TWI422455B - Stitch pulse welding method - Google Patents

Description

Pin pulse welding method

The present invention relates to a stitch pulse welding method, and more particularly to a stitch pulse welding method which can improve the appearance after welding and reduce the amount of deformation caused by welding.

The stitch pulse welding method refers to a welding method that controls the heating and cooling at the time of welding to minimize the influence on the heat applied to the base material. For example, Japanese Patent Publication No. Hei 6-55268 discloses a welding method for the purpose of automation of thin plate welding. According to the welding method disclosed in this document, the appearance after welding can be improved and the amount of deformation due to welding can be reduced as compared with the conventional thin plate welding.

The means disclosed in this document is that an arc is generated for a predetermined time in a state in which the welder is stopped to melt the welded base material, and after the set time elapses, the arc is stopped and the welder is moved to the outside of the molten portion. The arc near the edge starts again.

Next, refer to the ninth diagram to explain this prior art.

As shown in the ninth figure, the operator M automatically performs arc welding for the finished product W. The manipulator M is provided with an upper arm 53, a lower arm 54, a wrist 55, and a plurality of servo motors (not shown) that drive the rotation of the three.

The arc welder T is mounted at the tip end of the upper arm 53 of the operator M. The arc welder T guides the weld line 57 having a diameter of about 1 mm wound by the bobbin 56 to the welding position taught by the finished product W. The welding power source WP supplies a welding power source between the arc welder T and the finished product W. At the time of welding the finished product W, the weld line 57 protrudes from the tip end of the arc welder T by a desired length Ew. Generally, the length Ew is about 15 mm. The operator adjusts the length Ew to a desired length by using a teaching pendant TP as an operating means in accordance with the groove shape and welding conditions of the welded portion.

A coil liner for guiding the weld line 57 is provided inside the conduit cable 52. The conduit cable 52 is connected to the arc welder T. The conduit cable 52 supplies electric power from the welding power source WP and shielding gas from the gas compression cylinder 58 to the arc welder T.

The teaching suspension system TP is a so-called portable operating panel. The teaching suspension system TP is used to set the conditions necessary for the operation of the operator M and the pulse welding of the stitches, specifically, the welding current, the welding voltage, the moving speed, the moving interval, the welding time, the cooling time, and the like. . The operator uses the teaching suspension system TP to create an operation program for setting the above various conditions in accordance with the operation of the operator M.

The machine control device RC controls the welding operation of the operator M. The machine control device RC includes a main control unit, an operation control unit, and a servo driver (not shown). The operator outputs an operation control signal to each servo motor of the operator M by the servo driver based on the operation program taught by the teaching suspension system TP, so that the plurality of axes of the operator M are respectively rotated. The servo motor of the operator M is equipped with an encoder (not shown). The machine control unit RC uses the output signal from the encoder to know the current position of the arc welder T. Therefore, the machine control device RC can control the position of the tip end of the arc welder T. The machine control device RC performs stitch pulse welding in the welded portion while repeating the welding, moving, and cooling described below.

Next, refer to the tenth figure to explain the pin pulse welding.

The weld line 57 protrudes from the tip end of the arc welder T. The shielding gas G is blown out from the arc welder T at a constant flow rate from the start of welding until the end of welding.

(a) of the tenth figure shows how the arc is generated. An arc A is generated between the tip end of the weld line 57 and the finished product W at the arc start point based on the set welding current and the welding voltage. On the finished product W, the weld line 57 is melted to produce the molten pool Y. Starting from the generation of the arc A, the arc A is stopped after the set welding time has elapsed.

(b) of the tenth figure shows the state after the arc is stopped. After the arc is stopped, the state after welding is maintained until the set cooling time elapses. In other words, in a state where the operator M and the arc welder T are stopped in the same manner as in the welding, only the shielding gas G is blown out from the arc welder T. The molten pool Y is substantially solidified by cooling of the shielding gas G.

(c) of the tenth figure shows how the arc welder T is moved to the next welding position. After the cooling time has elapsed, the arc welder T is moved in the direction of welding. Thereby, the arc welder T moves to an arc restart point which deviates from the arc start point only by the preset movement interval Mp. The moving speed at this time is set in advance. The moving interval Mp is the same as the moving distance of the welding line 57 on the outer circumference of the weld mark Y' from the start point of the arc until the molten pool Y is solidified, as shown in Fig. 10(c).

(d) of the tenth graph shows how the arc A is regenerated in the arc restart point. At the end of the weld mark Y', the molten pool Y" is newly formed and welded. Thus, in the stitch pulse welding device 51, the state in which the arc is generated and welded, and the state of cooling and moving are alternately repeated. Yes, the weld marks are overlapped into a scaly shape, and weld bubbles are formed on the finished product W.

