JPH0484685A - Method for welding superposed steel plate - Google Patents

Abstract

PURPOSE:To allow short pitch and multiple spotting by pinching plural sheets between a pair of rotating electrodes and subjecting the steel plates to roll spot welding apart spacings and subjecting the part between the roll spot welded weld zones of the steel plates to laser spot welding to each other by the laser beam cast from a laser torch moving integrally with the rotating electrodes. CONSTITUTION:A robot 34 is started by a robot control panel 32 when a body 1 flowing in a production line is positioned. A gun head part 45 and a laser torch 64 are then moved toward the body 1 and are positioned to a welding section. The rotating electrodes 47 are then pressurized by pressurizing cylinders to pinch and press the section to be welded of the body 1 by the rotating electrodes 47. The robot 34 starts moving in this state and moves a gun head part 45 and the laser torch 64 to a direction to be welded. A timer 42 and contact 43 of a spot welding device 41 are operated and a laser oscillator 62 of a spot welding device 61 is operated. The body 1 is thus joined by the alternate welding consisting of the roll spot welding and the laser spot welding.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for joining stacked steel plates by a combination of roll-slot welding and laser spot welding.

[Prior Art] A technique for spot welding using a disc-shaped rotating electrode is disclosed, for example, in Japanese Utility Model Application Publication No. 36384/1984. In addition, the technology of attaching it to a robot (puta clamp) to pressurize the material to be welded and laser welding the pressurized part is
It is shown in Publication No. 18079/4.

FIG. 11 shows a small welding part of an automobile.

In the figure, 1 indicates the body, and 2 indicates a part of the front pillar. As shown in FIG. 12, the front pillar part 2 is composed of a plurality of overlapping steel plates. These multiple steel plates are Reinforce 3,)
[] Consists of a front pillar outer 1 and a front pillar inner 5. FIG. 12 shows a flange portion 2a that is a joint portion of the front pillar portion 2. As shown in FIG. This flange part 2a
Here, the flanges 3a, 4a, and 5a of each of the above members are overlapped. Rainforce 3 is no [con] ~
The flanges 3a, 4a, and 5a of each member located between the pillar outer 4 and the front pillar inner 4 are joined by welding W through the spora 1. Incidentally, a seek (sealing agent) 6 is interposed between the flanges 3a and 4a, and a seek (sealing agent) 6 is also interposed between the flanges 3a and 5a. .

Welding of the fan 1 to the pillar part 2 as shown in Fig. 11 is performed by the spot welding equipment shown in Fig. 13.3 This welding equipment performs series welding using a pair of stud guns. The stud gun 11 functions as a pressurizing means. An electrode 12 is provided at the tip of each stud can 11, and each electrode 12 is connected to a welding transformer 14 via a gouple 13. Below the stud gun 11 is an electrode thread 15.
are arranged, and the electrode stall 11j is provided with a replaceable electrode 16. The body 1 of the automobile is arranged between an upper electrode 12 and a lower electrode 16, and when the stud gun 11 is operated and the upper electrode 12 is pressurized and energized, the sun top pillar part 2 of the body 1 is moved in series. It is designed to be welded.

Incidentally, the welding of the pillar part 2 to the pillar part 2 is also carried out by a device other than the bearing device shown in FIG. For example, in a system in which a portable spot gun (not shown) is held by a robot I~, the robot 1~ positions the portable spot gun at each predetermined position, and the superimposed steel plates are placed in a spot at a predetermined interval. 1 to be welded.

[Problem to be Solved by the Invention 1] In recent years, there has been a demand for increasing the bore's rigidity from the perspective of improving the vibration damping properties of automobiles when they are running. Shorter pitches and multiple dots are now required when welding.

However, various problems arise in realizing the short pitch of -C and the increase in the number of dots by conventional spora 1 welding.

(b) Using the welding equipment shown in Figure 13 to make similar pips,
Attempting to achieve multi-dot welding inevitably requires narrowing the spacing between stud guns, but this has physical limits and makes it impossible to obtain the desired welding pitch.

