount input from the integrator (12 _{P l} ) When this charge amount becomes equal to the set charge amount, the integrator (12p) is reset and the F / F (12 Reset k) and set analog switches (12j) and (120) to 0FF. As a result, after detecting the detachment signal, an arc current of a predetermined charge amount is caused to flow to the wire electrode (52) to grow the molten mass to a constant molten capacity. Then, short-circuit the work (54). If this short-circuit condition is detected by the short-circuit arc detector (12q), the short-circuit current waveform for burning out the short-circuit molten mass is set to the short-circuit current waveform as described above. Output through the adder (12m) from the adder (12r). In this way, each time the detachment signal is output (Fig. 49 (A) (a)), a predetermined amount of arc current flows, and a molten mass with a constant melting capacity regularly short-circuits to the workpiece. And a good weld bead can be obtained.

In the above invention, when the output of the arc current having a predetermined charge amount is controlled after the detection of the detachment of the molten mass, the charge amount obtained by integrating the arc current waveform output every moment is obtained. The arc current output is stopped when a predetermined amount of electric charge is reached. However, after the detachment is detected as shown in Fig. 50 (A), the fixed time timer is activated. It is also possible to output a pulse current group during the operating time and to output an arc current with a constant charge. In the figure, (12a) is the same arc length detector as in the previous embodiment, (12b) is the same departure detection circuit, and (13) is the pulse current output period setting pulse generator. (14i) is the current waveform setting circuit according to this embodiment, and (14 ia) is the circuit configuration shown in (e) of FIG. 51 (A). A pulse waveform shaper that shapes and outputs the pulse current group waveform, (14) is a base current value setter that sets the base current value of the pulse current group, and (14c) is a pulse group. The pulse period setting unit that sets the pulse period for (14! D) is the pulse width setting that sets the pulse width (14 ie) is a pulse beak value setting device that sets the pulse beak value, (H) is a pulse group cycle setting device that sets the generation cycle of each pulse group, ( _14lS ) Turns on the pulse waveform shaper when the pulse group period signal is input, outputs the pulse current group, and sets the timer output set by the pulse period setting unit (13). Is 0 FF, and at the same time, the flip-flop operates the pulse current group at 0 FF.

 Next, the circuit operation based on the above configuration will be described with reference to signal waveform diagrams (a) to (e) of FIG. 51 (A).

First, if a periodic signal ((a) in the same figure) is output from the pulse group period setting device (14) to the flip-flop (14ig), the pulse waveform shaping is performed. (14 ia), base current value setting device (14 ib), pulse period setting device (14 ic), pulse width setting device (14xd), and pulse beak value setting device (14 ia) 14) Based on each set value by e), a pulse current group of a predetermined frequency having a constant pulse width and pulse beak value as shown in Fig. 7 (e) is superimposed on the base current. Generate and output. Next, when the detachment detection circuit (l ^ b) detects detachment based on the arc length signal output from the arc length detector (14 ₁₃ ), the detachment signal (Fig. ₁₃ (b)) Is output to a pulse period setting device (13) composed of a timer, and the timer output is turned on for a certain period of time ((c) in the same figure). ) To the negative reset terminal (-). Thereafter, the pulse waveform shaper (14a) outputs a timer output OFF signal ((d) in the same figure) when the pulse group period signal is input. Until the pulse current group is output. Therefore, from the pulse waveform shaper (14! A), a pulse current of a constant charge determined by the timer output time after the separation detection flows as the arc current. Therefore, the amount of melting of the molten mass after the detection of detachment is always constant, and the same effect as in the above embodiment can be obtained.