As shown in Fig. 11, a weld mark Sc is formed at the initial arc start point P1. Further, the same weld mark Sc is also formed at the arc restart point P2 which is deviated from the movement interval Mp only from the arc start point P1 along the welding progress direction Dr. The weld mark Sc is sequentially formed even below the arc restart point P3. Thus, as a result of the weld marks being formed in a scaly shape, the weld bubbles B are formed.

In the stitch pulse welding, welding is started at the arc start point based on the welding current and the welding voltage. Secondly, the welding is stopped after the welding time has elapsed, and only in the standby cooling time, the welding gas is cooled by the shielding gas. After cooling, the arc welder T is moved to an arc restart point that is only deviated from the arc start point by the movement interval. At the same time, welding and cooling are performed in the same manner as the arc start point, and this operation is repeated until the arc end point. In this way, the solder bubble B can be formed.

In the eleventh figure, a plurality of weld marks Sc are expressed in the same size. However, in actuality, in the vicinity of the arc starting point, specifically, in the region from the arc starting point up to several preceding arc restart points, the soldering is insufficient because the temperature of the base material and the bonding wire is not sufficiently increased. Thereby, the weld mark Sc near the arc start point becomes smaller than the weld mark Sc at other places.

As shown in the twelfth figure, in the region from the arc start point P1 to the arc restart point P3, since the temperatures of the base material and the weld line are not sufficiently raised, the size of the weld mark Sc becomes small. After the arc restart point P4, since the temperature of the base material and the weld line is stabilized and sufficiently welded, the size of the weld mark Sc becomes approximately the same. As a result, the width of the welding bubble Bs near the arc starting point becomes narrower than the width of the welding bubble Bt formed after the temperature of the welding line is stabilized.

In order to solve the above problem, the conventional technique is to increase the temperature of the base material by performing normal arc welding from the starting point of the arc to a position deviating only a few mm, and then the stitch pulse welding is started after the arc is stabilized. However, in this case, in the portion where the normal arc welding is performed, since the weld mark is not formed into a scale shape, a good appearance cannot be obtained.

An object of the present invention is to provide a stitch pulse welding method capable of improving the appearance by slowly changing the welding conditions for a predetermined period of time from the start point of the arc to fix the bubble width.

In order to solve the above problems, according to a first aspect of the present invention, a stitch pulse welding method is provided which is based on a welding condition including a welding current value, a welding voltage value, and a welding time, and is generated from an arc starting point in a state where the welding device is stopped. The arc, after stopping the arc after the welding time passes, repeatedly causes the welder to move to the arc restart point only from the arc starting point from the arc starting point by a predetermined moving interval to regenerate the arc at the arc starting point At the same time, the weld marks formed by the generation of the arc are superimposed into a scaly shape, thereby forming welding bubbles on the finished product. According to the stitch pulse welding method, the number of weld marks reaches a predetermined initial formation number, and is welded by predetermined initial welding conditions including the initial welding current value, the initial welding voltage value, and the initial welding time. Further, after the number of weld marks reaches the initial formation number, it is welded by predetermined constant welding conditions including a constant welding current value, a constant welding voltage value, and a constant welding time.

[First Embodiment]

Hereinafter, a first embodiment of the present invention will be described based on embodiments with reference to the drawings.

As shown in the first figure, the stitch pulse welding device 1 of the present embodiment is a configuration of the machine control device RC and the teaching suspension system TP, which is different from the conventional technique shown in FIG. In the first figure, the operator M, the welding power source WP, the bobbin 56, the gas compression cylinder 58, and the like shown in the ninth diagram are omitted. Hereinafter, the machine control device RC and the teaching suspension system TP which constitute the main part of the present invention will be described.

The machine control device RC controls the welding operation of the operator M. The machine control device RC includes a main control unit 3, an operation control unit 11, a drive command unit 12, a hard disk 4, a RAM 5 as a temporary calculation area, a CPU 6 as a central calculation processing device, and a welding condition output control of the main welding control. The portion 13 and the servo driver (not shown) are connected to each other via a bus bar (not shown). The motion control unit 11 performs the trajectory calculation of the operator M, and outputs the result of the calculation as a drive signal to the drive command unit 12. The drive command unit 12 outputs a servo control signal for controlling the rotation of each servo motor of the operator M. Hard disk 4 memory program and various parameters.

