WO1990009858A1 - Appareil de soudage a impulsions - Google Patents

Appareil de soudage a impulsions Download PDF

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Publication number
WO1990009858A1
WO1990009858A1 PCT/JP1990/000247 JP9000247W WO9009858A1 WO 1990009858 A1 WO1990009858 A1 WO 1990009858A1 JP 9000247 W JP9000247 W JP 9000247W WO 9009858 A1 WO9009858 A1 WO 9009858A1
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WO
WIPO (PCT)
Prior art keywords
pulse
output
current
signal
group
Prior art date
Application number
PCT/JP1990/000247
Other languages
English (en)
Japanese (ja)
Inventor
Yoichiro Tabata
Shigeo Ueguri
Yoshihiro Ueda
Masanori Mizuno
Yoshiaki Katou
Osamu Nagano
Original Assignee
Mitsubishi Denki Kabushiki Kaisha
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Denki Kabushiki Kaisha filed Critical Mitsubishi Denki Kabushiki Kaisha
Publication of WO1990009858A1 publication Critical patent/WO1990009858A1/fr
Priority to GB9025723A priority Critical patent/GB2240888B/en

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Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/02—Regulating electric characteristics of arcs
    • G05F1/08—Regulating electric characteristics of arcs by means of semiconductor devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/09—Arrangements or circuits for arc welding with pulsed current or voltage
    • B23K9/091—Arrangements or circuits for arc welding with pulsed current or voltage characterised by the circuits
    • B23K9/093—Arrangements or circuits for arc welding with pulsed current or voltage characterised by the circuits the frequency of the pulses produced being modulatable