In the other embodiments described above, the pulse current group including a plurality of pulse currents has been described. However, even in the case of a single pulse current, the charge amount of the pulse current is also considered. Can be controlled. 50th Figure (B) is Ri Oh a current waveform setting circuit for a single Pulse current (14 _2), circuit (14 ₂₎ in, (14 _{2 a)} is Pulse peak value setter ( 14 Pulse current set peak value at ₂ c), base current value setting unit (14 ₂ b) 51 view for example by superimposing the set base current of (B) Pulse shaper you generate and output a Pulse current shown in _{(b), (14 2 d} ) are unfavorable blanking off Lock blanking decided rising period of each Pulse current ( It is a pulse cycle setting device that outputs a set signal to 14 ₂ e). The same reference numerals as those in FIG. 50 (A) denote the same or corresponding parts.

Next, the operation of this embodiment will be described with reference to the signal waveforms (a) and (b) of FIG. 51 (A). Pulse cycle setter for each to enter the (14 ₂ d) good Ri Pulse period signal (Fig. (A) is unfavorable blanking off Lock Bed (14 ₂ e), unfavorable Tsu Bed off b Bed (14 ₂ e) or al pulse waveform shaper (14 ₂ a) to operation signal is input, pulse current constant pulse beak value base current is superimposed with the Do one output When the pulse current is output, the detachment detection circuit (12b) If the detachment of the molten mass is detected based on the arc length signal input from the arc length detector (11a), the detachment signal (Fig. 12 (b) is used as a pulse period setting unit (13)) After the release signal is input, the timer outputs the timer output signal to the flip-flop for a fixed time (pulse period) and turns off the timer output. and you unfavorable blanking off Russia Uz Bed (14 ₂ e) good Ri pulse shaper that has been output the operation signal to the (14 ₂ a) to 0 FF also.

Result of this, the pulse waveform shaping unit (14 ₂ a) after leaving detection, you output Pulse current of a predetermined charge amount that Kima in pulse period Q (FIG. (B) as the arc current. Also, even if the separation time of the molten mass is delayed due to the magnetic blowing, a pulse current of a predetermined charge Q is passed after the separation is detected, so the melting capacity of the molten mass is almost separated After the same time as above, the molten mass separates, so that at the next detachment, the molten mass separates with a constant melting capacity at the normal separation time.

The arc length detector (11a) and leaving the detector (12b), and about the operation of the short-circuit arc judgment unit (9 _q), 52 view (a), see (b) and 48 view (B) It will be explained.

Arc length detector (12a), first arc current detected value entered by through insulation A down-flops (12a ₂₎ and (I) and enter to the multiplier (12 a _3), the function set in its this vessels (12a ₄₎ also calculates the function (I) which depends on current and function input Ri good, to enter the adder (12 a _6). Adder dc voltage constant to set the base voltage in _{(12 a 6) (K 2} ) is a DC constant setting unit (12a ₅₎ good Ri is input Because the Ru had adder (12 a ₆₎ or colleagues Ru is output to the comparator (12a ₇₎ is a reference arc voltage V _x rather如shown in FIG. 43. When the reference arc voltage V _x is set and input in this way, the arc voltage detection value (VJ is input according to the arc length that is sometimes obtained from the insulating embed (123 _l )). Then, based on the difference signal between the arc voltages (V _x ) and (VJ), an arc length signal () corresponding to the true arc length that changes every moment is output.

As shown in (a) of Fig. 52 (b), this arc length signal causes the signal length to rise sharply in the positive direction because the arc length increases when the molten mass separates from the molten mass. When a block is short-circuited, the signal level drops sharply in the negative direction because the arc length is narrow. Therefore, when the arc length signal is input to the differentiating circuit (121) of the detachment detector (12b), the positive differential signal as shown in (b) of Fig. 52 (b) is obtained when the molten mass is detached. Is output, and a differential signal in the negative direction is output when the molten mass is short-circuited. In the this you determine the sign les bell This is et differentiated signal with short-deviation judgment circuit (12b _3), separation of the molten mass, to determine the short-circuit state, withdrawal signal, short circuit signal (52 views (b ) Of (c) and (d) are output.