The teaching suspension system TP as an operation means includes a display unit 41 that displays various kinds of information, and a setting unit 42 that sets various materials such as position data and operation parameters of the operator M. The various materials input by the setting unit 42 are input to the main control unit 3 of the machine control device RC.

The main control unit 3 includes a teaching processing unit 20, a display processing unit 21, and an explanation executing unit 22. The initial number of formations of the stitch pulse welding conditions, the initial welding conditions, the constant welding conditions, the moving speed, the movement interval, and the cooling time are input from the setting unit 42 of the teaching suspension system TP to the teaching processing unit 20. At the same time, the teaching processing unit 20 memorizes the initial formation number Un, the initial welding condition Ic, the constant welding condition Tc, the moving speed Sp, the movement interval Mp, and the cooling time Cd in the hard disk 4. The display processing unit 21 displays the input various materials on the display unit 41 of the teaching suspension system TP as necessary. The explanation execution unit 22 outputs a command signal to the operation control unit 11 and the welding condition output control unit 13 based on the position data and the stitch pulse welding conditions stored in the hard disk 4, and the like.

The initial formation number Un is a parameter for setting the period during which initial welding is performed, which is specified by the number of weld marks. For example, when the setting 3 is the initial formation number Un, the period for forming the first three welding marks including the arc start point is set as the period during which the initial welding is performed.

The initial welding condition Ic is a welding condition for forming each weld mark during the initial welding, and specifically shows the initial welding current value Ci, the initial welding voltage value Vi, and the initial welding time Ti. Each condition value of the initial welding condition Ic is set to a condition value higher than the constant welding condition Tc. Each condition value of the initial welding condition Ic is set based on the experience or experiment of the operator. The reason why the condition value higher than the constant welding condition Tc is set is as follows. The size of the weld mark is determined by the combination of the welding current value, the welding voltage value, and the welding time. For example, the longer the welding time, the larger the size of the weld mark, the shorter the welding time, and the smaller the size of the weld mark becomes. As described in the prior art, since the temperature of the base material and the weld line near the arc starting point is not sufficiently increased, the size of the weld mark becomes small. Therefore, for the initial welding, the initial welding condition Ic including the condition value set to be higher than the constant welding condition Tc is selected. Specifically, the initial welding current value Ci, the initial welding voltage value Vi, and the initial welding time Ti are set to be higher than the respective condition values of the constant welding condition Tc.

Further, different initial welding conditions Ic may be set for each weld mark. Further, only the initial welding conditions at the arc start point may be set in advance, and the welding conditions for forming the respective weld marks may be automatically calculated after the arc start point. In the following description, the latter method is employed.

The constant welding condition Tc is a constant welding condition after the number of weld marks reaches the initial formation number Un. That is, the constant welding condition Tc shows the welding current value, the welding voltage value, and the welding time for performing the original stitch pulse welding. This is regarded as a constant welding current value Ct, a constant welding voltage value Vt, and a constant welding time Tt, and is described below. Further, the moving speed Sp, the moving interval Mp, and the cooling time Cd are the same as those described in the prior art.

The welding condition output control unit 13 outputs the welding control signal Wc to the welding power source Wp for a predetermined time. Specifically, the welding condition output control unit 13 outputs a welding control signal Wc including the initial welding current value Ci, the initial welding voltage value Vi, and the initial welding condition Ic of the initial welding time Ti to the welding power source at the arc starting point. Wp. The welding condition output control unit 13 counts the number of weld marks, and gradually decreases from the above-described respective condition values of the initial welding condition Ic to the respective condition values of the constant welding condition Tc (that is, constant) until the number reaches the initial formation number Un. The so-called downslope control is performed by the welding current value Ct, the constant welding voltage value Vt, and the constant welding time Tt). After the number of weld marks reaches the initial formation number Un, the welding condition output control unit 13 outputs the constant welding condition Tc to the welding power source Wp, and continues the constant stitch pulse welding.

Hereinafter, the downslope control regarding the welding condition output control unit 13 will be described with reference to the second diagram.

The second diagram is a flowchart showing the flow of processing of the welding condition output control unit 13. Hereinafter, a process of performing downhill control until the number of weld marks starts to reach the initial formation number Un from the arc start point, and then moving to a constant stitch pulse welding will be described. Since the processing after the transition to the constant stitch pulse welding is the same as that of the conventional one, the description thereof will be omitted.

In step S1, the welding condition output control unit 13 reads the preset initial formation number Un and the initial welding condition Ic from the hard disk 4 while setting the number of weld marks to 0 (zero).

In step S2, the welding condition output control unit 13 outputs the initial welding condition Ic to the welding power source Wp.