Definitions

  • 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.
  • pulse arc welding equipment 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • (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.
  • 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.
  • (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
  • (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.
  • 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 mm ⁇ , 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.
  • 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.
  • (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).
  • 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
  • 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.
  • 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).
  • 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.
  • a current waveform as shown in FIG. 54 (b) is obtained, and a stable welding state is maintained.
  • 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.
  • 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.
  • 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)
  • (53) is a wire electrode.
  • (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.
  • 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.
  • I P is the pulse Bee leakage current value
  • Te is pulse width
  • T A is the pulse interval
  • CA is Repetitive cycles of pulse current
  • IB is the base current value
  • T B is Ru Ah in Repetitive cycles of Repetitive interval
  • 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.
  • 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.
  • 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.
  • a pulse consisting of multiple pulse currents with a pulse interval TA and pulse width ⁇ is set. and this to repeat the current group X at every constant period C B is Ru Oh needed.
  • the arc from the welding torch and the arc from the arc to the workpiece 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.
  • the arc length increases because the molten mass is lifted by the deflected arc.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • Japanese Patent Application No. 63-265083 Japanese Patent Application No. 63-265083
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • the arc length at every moment is the target arc.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • the purpose is to obtain a pulse welding apparatus capable of obtaining a uniform weld bead.
  • the purpose is to obtain a pulse welding apparatus that can obtain a uniform welding bead.
  • 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.
  • the pulse transmission starts from the start of pulse transmission.
  • 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.
  • 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
  • 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
  • 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.
  • 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.
  • a plurality of pulse currents having one or more pulse widths and pulse beak values are not arranged at one or more pulse intervals.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • FIG. 1 is a block diagram showing a pulse welding apparatus according to an embodiment of the first invention
  • 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
  • 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
  • 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. 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
  • 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
  • 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
  • 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
  • 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
  • FIGS. 26 (a) and (b) are FIG.
  • 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 C ⁇ 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.
  • 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
  • FIG. 38 is a circuit diagram showing a pulse cycle CA setting device shown in FIG. 37
  • 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
  • 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.
  • FIG. 43 is an arc voltage-current characteristic diagram for explaining the arc length detection operation
  • 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
  • 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
  • Fig. 48 (B) is a short-circuit arc.
  • FIGS. 49 (A) and (B) are diagrams showing the configuration of the judgment device, and FIGS.
  • FIG. 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.
  • FIG. 51 is a pulse waveform diagram for explaining these other embodiments
  • 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
  • Fig. 54 (a) is an arc current waveform diagram for conventional arc welding.
  • FIG. 55 Arc current waveform diagram during short-circuit transfer welding
  • FIG. 55 (a).
  • Fig. 56 Fig. 57 is a pulse arc current waveform diagram of a conventional pulse arc welding device
  • 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.
  • FIG. 1 is an overall configuration diagram of the apparatus of this embodiment.
  • (1) indicates the inverter drive circuit.
  • 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.
  • (6) a current detector for detecting the pulse group current
  • (7) a voltage detector for detecting the voltage between the electrodes
  • 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).
  • Na Contact (9) and (10) controls the word i catcher feed ⁇ 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.
  • 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.
  • 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
  • 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).
  • 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).
  • T A is a pulse interval in the pulse group period X
  • T B is a repetition interval in the pulse group period X.
  • 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.
  • 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).
  • 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.
  • 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.
  • 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.
  • the pulse group waveform is gradually increased as the pulse group waveform, and the peak value is decreased after the time Tc.
  • the peak beak value of the pulse only around the time Tc may be increased as shown in Fig. 4.
  • 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.
  • 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.
  • the pulse arc welding apparatus using the pulse group waveform was described.
  • a single pulse welding apparatus was used. Pulse welding equipment that performs periodic repetition of the pulse current waveform may be used.
  • 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 ⁇ 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 given instead each pulse period C A and pulse width Ri ⁇ of pulse groups period CB and the pulse group duration X.
  • 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 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.
  • shield gas 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.
  • 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 ⁇ (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.
  • 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 )
  • 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.
  • 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
  • C B setter (82) is Se Tsu Bok.
  • the pulse period C A setter (86), depending on the Re this-out based on the input of the word i ya feed ⁇ 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.
  • 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 3 ⁇ 4 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
  • Wa Lee turbocharger feeding speed Vw is set value
  • the differential output V A — Vw which is inversely proportional to the wire feed speed
  • the pulse period C A is lengthened accordingly.
  • the pulse pause period base current period
  • 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.
  • pulse group periodic C B signal is Se Tsu preparative terminal of the first full Clip off Lock flop (86 b)
  • the first full Clip off Russia-up (86 b) is Se Tsu door
  • the analog switch (86f) conducts due to the bell
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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
  • pulse group period X pulse group period
  • pulse group waveform envelope waveform
  • pulse period C pulse waveform shaper
  • 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.
  • a shaped AC waveform is output to the high-frequency transformer (3).
  • 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.
  • 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.
  • 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.
  • 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.
  • GAi relatively short pulse period signal
  • 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.
  • the molten mass is newly lifted to the tip end of the wire electrode again by the pulse group.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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 ⁇ 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.
  • 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.
  • 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.
  • 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.)
  • 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 (85 ⁇ ) 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).
  • 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 ⁇ ! 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.
  • 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 ⁇ 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 ⁇ 2 of the Soviet Union that are controlled Let 's that Do rather narrow.
  • the first pulse width i The signal and pulse period CA are always controlled at a fixed timing.
  • the pulse interval is dispersed in accordance with the wire feed speed, and the pulse interval is dispersed in the pulse group.
  • the pulse interval is dispersed in the pulse group.
  • 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.
  • the pulse width ⁇ in the pulse group is represented by ⁇ i in accordance with the wire feed speed.
  • FIG. 19 is a block diagram showing a pulse welding apparatus according to one embodiment of the sixth invention.
  • the same symbols as in Fig. 14 are the same. -, Or indicates a substantial part.
  • (84 J is a pulse group waveform Mi setting device in the present embodiment.
  • 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.
  • 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 (84 ⁇ )
  • 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 (84 ⁇ ) Yes.
  • the pulse group waveform gradient variable unit (84B) is an integrator that integrates the pulse group period X signal and outputs the signal x .
  • the timer (84Ab) is set based on the pulse group period X signal.
  • 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
  • a down-flops (the output signal of 8 4d) are you to best match the attenuation in the resistor (84Ac).
  • 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).
  • 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).
  • 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.
  • 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.
  • 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 ⁇ 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.
  • 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).
  • this chevron-shaped envelope Mi signal is output to the pulse waveform shaper (81).
  • 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.
  • 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.
  • the pulse group waveform M i is ⁇ 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 J3 ⁇ 4. It can be prevented from occurring.