One is arc length signal L a (J2) 48 Figure short ♦ arc determiner shown in (B) (12 _q) of the short-circuit detector (12 _qi), leaving the detector (12 q ₂₎ Noso enter the re respectively, that have been entered in cell Tsu preparative terminal of the 52 view (b) Urn short signal by indicating in (d) of the unfavorable Tsu Bed off Lock Bed (12 q ₃₎ during, and outputs an output as the short-circuit determination signal, or leaving the detector (12 q ₂₎ good Ri withdrawal signal input to the Li cell Tsu Bok terminal At this time, the short-circuit judgment signal is set to 0 FF and output as the arc period judgment signal.

Claims

The scope of the claims

 1.When a plurality of pulse currents having one or more pulse widths and pulse beak values are arranged at one or more pulse intervals, and after a set time from the start of pulse transmission A pulse current group in which the average current value during the pulse group period is the maximum peak value, and the above pulse current group are repeated periodically, and a continuous base current is superimposed on this pulse current group. A pulse welding apparatus characterized by having a discharge current waveform formed as a result.

 2. The pulse welding apparatus according to claim 1, wherein the pulse current group is a pulse group cycle that sets a pulse group cycle according to a wire feed speed. Setting unit, pulse group period setting unit to set pulse group period, pulse group waveform setting unit to set pulse group waveform, pulse width of each pulse constituting pulse group waveform A pulse width setting device that sets the pulse period, a pulse period setting device that sets the pulse period of each pulse above, and a waveform based on the setting signal that receives the setting signal from each setting device A pulse waveform shaper that outputs a shaped pulse group current, a base current output device that outputs a base current superimposed on the pulse group current, and a base current that is output Pulse current composed of an adder that superimposes pulse group current with pulse current A pulse welding device characterized by being output from a waveform control circuit.

3. In the pulse welding apparatus as set forth in claim 2, the pulse group waveform setting device includes the pulse group periodic signal and the pulse group signal. Flip flops that input pulse group period signals and transmit signals between pulse groups, from the start of pulse group transmission until the pulse beak value is reached A volume that sets the time at which the molten mass separates, which is a time, a timer that operates based on the value set by the volume, and amplifies the output of the flip-flop A resistor, a capacitor, and a capacitor, which constitute a charging circuit when the output of the operational amplifier rises, and a discharging circuit, when the output falls, together with the capacitor. Resistance, the first transistor that controls the above-mentioned timer to turn on, the transistor for the charging circuit that switches and controls the time constants of the above-mentioned charge and discharge circuits, and the discharge Circuit transistor, inverts the above flip-flop signal and discharge circuit transistor It is characterized by having an inverting V-fan that performs GN control of the star and an inverting circuit that inverts the output of the operational amplifier and outputs an envelope signal of the pulse waveform of the pulse current. Pulse welding equipment.

 4. In the pulse welding apparatus according to claim 2 or 3, the pulse group period setting device is configured to control the pulse current group according to a wire feed speed. A pulse welding apparatus characterized by setting the pulse group cycle.

5. In the pulse welding apparatus according to any one of claims 1 to 4, the pulse interval of the pulse current group is set to a wire feed speed. A pulse welding machine characterized by being arranged in a distributed manner according to the pulse group cycle set in accordance with the pulse welding cycle.

6. In the pulse welding apparatus according to any one of claims 1 to 5, each pulse cycle of the pulse current group according to the wire feed speed. A pulse welding device characterized by having a pulse period setting device for setting the pulse period.

 7. In the pulse welding apparatus according to claim 6, the pulse cycle setting device operates based on the input of the pulse group cycle signal, and sends an H output after a set time to reset. A timer that is set and whose output is L, a first flip-flop that is reset based on the H output of the pulse group cycle, and a timer that resets The second flip-flop, the first and the second, which are set based on the H output of the signal and reset based on the pulse group period X signal. First and second pulse cycle setting devices for outputting first and second set values for setting the pulse cycle, respectively, and the first and second flip-flops described above. A first and a second analog switch, each of which is controlled to be switched based on the output of the switch, the first or second analog switch. The set value is compared with the integral output of the integrator that integrates the pulse period signal, and when the integral output reaches the first or second set value, the H output is sent out and the integrator is output. A pulse welding apparatus characterized in that it has a comparator that resets and controls the H output as a pulse period signal.