In step S3, the welding condition output control unit 13 confirms the input of the welding end signal from the welding power source Wp. When the welding is not completed, the welding condition output control unit 13 stands by as it is, and if the welding is completed, the process proceeds to step S4.

In step S4, the welding condition output control unit 13 sets the number of weld marks to +1.

In step S5, the welding condition output control unit 13 confirms whether or not the number of weld marks has reached the initial formation number Un. When the number of weld marks does not reach the initial formation number Un, the welding condition output control unit 13 proceeds to step S6. When the number of weld marks reaches the initial formation number Un, the welding condition output control unit 13 proceeds to step S7.

In step S6, the welding condition output control unit 13 calculates the secondary welding condition (that is, the secondary welding current value, the secondary welding voltage value, and the secondary welding time at the next arc starting point) as follows. When the welding conditions for forming the respective weld marks are set, the welding condition output control unit 13 reads out the condition from the hard disk 4.

The initial welding current value is Ci, the initial welding voltage value is Vi, the initial welding time is Ti, the constant welding current value is Ct, the constant welding voltage value is Vt, and the constant welding time is set. When Tt is used, the initial formation number is set to Un, and the number of weld marks up to the present is Uc, the secondary welding current value Cn, the secondary welding voltage value Vn, and the secondary welding time Tn can be easily calculated using the following formula. .

Secondary welding current value Cn=Ci-(Ci-Ct)/Un x Uc

Secondary welding voltage value Vn=Vi-(Vi-Vt)/Un x Uc

Secondary welding time Tn=Ti-(Ti-Tt)/Un x Uc

At the same time, the welding condition output control unit 13 returns to step S2 and outputs the secondary welding condition to the welding power source Wp. Thereafter, the welding condition output control unit 13 repeats steps S3 to S6 until the number of weld marks reaches the initial formation number Un.

After the number of weld marks reaches the initial formation number Un, the welding condition output control unit 13 reads out the set constant welding condition Tc from the hard disk 4 in step S7.

In step S8, the welding condition output control unit 13 moves from the welding transition of the downslope control to the constant stitch pulse welding. The welding condition output control unit 13 continues the stitch pulse welding until the arc end point by outputting the constant welding condition Tc to the welding power source Wp.

In this way, the welding condition output control unit 13 counts the number of weld marks, and gradually decreases the condition value of the initial welding condition Ic from the condition value of the initial welding condition Ic to the condition value of the constant welding condition Tc until the number reaches the set initial formation number Un. And carry out downhill control. After the number of weld marks reaches the initial formation number Un, the welding condition output control unit 13 outputs the constant welding condition Tc to the welding power source Wp, and continues the constant stitch pulse welding.

Next, referring to the third diagram, the downslope control in the case where the welding time is stepwise shortened will be described. As shown in the third figure, the initial welding time was set to 1.3 seconds, the constant welding time was set to 1.0 second, and the initial formation number was set to three. That is, at the time when the number of weld marks became four, the welding time was set to a constant welding time of 1.0 second.

According to the present invention, welding is performed under predetermined initial welding conditions while the number of weld marks has reached a predetermined initial number of formations, and welding is performed under constant welding conditions after the number of weld marks reaches the initial formation number. . Thereby, since the width of the welding bubble near the arc starting point is not narrowed, the appearance of the welding bubble can be improved.

In the present invention, although the downslope control is performed on all of the welding current, the welding voltage, and the welding time, in general, it is preferable to perform the downslope control for the welding time or the welding current. Therefore, in the first embodiment, the welding time or the welding current is stepwise reduced each time the number of weld marks is increased. Thereby, in addition to the above effects, the width of the welding bubble near the starting point of the arc can be fixed to further enhance the aesthetic appearance of the welding bubble.

Further, the initial welding time is automatically calculated based on the initial welding time, the initial formation number, and the constant welding time at the arc starting point, and based on the initial welding current value, the initial formation number, and the constant welding current value at the arc starting point. The initial welding current value is automatically calculated. Thereby, in addition to the above effects, the setting of the initial welding conditions can be simplified.

[Second embodiment]

Next, a second embodiment of the present invention will be described with reference to the fourth and fifth figures. In the second embodiment, the initial welding number and the initial welding condition are automatically calculated by inputting the constant welding current and the constant welding voltage to the welding condition database. Further, in the welding condition database, the correspondence relationship between the welding condition reference value and the initial formation number, and the welding time corresponding to the number of welding marks are memorized in advance. Hereinafter, the welding condition database 24 (which is different from the first embodiment shown in the first embodiment) in the hard disk 4 and the welding condition calculation unit 23 in the main control unit 3 will be described. Other configurations are the same as those of the first embodiment, and thus the description thereof will be omitted.