  • 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 )
  • 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.
  • 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) .
  • 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.
  • the inverter drive signal is generated. It is transmitted from the inverter drive circuit (2) to the inverter circuit (1) and drives the inverter.
  • a shaped AC waveform is output to the high-frequency transformer (3).
  • 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).
  • 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.
  • 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.
  • 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 ⁇ 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.
  • 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.
  • 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.
  • FIG. 25 shows an embodiment of the pulse welding apparatus according to the seventh invention for performing ⁇ pulse arc welding by obtaining a single pulse current waveform.
  • Pulse current waveform control circuit in this embodiment that you only (8), ⁇ 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.
  • 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.
  • 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 ⁇ 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.
  • 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.
  • 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.
  • 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
  • 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.
  • the same reference numerals as those in FIG. 1 indicate the same or corresponding parts.
  • (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.
  • 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)
  • 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 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.
  • 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.
  • 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.
  • 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.
  • 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)
  • 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.
  • 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 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.
  • the pulse interval is varied and distributed control is performed.
  • pulse group period X setter (83), pulse group waveform Mi setter (84 2), pulse width ⁇ 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.
  • the non-Clip off Russia-up a such that pulse group period X set Joki (83) of the ring Lee Ya send ⁇ 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 ⁇ Pi pulse group period X signal Send output based on J
  • 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.
  • 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.
  • 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).
  • 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.
  • 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.
  • 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).
  • the wire during pulse arc welding is generated.
  • 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.
  • 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.
  • 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.
  • U 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 ⁇ .
  • 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
  • this pulse current group is a discharge current waveform that repeats periodically. Therefore, it acts to reduce the force for lifting the molten mass formed at the tip of the wire electrode.
  • 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.
  • 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.
  • 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.
  • 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.
  • the growth rate of the molten mass can be controlled according to the pulse group period.
  • 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.
  • the same reference numerals as those in Fig. 1 indicate the same or almost corresponding parts.
  • 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.
  • the arc length detector (90) detects the detection current i via the insulation amplifiers (90a) and (90b) and the insulation amplifier (90a).
  • 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.
  • R (i) the positive characteristic constant of the arc
  • A the proportional constant to the arc length
  • J £ the arc length
  • B the minimum voltage.
  • 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
  • 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.
  • 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.
  • 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.
  • 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.
  • 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 ⁇ is Ri by the and this H Les Bell and ing
  • the analog switch (86 ⁇ ) 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.
  • 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.
  • 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 ⁇ 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.
  • 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) ⁇ 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).
  • 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.
  • 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.
  • the pulse period G A within the pulse group period X sent from the pulse waveform shaper (81) is used.
  • 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.
  • 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.
  • 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.
  • 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.
  • the pulse arc welding apparatus has been described.
  • 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.
  • the same reference numerals as those in FIG. 1 indicate the same or corresponding parts.
  • 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.
  • 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 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.
  • 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.
  • 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.
  • the pulse interval is varied and the dispersion control is performed.
  • 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 faithful No. and Ru sending a Pulse period C A signal Pulse wave ⁇ form device in (81).
  • 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.
  • 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).
  • 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.
  • 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
  • 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.
  • Tc from the It can be released to the object side.
  • 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.
  • 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.
  • the arc length is the allowable arc length J2 at which undercut does not occur. It is surely suppressed to the following value ⁇ .
  • 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.
  • 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.
  • 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 ⁇ 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.
  • the pulse arc welding apparatus has been described.
  • 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.
  • 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.
  • FIG. 41 is an overall configuration diagram of a pulse arc welding apparatus according to an embodiment of the invention of FIG.
  • 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.
  • (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.
  • (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.
  • (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 ⁇ 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 ⁇ ⁇ 2 (87 ⁇ ) is controlled by 0 ⁇ , and (87 ii) is the pulse group period signal. Except for the signal X input, the transistor 3 (hereinafter abbreviated as ⁇ ⁇ 3 ), which lowers the output level of F / F 1 (87i) to the earth potential , (87!
  • (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).
  • 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 £))
  • the release signal is output to F / F 2 (87 9 ) ((b) in the same figure)
  • the / signal is input to ⁇ 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).
  • capacitor C (87 4) to the stored al charge resistors R 3 (87 6) and co-standard test ' is the signal A (L (J £)
  • 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).
  • inverted Pulse group period signal X is "H" Ri by Les Bell “L” Les Bell
  • 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.
  • 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)
  • 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).
  • the pulse envelope signal Es is formed by the pulse group waveform gradient setting device (87)
  • 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.
  • 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 .
  • 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.
  • Fig. 45 shows a circuit configuration for performing this function. There are the following.
  • 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. .
  • 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 ⁇ rather reference arc voltage V x as shown in figure Ru is output to the comparator (92 g).
  • FIG. 46 is a block diagram of one embodiment of the thirteenth invention.
  • 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.
  • (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
  • (12b) is a delamination detection that detects the detachment of the molten mass from the arc length signal and outputs a detection signal.
  • 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 (12 ⁇ ) 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 (12 ⁇ ) 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) ⁇ ) 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.
  • 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 (12 ⁇ ) as an arc current reference value.
  • the comparator C (12 ⁇ ) 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).
  • the operation OFF signal is output to the inverter drive circuit (2).
  • the F / F (12k) is set and the analog switch (12 ⁇ ) is turned on.
  • the pulse current waveform output from the analog switch (12j) is input to the charge amount setting device (12b).
  • 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. (12 ⁇ ).
  • 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 (12 ⁇ ).
  • 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 (12 ⁇ ). Output to 12p).
  • 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).
  • 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).
  • 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.
  • 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.
  • 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.
  • (12a) is the same arc length detector as in the previous embodiment
  • (12b) is the same departure detection circuit
  • (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.
  • 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.
  • 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.
  • 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).
  • 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!
  • 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.
  • 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.
  • the timer 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.
  • 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.
  • 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 ⁇ shown in FIG. 43.
  • 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.
  • 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.
  • 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.