I The method of holding the portable system gun on the robot 1 and having the robot move the portable spot gun little by little is not impossible to weld at short pitches, but the time required for welding is significantly longer. 1. The production capacity cannot follow the flow of the production line. In this case, it may be possible to add more robots, but in a welding area with limited space, it is impossible to weld two joints 11N, and the time required for welding is also long. Become. In addition, the above-mentioned Japanese Patent Application Laid-Open No. 1-180794,
I'm having a similar problem to this right.

The present invention has been made in view of the above problems, and provides a method for welding steel plates that allows short pitches and multiple welding points without requiring a long time for welding when superimposed steel plates are welded. The purpose is to provide

[Means for Solving the Problem 1] A method for welding stacked steel plates according to the present invention in accordance with this object is a welding method for stacking and joining a plurality of steel plates, in which the plurality of steel plates are joined by a pair of rotating The roll spot welds are welded at intervals between the electrodes, and the laser beam irradiated from the lasers 1 to 1, which move together with the rotating electrodes, is used to spot the welded parts of the steel plate at intervals. 3□ Consisting of a method of welding between laser spora (to
[Function] In the method of welding stacked steel plates constructed in this way, a plurality of steel plates are sandwiched between a pair of rotating electrodes,
Roll spot welding is performed on this rotating electrode at predetermined intervals. At the same time, the welded portions of the steel plates that have been roll spot welded are spot welded by laser light irradiated from the laser beams. As a result, the steel plate is rolled spot welded and laser spora 1~
Welding is performed alternately with welding, allowing for short pitches and multiple dots. In addition, rotating electrodes and lasers
Since it moves together with the machine, there is no interference during work, and there is no need to wait for work. Therefore, compared to the method of moving a portable spot gun using a J-bot, there is no need to spend a long time on welding, and short pitches and multiple welding points can be achieved in a short time. 1 [Example] Hereinafter, a preferred embodiment of the method for welding stacked steel plates according to the present invention will be described with reference to the drawings.

1 to 10 show an embodiment of the present invention, and FIGS. 1 to 4 show an embodiment of the present invention.
This shows the welding equipment used for the welding process.

FIG. 2 shows an outline of a welding device for small-day welding of automobiles.The body welding device 21 can be roughly divided into 1'' bot device 31, ROSIS bot 1 to welding device 41,
It is composed of a laser spora 1 to a welding device 61. ~ The device 31 is a robot control panel 32, an intano I
It is composed of an X-board 33, [1 item] to 34.1 to a racking mechanism section 35. The robot control panel 32 includes
Robots I to 34 are connected, and the robot 34 executes the contents taught based on the programs input to the robots 1 to control panel 32. The interface board 33 has a function of inputting and outputting signals from the robot control panel 32 to and from external equipment, and also has a function of inputting signals from the external equipment to the robot control board 32. The racking mechanism section 35 has a function of moving the robot 34 in the front-rear direction of the body 1, under the control of signals from the control panel 32.

Subo 1 - old welding equipment, timer 42,] contactor 43
, a gun head section 45. The timer 42 is used to set the welding time. "Tactor 4
3 denotes a three-phase welding power source 40 for welding 1 to lance 50, which will be described later.
The contactor 43 is controlled to turn off by the timer 42 every time. The gun head portion 45 is attached to the above-mentioned small pieces 1 to 34. The gun head 45 includes a frame 46,
- It has a pair of rotating electrodes 47 and a pressurizing cylinder 48. The frame 46 is attached to the robots 1 to 34 via a base 49. Rotating electrodes 47 are rotatably mounted on the frame 46. Each rotating electrode 47 is
Although it has the same function as a rotating electrode used for seam welding, the rotating electrode 47 of this embodiment is not rotationally driven by a rotational drive mechanism. The rotating electrode 47 is connected to a pressurizing cylinder 48, and the flanges of the front 1 to the pillar part 2 of the automobile body 1 are sandwiched between the pair of rotating electrodes 47 by the pressurizing operation of the pressurizing cylinder 48. Natsu (there is)

In this embodiment, the rotating electrode 47 is rotated by 3 degrees when moving the robots 1 to 34 with the front bin part 2 sandwiched between the rotating electrode 47. The rotating electrode 47 is bendable. It is connected to a bus bar (conductor) 53 via a movable copper plate 52. Bus bar; j3 is welding 1~
It is connected to the lance 50. Welding 1 to lance 50 are
It is cooled by cooling water supplied from the cooling water manifold 51.