As shown in the fourth figure, the welding condition database 24 stores the thickness of the finished product used, the material and diameter of the welding line, and the construction result of the stitch pulse welding in the actual welding environment. When the welding condition calculation unit 23 receives the constant welding condition Tc (that is, the constant welding current value Ct, the constant welding voltage value Vt, and the constant welding time Tt), the welding condition database 24 can automatically calculate the initial formation number Un and the initial stage. Welding condition Ic. In addition, the initial welding condition Ic includes the initial welding current value Ci, the initial welding voltage value Vi, and the initial welding time Ti.

As shown in the fifth figure, in the welding condition database 24, the reference value of the welding voltage is set to the vertical axis, and the reference value of the welding current is set to the horizontal axis, and both the welding voltage and the welding current are accumulated therein. The number of weld marks necessary for initial welding under the conditions corresponding to the reference value, and the welding time for uniformizing the diameter of the weld mark formed by the initial welding. The data in the thick line frame of the fifth figure is the case where the welding current value is set to 90 to 100 A and the welding voltage value is set to 15 to 17 V for stitch pulse welding. In this case, the number of weld marks necessary for initial welding, that is, the initial formation number Un is seven. In the welding condition database 24, the welding time for uniformizing the diameter of each weld mark in the initial welding is determined in accordance with the number of weld marks. The welding time is not a direct value but is expressed as a ratio (%) with respect to a predetermined constant welding time Tt.

Next, the operation of the welding condition calculation unit 23 will be described. The welding condition calculation unit 23 calculates the initial formation number Un and the initial welding condition Ic from the welding condition database 24 based on the input constant welding condition Tc. Hereinafter, a case where "constant welding current value Ct = 120 A, constant welding voltage value Vt = 16 V, constant welding time Tt = 1.0 second" is input as the constant welding condition Tc will be described.

First, the welding condition calculation unit 23 calculates the initial formation number Un. The welding condition calculation unit 23 searches for the matching condition from the welding condition database 24 because the constant welding current value Ct=120A and the constant welding voltage value Vt=16V. As a result, since the condition shown by the broken line frame conforms to the input constant welding condition Tc, the initial formation number Un becomes five.

Next, the welding condition calculation unit 23 calculates the initial welding time Ti. The constant welding time Tt is 1.0 second. According to the conditions shown by the broken line frame, the initial welding time Ti of the weld mark is 140% for the first, 130% for the second, 120% for the third, and the fourth is 110%, the fifth is 100%. That is, regarding the initial welding time Ti of the weld mark, the first one is 1.0x140%=1.4 seconds, the second one is 1.0x130%=1.3 seconds, the third is 1.0x120%=1.2 seconds, and the fourth is 1.0. X110% = 1.1 seconds, the fifth is 1.0x100% = 1.0 seconds. Further, the initial welding current value Ci may be set to be the same as the constant welding current value Ct, and the initial welding voltage value Vi may be set to be the same as the constant welding voltage value Vt. The welding condition calculation unit 23 memorizes the calculated initial formation number Un and the initial welding condition Ic in the hard disk 4 .

In the same manner as the first embodiment, the welding condition output control unit 13 outputs the welding control signal Wc to the welding power source Wp based on the calculated initial formation number Un and the initial welding condition Ic. The welding condition output control unit 13 counts the number of weld marks, and gradually decreases the condition value of the initial welding condition Ic to the condition value of the constant welding condition Tc from the condition value of the initial welding condition Ic until the number of the initial formation numbers Un is reached. And carry out downhill control. In the present embodiment, the welding condition output control unit 13 only reduces the welding time step by step and outputs it to the welding power source Wp. After the number of weld marks reaches the initial formation number Un, the welding condition output control unit 13 outputs the constant welding condition Tc to the welding power source Wp, and continues the constant stitch pulse welding.

In the second embodiment, the initial relationship between the welding condition reference value and the initial formation number is output to the pre-memorized welding condition database, and the initial formation number and the initial welding condition are automatically calculated. That is, as long as the constant welding current value and the constant welding voltage value are set, since the initial number of formations and the initial welding conditions are automatically calculated, the setting man-hour of the welding conditions can be reduced.