Abstract

Dans un appareil de soudage à impulsions effectuant par exemple le soudage à l'arc ou le soudage à l'arc à court-circuit en utilisant une décharge d'impulsions qui se produit à la pointe de la baguette d'apport, la formation de sillons, qui sont des défauts apparaissant dans la forme des cordons de soudage, détériore la qualité du soudage, lorsque la synchronisation pour le retrait de la masse fondue s'étant accumulée à la pointe de la baguette d'apport est retardée en raison d'une modification des conditions de soudage ou d'une perturbation de ces conditions. Pour éliminer ces défauts, le courant pulsé appliqué au matériau à souder est divisé en plusieurs groupes d'impulsions, les groupes d'impulsions sont autorisés à contenir un courant moyen d'une amplitude maximale à l'échéance d'une période prédéterminée comptée à partir du début de l'impulsion, les groupes du courant pulsé sont autorisés à présenter une forme de montagne adaptée au phénomène de retrait de la masse fondue, et la période des impulsions, à la largeur des impulsions et l'espace libre entre les impulsions des groupes du courant pulsé sont modifiés en fonction de la vitesse d'apport de la baguette ou de la période des groupes d'impulsions. En outre, dans le procédé de soudage à l'arc à court-circuit, les périodes du court-circuit et de la formation de l'arc sont commandées instantanément en fonction de la longueur d'arc détectée ou de la vistesse d'apport de la baguette, de façon à permettre l'obtention rapide de la longueur d'arc. Ainsi, la masse fondue peut être retirée régulièrement et appliquée par déplacement sur le matériau à souder. En outre, lors du soudage à l'arc à court-circuit, les variations diminuent entre la période de court-circuit et la période de formation de l'arc. Par conséquent, la croissance et le retrait de la masse en fusion peuvent être commandés indépendamment du phénomène de soufflage magnétique de l'arc, et un soudage favorable est obtenu, ce qui améliore la qualité sans que celle-ci soit influencée par un changement de forme de la jointure de soudage et par une variation du point de mise à la terre dans l'arc réel.
PCT/JP1990/000247 1989-02-27 1990-02-27 Appareil de soudage a impulsions WO1990009858A1 (fr)