The laser spora 1 to the welding device 61 include a laser oscillator 62,
It is composed of an optical fiber 63, a radar torch 64, and a driving section 70. The laser oscillator 62 is used to generate a laser beam, and the laser beam from the laser oscillator 62 is transmitted through an optical fiber 63 to a laser i to 64.
It is now sent to The laser torch 64 has a guard electrode 65, and a connector 66 for the optical fiber 63 is connected to the guard electrode 65.

A nozzle tip 66 is attached to the tip of the guard electrode 65. The nozzle chip 66 is held by a vibration-proof insulator 67 provided inside the card electrode 65. The nozzle depth 66 is tapered, and an output portion 66a for irradiating the Rayleigh beam to the outside is formed at its tip.

The laser torch 64 is connected to the drive unit 70 and a3,
The drive section 70 is held by the base 49 via a slide section 71. The Reikawa Ciro 4 moves forward and backward with respect to the small day 1 by the operation of the drive section 7 (). This is to make the focus of the laser beam coincide with the body 1 of the object to be welded C''.

Next, a method for welding stacked steel plates according to the present invention will be explained.

While body 1 is flowing on the production line, robot 1~
34 is in a retracted state and remains at the original position. When the body 1 flowing through the production line is stopped and positioned, the robots 1 to 34 are activated by signals from the control panel 32. As a result, it is attached to the robot 1 at 34 (the pulled can head section 45 and the laser 1 to 64
is small, moving towards i'-1 and trying to weld -
It is positioned at the location. A state in which the can head portion 45 is positioned ('' indicates the body 1]) The part to be welded is located between the pair of rotating electrodes 47, but is not yet pressurized by the rotating electrodes 474.

Gun head section 45 and laser gun attached to robot 34
When the positioning of the joint 64 is completed, the rotating electrode 47 is pressurized by the pressure cylinder 48, and the part of the body 1 to be welded is sandwiched and pressed by the rotating electrode 47. In this state, the robot 34 starts moving and moves the gun head 45 and laser torch 4 in the welding direction. Here, the timer 42 and contactor 43 of the spot welding device 41
At the same time, the laser oscillator 62 of the laser spot welding device 61 is activated, and the body 1 is joined by alternate welding by roll spot welding and laser spora 1 to welding. In this case, welding to the roll slot 1 precedes laser spot welding. That is, by performing laser spot welding between welded parts that have already been roll spot welded, short pitches and multiple welding points can be achieved.

Figure 6 shows part 2 of the front leaflet of the body 1 shown in Figure 5.
shows the welding condition. A roll spot weld 71 and a laser spora 1 - weld 72 are formed on the flange portions 2 a of the flon 1 - pillar part 2 by welding the roll spora 1 and welding to the laser spora 1 . Roll Spot Welds 71 and Laser Spora] The welds 72 are alternately formed along the flange portion 2a.

FIG. 7 shows a welding cross section in the case where normal spot welding is performed in the previous step and welding according to the present invention is applied in the next step. In the pre-process, the slots 1 to welded portions 70 are formed using a spot welding gun (not shown). In this embodiment, roll spot welding W and laser spot welding W2 among the plurality of welds shown in the figure are performed simultaneously, but the laser spot welding is generally set at a position close to the roll spot welding. It is also possible.