8. In the pulse welding apparatus as set forth in claim 7, the second pulse cycle setting device is configured to control a difference between a wire feed speed set value and a wire feed speed. Equipped with a differential to obtain differential output Pulse welding equipment characterized by the above features.

 9. In the pulse welding apparatus according to claim 7 or 8, the first pulse period setting device sets the first set value to a variable voltage by using a variable resistor. Pulse welding equipment characterized by this.

 10. In the pulse welding apparatus according to claim 7 or 8, the first pulse period setting device is configured to output a predetermined amplification factor to an output of the second pulse period setting device. Pulse welding equipment characterized in that it is an amplifier whose value is multiplied by A.

 1 1. In the pulse welding apparatus according to any one of claims 5 to 1Q, the pulse current waveform control circuit and the pulse waveform shaper output the pulse current. An integrator that integrates the pulse current group, a charge setter that sets the amount of charge according to the average voltage V sent from the average voltage V setter, and integration by the above integrator Compares the value with the charge set by the charge setter, and sends a reset signal to the integrator and pulse group period setter when the integrated value reaches the set charge. Pulse welding equipment characterized in that it has a pulse group charge amount setting device having a welding machine.

12. In the pulse welding apparatus according to any one of claims 1 to 11, the pulse current group corresponds to the pulse current in accordance with the wire feed speed. A pulse welding machine characterized in that it is dispersed and arranged at predetermined pulse intervals with different widths.

13. The pulse welding apparatus according to claim 12 operates based on the input of the pulse group periodic signal, and after a set time, outputs the H output to reset. The first flip-flop reset based on the H output of the pulse group period, and the H output of the timer The second flip-flop, which is set based on the pulse group period X and reset based on the X signal, sets the first and second pulse widths. The first and second pulse width setting devices that output the first and second set values respectively, based on the output of the first and second flip-flops The first and second analog switches, each of which is controlled by switching, the first and second set values of the first or second width setting device.The integrated output of the integrator that integrates the pulse period signal is compared, and when the integrated output reaches the first or second set value, the H output is sent to reset the integrator. A pulse width setting device having a comparator that outputs the H output as a pulse width signal together with the dot control and a pulse width signal. Welding equipment.

 14. The pulse welding apparatus according to claim 13, wherein the first pulse width setting device includes a setting device for setting the wire feeding speed and a wire feeding device. A pulse welding apparatus comprising a differential for obtaining a differential output between a set value of a feeding speed and a wire feeding speed.

15. In the pulse welding apparatus according to any one of claims 1 to 14, the pulse current group is a wire current. A pulse welding apparatus characterized in that a gradient of an average current value forming a beak is variably controlled according to a set value of a feed rate or an average voltage.

 16. The pulse welding apparatus according to claim 15, wherein the pulse group waveform setting device obtains a mountain-shaped reference pulse group waveform P, and a reference pulse group waveform setting device. It has a pulse group waveform gradient variable device and an adder that changes the slope of the chevron shape of the pulse group waveform according to the wire feed speed and the arc average voltage. Pulse welding equipment.

17. In the pulse welding apparatus as set forth in claim 16, the reference pulse group waveform setting device is configured to operate from the start of pulse group transmission until the pulse beak value is reached. A timer that operates based on the value set by the volume that sets the time at which the molten mass separates, an amplifier that amplifies the pulse group period signal, and this amplifier The resistor and the capacitor that constitute the charging circuit when the output rises, and the resistor that constitutes the discharging circuit when the output falls together with the capacitor, and the resistor that constitutes the charging circuit when the output falls A transistor for a charging circuit that is connected in parallel with a sensor, a transistor for a discharging circuit that short-circuits a resistor constituting the discharging circuit and makes the output of the amplifier zero, A transistor for controlling the amplifier input based on a timer output, An inverting buffer for inputting the 0N signal to the discharge circuit transistor, a volume, an adder, and an adder for obtaining an additional output when the output rises. Must have a transistor for output control A pulse welding device characterized by the following.