[Third embodiment]

Next, a third embodiment of the present invention will be described with reference to Figs. 6 to 8 . In the third embodiment, the initial formation number, the initial welding condition, and the constant welding condition are automatically calculated by outputting the diameter of the weld mark corresponding to the bubble width to the welding condition database. Further, in the welding condition database, the relationship between the diameter of the weld mark and the constant welding current value and the constant welding voltage value is memorized in advance. Hereinafter, the diameter Sr of the weld mark stored in the hard disk 4 and the welding condition database 24 (which is different from the first embodiment shown in the first embodiment) and the welding in the main control portion 3 will be described. Condition calculation unit 23. Other configurations are the same as those of the first embodiment, and thus the description thereof will be omitted.

The diameter Sr of the weld mark corresponds to the diameter (i.e., the bubble width) of the weld mark formed when the stitch is pulse-welded. The diameter Sr of the weld mark is input by the setting portion 42 of the teaching suspension system TP. In the welding condition database 24, the relationship between the predetermined welding conditions and the diameter of the weld marks under the conditions thereof corresponds to and is related to the number of weld marks. When the diameter Sr of the weld mark is input, the welding condition calculation unit 23 automatically calculates the initial formation number Un, the initial welding condition Ic, and the constant welding condition Tc from the welding condition database 24.

As shown in (a) and (b) of the seventh figure, the data accumulated in the welding condition database 24 is set to the thickness of the finished product to be used, the material and diameter of the welding line, and the actual welding environment. The reference values of the welding current and the welding voltage are set, and the guest should set the reference value for the stitch pulse welding, and the diameter of the weld mark is measured for the number of each weld mark. Hereinafter, each material of the welding condition database 24 will be specifically described.

(a) of the seventh figure is a result of measuring the diameter of the weld mark for the diameter of each weld mark when the welding time is fixed to 0.7 seconds so that the welding current value and the welding voltage value are changed to perform the stitch pulse welding. A database of benchmarks. For example, the data recorded in the thick wire frame of (a) of the seventh figure shows the diameter of the weld mark under the welding condition that the welding time is 0.7 seconds, the welding current value is 90 A, and the welding voltage value is 15 V. One is 1.9mm, the second is 2.1mm, and the last seventh is 3.5mm. In the eighth and subsequent materials, since the diameter of the weld mark becomes stable after the eighth, it becomes 3.5 mm, so it is omitted.

Furthermore, the welding time is increased every 0.1 seconds (0.8 seconds, 0.9 seconds, ...), and the welding current and the welding voltage are changed, and the diameter of the welding mark is measured for the number of each welding mark. The results can also be databaseized. (b) of the seventh figure shows a database such as when the welding time is 1.3 seconds. In (a) and (b) of the seventh embodiment, for the sake of convenience of explanation, the value when the welding voltage value is other than 15 V is omitted. In addition, the diagonal lines show no information needed to stabilize the diameter of the weld marks. Further, Ad1 to Ad10 in (a) and (b) of the seventh figure show the data under the processing stability stage of the weld mark in each welding condition. Hereinafter, these materials are referred to as stable time data Ad.

Next, the operation of the welding condition calculation unit 23 will be described. The welding condition calculation unit 23 calculates the initial formation number Un, the initial welding condition Ic, and the constant welding condition Tc from the welding condition database 24 based on the diameter Sr of the welded spot to be input. Hereinafter, a case where the diameter Sr of the input weld mark is 3.5 mm will be described as an example.

First, the welding condition calculation unit 23 calculates the constant welding condition Tc and the initial formation number Un. The constant welding condition Tc is a welding condition when the diameter of the weld mark is stable. The initial formation number Un is the number of weld marks required for the diameter of the weld mark to be stable.

In order to calculate the constant welding condition Tc and the initial formation number Un, the welding condition calculation unit 23 extracts data matching the diameter Sr of the welded spot to be input from the stabilization time data Ad in each welding condition. If the diameter Sr of the welded spot to be input does not match, the welding condition calculation unit 23 extracts the material closest to the diameter Sr of the welded spot to be input. In the case of the welding condition database 24 shown in FIG. 7(a), the welding condition calculation unit 23 selects the stabilization time data Ad1 and the stabilization time data Ad2 whose welding mark diameter is 3.5 mm. The stabilization time data Ad1 is a welding current value of 90 A, a welding voltage value of 15 V, and a welding time of 0.7 seconds, and this condition becomes a candidate for the constant welding condition Tc. Further, according to the above conditions, the number of weld marks is seven, which is a candidate for the initial formation number Un. Similarly, the stabilization time data Ad2 is a welding current value of 100 A, a welding voltage value of 15 V, and a welding time of 0.7 seconds, and this condition becomes a candidate for the constant welding condition Tc. Further, according to the above conditions, the number of weld marks is five, which is a candidate for the initial formation number Un.