FIG. 10 shows the welding pitch when roll spot welding and laser spot welding are used together. In FIG. 10, P indicates the welding pitch of roll sporato welding, and P2 indicates the welding pitch of laser sporato welding. P3 shows the welding pitch when Roll Spora 1 ~ welding and laser spot welding are used (jf). As shown in the figure, by using Roll Spora 1 ~ welding and laser spot welding together, the conventional Spora 1 ~
Compared to spot welding using a welding gun, the welding pitch can be shortened, and there is no need to spend a long time on multiple points. Furthermore, by employing spot welding, the spot distortion at the welding area can be made smaller than in the case of multi-dot welding using conventional resistance spot welding.

When welding of a predetermined welding point is completed, the rotating electrode 4
The pressurization at 7 is released. When the pressure on the rotating electrode 47 is released, the gun head 45 and the lasers 1 to 64 are moved by the robot 34 and returned to their original positions.

In this embodiment, the present invention is applied to welding the body of an automobile, but the present invention can of course be applied to other products as long as superimposed steel plates are welded together.

[Effects of the Invention] As described above, the welding method for superimposed steel plates according to the present invention is performed by roll spot welding a plurality of steel plates by sandwiching them between a pair of rotating electrodes at intervals, and by performing roll spot welding using a pair of rotating electrodes. The laser spot welding is performed between the roll spora 1 and the welded portion of the steel plate using the laser light irradiated from the lasers 1 to 1, which move together with the roll spora 1 to the welded portion of the steel plate, so that the following effects can be obtained.

(a) By using roll spot welding and laser spora 1 to welding together, it is possible to shorten the pitch of welding, and it is possible to increase the rigidity of the welded structure. For example, when applied to welding the body of an automobile, it is possible to increase the rigidity of the body, improve the anti-photography characteristics when the automobile is running, and further improve the soundproofing characteristics against vibrations, squeaking, etc.

■ Roll spot welding, in which the steel plate is sandwiched and welded between a pair of rotating electrodes, enables faster dot speed compared to conventional resistance spora 1-welding, and welding time can be reduced even in multi-dot work. It will no longer become noticeably longer. Therefore, the production capacity can be made to follow the flow of the production line, and the process to which the method of the present invention is applied does not become a bottleneck in production.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an example of welding work to which the present invention is applied, Fig. 2 is a schematic configuration diagram of a small day welding device used in the welding work of Fig. 1, and Fig. 3 is a J3G [-1-Rusbo 1 ~ Welding equipment and laser welding equipment] ~ A front view of the main parts of the welding equipment, Figure 4 is a side view of Figure 3, and Figure 55 is a schematic side view of the body of an automobile to which the present invention is applied. Fig. 6 is an enlarged side view showing the welded state of a part of the front pillar in Fig. 5, Fig. 7 is an enlarged sectional view of a part of the welded part of the front pillar 1 to the pillar shown in Fig. 6, Fig. 8 is an enlarged sectional view taken along the line ■-■ in Fig. 6, Fig. 9 is an enlarged front view taken along the line IX-IX in Fig. 6, and Fig. 10 is a part of the front 1 to pillar in Fig. 6. Fig. 11 is an enlarged side view showing the welding state of a part of the conventional Norontobira; Fig. 12 is an enlarged i-side view along the xn-xn line of Fig. 11; FIG. 13 is a front view showing an example of a conventional slot 1 to welding device. 1...Bore 21...Small day welding device 31...Robot 1 to device 34...Robot 1 to 41...Roll Spot welding device 47...
・・Rotating electrode 61 ・・・Laser slot 1 ~ welding device 63 ・・・・・
...Optical fufunoiper 64...Laser 1 to -bu 71...Rolls box 1 to welding part 72...
・・Laser bot 1 ~ welding part ≧

Claims (1)

[Claims] 1. In a welding method in which a plurality of steel plates are overlapped and joined, the plurality of steel plates are sandwiched between a pair of rotating electrodes and roll spot welded at intervals, and irradiated by a laser torch that moves together with the rotating electrodes. 1. A method for welding stacked steel plates, comprising performing laser spot welding between the welded portions of the steel plates that have been roll spot welded using a laser beam.