 18. In the pulse welding apparatus according to claim 16 or 17, the pulse group waveform gradient variable device integrates the pulse group period signal and sends an integrated signal. The integrator to be output, the wire feed speed and the average voltage are added and amplified, and the amplifier that sends out the added amplified signal.The integrated signal becomes equal to the added amplified signal. A comparator that sends a time coincidence signal is set based on the pulse group period signal, and a reset signal is sent out along with the set signal and reset based on the coincidence signal of the comparator. It is a flip-flop, a resistor and a capacitor. It is a first charging circuit that inputs and charges the above set signal, and is not a resistor and a capacitor. A discharge circuit that discharges the output, and a signal T that is made up of a resistor and a capacitor You charging again by the second charging circuit, pulse welding equipment it characterized that you have have a A down-flop you sends gradient variable signal Ru changing the slope of the pulse group waveform.

 19. In the pulse welding apparatus according to any one of claims 1 to 18, the pulse intervals of the pulse current group are distributed in accordance with the pulse group period. Pulse welding equipment that is characterized by what it does.

20. The pulse welding apparatus according to claim 19, which operates based on the input of the pulse group periodic signal, and outputs the H output after a set time to reset. When this is done, the timer whose output becomes L is set based on the above pulse group periodic signal. The first flip-flop which is reset based on the H output of the timer and the pulse group periodic signal which is set based on the H output of the timer A second flip-flop which is reset based on the first and second pulse periods based on the pulse group periodic signal. The first and second pulse period setting devices output the set values of the respective switches, and the switches are respectively set based on the outputs of the first and second flip-flops. The first and second analog switches to be controlled by the pitching and the first and second pulse period setting devices of the first and second pulse period setting devices are integrated with the pulse period signal. When the integrated output reaches the first or second set value, an H output is sent out to reset the integrator when the integrated output reaches the first or second set value. DOO control to that the pulse welding device you characterized and this having a pulse cycle setter for the H output of its was closed comparator you output as pulse cycle signal co.

 21. The pulse welding apparatus according to claim 20, further comprising: a second pulse cycle setter, a setter for setting a voltage of the pulse group cycle reference signal and transmitting the signal. An F / V converter that converts a pulse group periodic signal into a frequency voltage and outputs a converted voltage value, and a differential device that obtains a differential output between the voltage set value and the converted voltage value. A pulse welding device characterized by and.

22. In the pulse welding apparatus according to claim 20 or 21, the first pulse period setting device transmits the pulse group period reference signal to a variable resistor. It is especially important to set the voltage Characteristic pulse welding equipment.

 23. In the pulse welding apparatus according to any one of claims 20 to 22, the first pulse cycle setting device is the second pulse cycle setting device. Pulse welding equipment characterized in that the output is multiplied by a predetermined amplification factor A to make the amplifier a value.

24. In the pulse welding apparatus according to any one of claims 19 to 23, the energy or the power by the pulse current group during the pulse current group cycle period. A pulse welding apparatus characterized by having means for substantially stabilizing the electric charge of a pulse current group to a predetermined value.

 25. In the pulse welding apparatus according to claim 24, an integrator that integrates a pulse current group output from the pulse waveform shaper, and an average voltage V setting device. A charge amount setting device in which the charge amount is set in accordance with the average voltage V sent from the device, a comparison is made between the integration value obtained by the integrator and the charge amount set by the charge amount setting device, and integration is performed. A pulse group charge amount setting device having a comparator for sending a reset signal to the integrator and the pulse group period setting device when the value reaches the set charge amount. Characteristic pulse welding equipment.