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DE4216594A1 (de) * 1992-05-20 1993-11-25 Kabelmetal Electro Gmbh Verfahren zur Regelung des Schweißstromes in Abhängigkeit der Schweißgeschwindigkeit bei Lichtbogenschweißeinrichtungen

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JPS6154512B2 (fr) * 1978-02-01 1986-11-22 Honda Motor Co Ltd
JPS61266180A (ja) * 1985-05-20 1986-11-25 Toyota Motor Corp ア−ク溶接装置
JPS6245025B2 (fr) * 1981-01-14 1987-09-24 Sansha Electric Mfg Co Ltd
JPS6254585B2 (fr) * 1981-04-10 1987-11-16 Mitsubishi Electric Corp
JPS6348633B2 (fr) * 1980-07-08 1988-09-29 Mitsubishi Electric Corp
JPS6356029B2 (fr) * 1979-11-07 1988-11-07 Mitsubishi Electric Corp
JPH01254385A (ja) * 1987-12-09 1989-10-11 Mitsubishi Electric Corp パルス溶接装置

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JPS56139286A (en) * 1980-03-31 1981-10-30 Mitsubishi Electric Corp Pulse arc welding equipment
DE3213278A1 (de) * 1981-04-10 1982-11-18 Mitsubishi Denki K.K., Tokyo Mit kurzschluss arbeitende lichtbogen-uebertragschweissmaschine
JPS58116164U (ja) * 1982-01-22 1983-08-08 株式会社ダイヘン ア−ク溶接機
US4866247A (en) * 1986-12-11 1989-09-12 The Lincoln Electric Company Apparatus and method of short circuiting arc welding
US4994646A (en) * 1988-05-19 1991-02-19 Mitsubishi Denki Kabushiki Kaisha Pulse arc discharge welding apparatus
WO1990009857A1 (fr) * 1989-02-28 1990-09-07 Mitsubishi Denki Kabushiki Kaisha Appareil de soudage a impulsions
JPH10254385A (ja) * 1997-03-11 1998-09-25 Stanley Electric Co Ltd Ｌｅｄドットマトリクス表示装置及びその階調表示方法
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JPS6154512B2 (fr) * 1978-02-01 1986-11-22 Honda Motor Co Ltd
JPS6356029B2 (fr) * 1979-11-07 1988-11-07 Mitsubishi Electric Corp
JPS6348633B2 (fr) * 1980-07-08 1988-09-29 Mitsubishi Electric Corp
JPS6245025B2 (fr) * 1981-01-14 1987-09-24 Sansha Electric Mfg Co Ltd
JPS6254585B2 (fr) * 1981-04-10 1987-11-16 Mitsubishi Electric Corp
JPS61266180A (ja) * 1985-05-20 1986-11-25 Toyota Motor Corp ア−ク溶接装置
JPH01254385A (ja) * 1987-12-09 1989-10-11 Mitsubishi Electric Corp パルス溶接装置

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