When there are a plurality of candidates for the condition, the calculated constant welding condition Tc and the number of initial formation numbers are displayed on the display unit 41 of the teaching suspension system TP. At the same time, the operator is allowed to select the constant welding condition Tc and the initial formation number. If there is more than one candidate for the constant welding condition Tc and the initial number of formations, it is not necessary for the operator to select this. In this way, the welding condition calculation unit 23 can calculate the constant welding condition Tc and the initial formation number Un, and if necessary, let the operator select it and store it in the hard disk 4.

Next, the welding condition calculation unit 23 calculates the initial welding condition Ic. By the processing up to the above, the constant welding condition Tc and the initial formation number Un can be calculated. Next, when the diameter Sr of the welded spot to be input is 3.5 mm, the welding current value 90A, the welding voltage value of 15 V, and the welding time of 0.7 seconds which are the constant welding conditions Tc and correspond to the stabilization time data Ad1 are calculated. The method of calculating the initial welding condition Ic in the case where the number of initial formations Un is seven is calculated.

The welding condition calculation unit 23 extracts data that matches the diameter Sr of the weld mark to 3.5 mm from among the data when the number of weld marks in each welding condition is one. If the diameter Sr of the weld mark is not equal to 3.5 mm, the welding condition calculation unit 23 extracts the data closest to the diameter Sr of the welded spot to be input. In the case of the welding condition database 24 shown in FIG. 7(a), the welding condition calculation unit 23 selects the data Bd1 having a welding mark diameter of 3.5 mm. Based on the selected data Bd1 and the stabilization time data Ad1, the welding condition calculation unit 23 automatically calculates the initial welding condition Ic.

As shown in (a) of the eighth diagram, the welding conditions of the first weld mark are set to the same conditions as the data Bd1. The welding conditions of the seventh and eighth welding marks are set to the same conditions as the stabilization time data Ad1. Meanwhile, as shown in the bottom line portion of (a) of the eighth figure, the welding conditions of the second to the six welding marks equally divide the welding current value between the data Bd1 and the stable time data Ad1, which is set such that the number of welding marks The more the welding current, the lower the value.

Further, in the above-described example, the data Bd1 is selected and the welding current values of both are equally divided based on the data Bd1 and the stabilization time data Ad1 to automatically calculate the initial welding condition Ic, but the alternative is The diameter of the weld mark was selected to be the data Bd2 near 3.5 mm. In this case, as shown in (b) of the eighth diagram, the welding conditions of the first weld mark are set to the same conditions as the data Bd2. The welding conditions of the seventh and eighth welding marks are set to the same conditions as the stabilization time data Ad1. Meanwhile, as shown in the bottom line portion of the eighth figure (b), the welding conditions of the second to the six weld marks equally divide the welding time between the data Bd2 and the stable time data Ad1, which is set such that the number of weld marks per time When added, the welding time can be shortened step by step.

At the same time, the welding condition calculation unit 23 memorizes the calculated initial formation number Un, the initial welding condition Ic, and the constant welding condition Tc on the hard disk 4 . Since the subsequent processes are the same as those of the first embodiment, the description thereof will be omitted.

As described above, in the third embodiment, by the predetermined value of the diameter of the weld mark corresponding to the bubble width, the diameter of the weld mark is input to the relationship between the diameter of the weld mark and the constant welding current and the constant welding voltage. The initial number of formations, initial welding conditions, and constant welding conditions can be automatically calculated from the predetermined welding condition database. Therefore, in addition to the width of the welding bubble which can be fixed near the arc starting point, the setting man-hour of the welding condition can be reduced.

1‧‧‧needle pulse welding device

3‧‧‧Main Control Department

4‧‧‧ Hard disk

5‧‧‧RAM

6‧‧‧CPU

11‧‧‧Action Control Department

12‧‧‧Drive Command Department

13‧‧‧Welding condition output control unit

20‧‧‧Teaching and Processing Department

21‧‧‧Display Processing Department

22‧‧‧Interpretation and implementation

23‧‧‧Welding condition calculation department

24‧‧‧ welding condition database

41‧‧‧Display Department

42‧‧‧Setting Department

Ad1, Ad2. . . Stable time data

Bd1, Bd2. . . Selected data

Cd. . . Cooling time

Ci. . . Initial welding current value

Cn. . . Secondary welding current value

Ct. . . Constant welding current value

Ic. . . Initial welding condition

M. . . Operator

RC. . . Machine control unit

Sp. . . Moving speed

Sr. . . Weld mark diameter

T. . . Arc welder

Tc. . . Constant welding condition

Ti. . . Initial welding time

Tn. . . Secondary welding time

TP. . . Teaching suspension system

Tt. . . Constant welding time

W. . . Finished product

Wc. . . Welding control signal

Un. . . Initial formation

Vi. . . Initial welding voltage value

Vn. . . Secondary welding voltage value

Vt. . . Constant welding voltage value

WP. . . Welding power supply

The first drawing is a block diagram of a stitch pulse welding device to which the stitch pulse welding method of the first embodiment of the present invention is applied;