26. In the pulse welding apparatus according to claim 1, at least one of the pulse interval, the pulse width, or the pulse cycle of the pulse current group is determined by a wire. Do not disperse and arrange by synchronizing with the separation of the molten mass at the electrode tip. Pulse welding equipment characterized in that:

 27. In the pulse welding apparatus according to claim 26, the pulse current waveform control circuit may be configured to connect the tip of the wire electrode to the shield based on the arc current value I and the arc detection voltage value V. An arc length detector that detects the arc length L between the welded objects, a signal that separates the molten mass is obtained based on the arc length detection value L detected by the arc length detector, and the pulse period of the separation detection signal is set. Pulse welding equipment characterized in that it has a detachment detector that variably controls the pulse cycle of the pulse group period that is output to the detector.

28. In the pulse welding apparatus according to claim 26 or 27, the arc length detector is provided with a first insulating amplifier for inputting an arc detection current. The arc detection current i is taken through the second insulation amplifier and the first insulation amplifier for inputting the arc detection voltage, and Kt (i) multiplied by Ki (i). ) ♦ i look Ru multiplier, off Se Tsu G voltage constant K ₂ direct current compress number setter to set the adder you adds the output of the DC voltage constant setter the multiplier, and its By comparing the sum output V _x = (i) · i + K ₂ with the arc detection voltage V, the comparison output L (J2) = V — V _{x corresponding} to the arc length is sent out. A pulse welding apparatus comprising: a comparator;

29. In the pulse welding apparatus according to any one of claims 26 to 28, the pulse cycle setting device is set based on a pulse group cycle signal. The first flip-flop that is reset based on the detection signal of the detachment detector Bed, second full Clip off Lock up that will be re-Se Tsu preparative based on the detection signal d _f of the withdrawal detectors, first and second pulse period C _{A 1,} C _{A 2} First and second pulse period setting devices that output first and second set values for setting, respectively, and output of the first and second flip flops The first and second analog switches, each of which is controlled to be switched based on the force, of the first or second pulse period setting device. first, when the integrated output V _Q integration outputs comparison of the integrator you integrating the second set value and the pulse period signal was the first or that reached the second set value V _{a A} comparator (86h) that sends the H output and resets the integrator (86g) and outputs the H output as a pulse period signal CA It is noted that It shall be the Pulse welding equipment.

 30. In the pulse welding apparatus according to claim 1, at least one of the pulse intervals, the pulse width, or the pulse cycle of the pulse current group is set to the pulse welding apparatus. A pulse welding device that is characterized in that it is arranged in a distributed manner by changing the pulse after a preset time from the start of pulse delivery of the pulse group.

3 1. In the pulse welding apparatus described in claim 3Q, a timer that outputs H output after a set time and outputs when resetting, The first flip-flop, which is set based on the pulse group periodic signal and reset based on the H output of the timer, It is set based on the H output of the signal and reset based on the pulse group period signal. The first and second set values for setting the second flip-flop (86c), the first and second pulse periods C _A1 and C _A2 , respectively. The first and second pulse period setting devices to be output and output are respectively controlled based on the outputs of the first and second free probes. Integration of the first and second analog switches, the first and second set values of the first or second pulse period setter, and the integrator that integrates the pulse period signal integrated output V _Q output by comparing the above first or is sent the H output of its both when you re Se Tsu preparative controlling said integrator when reached the second set value V _a A pulse welding device characterized by having a pulse period setting device with a comparator (86 h) that outputs the H output as a pulse period signal.

 3 2. A pulse current whose current value becomes a beak value after the set time and this pulse current are repeated periodically, and a continuous base current is superimposed on this pulse current to form a pulse current. A pulse welding apparatus characterized by having a discharge current waveform.