The second figure shows a flow chart of the downslope control of the welding condition output control section;

The third figure is a diagram for explaining the downslope control that only shortens the welding time in stages;

Figure 4 is a block diagram of a stitch pulse welding device to which the stitch pulse welding method of the second embodiment of the present invention is applied;

The fifth figure shows a table of the welding condition database;

6 is a block diagram of a stitch pulse welding device to which the stitch pulse welding method of the third embodiment of the present invention is applied; (a) and (b) of the seventh figure are tables showing a welding condition database; (a) and (b) are tables for explaining the order in which the initial welding conditions are automatically calculated; the figure 9 is a block diagram of a stitch pulse welding device to which the conventional stitch pulse welding method is applied; (a) to (10) d) is used to illustrate the pattern diagram of the pulse welding of the stitch; the eleventh figure is used to illustrate the pattern diagram of the welding bubble formed by the welding construction; and the twelfth figure is used to illustrate the welding mark near the starting point of the arc The pattern of the look.

Claims (6)

A stitch pulse welding method is based on a welding condition including a welding current value, a welding voltage value, and a welding time, and an arc is generated in a state in which the welder is stopped, and after the aforementioned arcing time is stopped, the arc is repeatedly made The welding device moves in the direction of the welding, moves from the arc starting point only to the arc restart point by a predetermined moving interval, to generate an arc at the arc starting point, and at the same time, the welding formed by the use of the primary arc is generated. The mark is superimposed into a scaly shape to form a solder bubble on the finished product, and the stitch pulse welding method is characterized in that the number of the weld marks reaches a predetermined initial formation number, and the number of the weld marks increases. The welding time is shortened at least in stages, wherein the welding time is automatically calculated based on the initial welding time at the arc starting point, the initial formation number, and the constant welding time. A stitch pulse welding method is based on a welding condition including a welding current value, a welding voltage value, and a welding time, and an arc is generated in a state in which the welder is stopped, and after the aforementioned arcing time is stopped, the arc is repeatedly made The welding device moves in the direction of the welding, moves from the arc starting point only to the arc restart point by a predetermined moving interval, to generate an arc at the arc starting point, and at the same time, the welding formed by the use of the primary arc is generated. The mark is superimposed into a scaly shape to form a solder bubble on the finished product, and the stitch pulse welding method is characterized in that the number of the weld marks reaches a predetermined initial formation number, and the number of the weld marks increases. Temporarily shortening at least the welding current value, wherein the welding current value is based on an initial welding current value at the arc starting point, and the initial formation The number and the constant welding current value are automatically calculated. The stitch pulse welding method according to claim 1 or 2, wherein the initial formation number is obtained by inputting the constant welding current value and the constant welding voltage value to a pre-memorized welding condition reference value and an initial formation number. The correspondence condition of the welding condition database is automatically calculated. The stitch pulse welding method according to claim 1 or 2, wherein the initial welding condition is obtained by inputting the constant welding current value and the constant welding voltage value to a pre-memorized welding condition reference value and the welding The number of traces corresponds to the welding condition database corresponding to the initial welding conditions, and is automatically calculated. The stitch pulse welding method according to claim 1 or 2, wherein the initial formation number is input by pre-memorizing the diameter of the weld mark generated by the constant welding current value and the constant welding voltage value. Calculating the constant welding current value and the constant welding voltage value by using a welding condition database having a relationship between the diameter of the trace and the constant welding current value and the constant welding voltage value, and calculating the calculated constant welding current value and the aforementioned constant welding The voltage value is input to a welding condition database in which the constant welding current value and the relationship between the constant welding voltage value and the initial formation number are stored in advance, and is calculated. The stitch pulse welding method according to claim 1 or 2, wherein the initial welding time or the initial welding current value at the arc starting point is generated by the constant welding current value and the constant welding voltage value. The diameter of the weld mark is input to a welding condition database in which the relationship between the diameter of the weld mark and the constant welding current value and the constant welding voltage value is stored in advance.