 33. In the pulse welding apparatus according to claim 32, the pulse current becomes a peak value after a set time and the wire feed speed is reduced. A pulse welding apparatus characterized in that a gradient of an average current value for forming a beak is variably controlled according to an average voltage value.

34. In the pulse welding apparatus as set forth in claim 32 or 33, the pulse current is set to rise from the start of sending the pulse current and a gradient of a level change is provided. With the withdrawal signal A pulse current waveform control circuit configured to provide a slope of a falling level change in synchronization with the detachment of the molten mass at the tip of the input coil electrode. Loose welding equipment.

3 5. At the Pulse welding device according to the third item 4 claims, the pulse current waveform control circuit, row output control of pulse groups periodic signals C _B and Pulse group period signal A first flip-flop, a resistor and a capacitor (:, and an operational amplifier) that integrate the output of the first flip-flop. From the first transistor and the resistor, which discharge through the electric charge stored in the capacitor constituting the integrating circuit. A discharge circuit configured, a second transistor for short-circuit control of the input / output terminals of the above-mentioned operational amplifier, and a second transistor for ON-operation control of the first transistor Except for the flip-flop, the inverter for controlling the above-mentioned second transistor to operate 0N, and the pulse group period signal X input, the first Rib mouth, third transistor to lower the output level of the jib to the ground potential, reset signal input of the first and second flip-flops Pulse group waveform setting with an inversion circuit that inverts the first and second notches and the operational amplifier output and outputs it to the pulse waveform shaper (15a) Pulse welding equipment characterized by having a vessel.

36. In the pulse welding apparatus according to any one of claims 32 to 35, the pulse current waveform control circuit sets a cycle of a single pulse. Pulse cycle setting device and valve Pulse welding equipment characterized by having a pulse width setting device for setting the pulse width, that is, the pulse output period.

 37. In the pulse welding apparatus according to any one of claims 34 to 36, an integrated charge amount of an arc current supplied after detection of detachment of the molten mass is obtained. Means, an arc current supply control unit for stopping the pulse current group or the pulse current based on a comparison between the integrated charge amount and the predetermined charge amount, and resetting and controlling the means for obtaining the integrated charge amount. A pulse welding apparatus characterized by having:

3 8. The pulse current waveform control circuit that generates and outputs pulse current groups or pulse currents detects the arc length every moment and outputs the arc length signal. Detector that detects the detachment of the molten mass from the arc length signal and outputs a detection signal, Target arc length setting device that sets the target arc length that changes every moment, Arc length every moment A comparator that compares the signal with the target arc length and outputs a difference signal, a pulse group current generator that sets the reference pulse current waveform, and a pulse current group that depends on the wire feed speed Current waveform period setting device that sets the output period, current waveform period setting device that sets ON every cycle C _B and outputs an ON signal to the analog switch, separation detection signal input At the same time, it goes into the set state and analog switch A base current output device that outputs a base current to be superimposed on a pulse current group, and a base current output device that outputs a base current to be superimposed on a pulse current group Adder that superimposes The comparator A compares the pulse current to be output with the arc current detection value, and, based on the comparison result, turns on and off the inverter drive circuit. A pulse welding device characterized by comprising a charge setting device for setting the pressure.

 39. The charge amount setting device according to claim 38 is an integrator that integrates the pulse current group after separation detection to obtain the charge amount, and determines the charge amount of the pulse current group that flows after the separation detection in advance. Predetermined charge setter to be set, current waveform period when the amount of charge of the pulse current group to be output reaches the specified charge X setter (9i) Comparison that outputs a reset signal A pulse welding apparatus characterized by comprising a vessel B.

 40. In the pulse welding apparatus according to any one of claims 37 to 39, an arc length between the wire electrode tip and a workpiece to be welded is detected. An arc length detector, a short circuit that determines the short-circuit of the molten mass and the arc period based on at least the arc length signal, an arc detector, and a short-circuit current waveform that short-circuits the supply current in the event of a short-circuit A pulse welding apparatus characterized by comprising a setting device.