JPH0732175A - Manufacture of laser beam welded member - Google Patents

Abstract

PURPOSE:To prevent a large recessed part and a through hole from being generated by irradiating a flange part in the vicinity of the bend of a mating work with a high density energy beam from the frange part of a work and welding both flange parts. CONSTITUTION:A laser beam torch 9 is arranged on the position in opposition to the seat surface 13b of the flange part 13a. The flange part 13a in the vicinity of the bend 14b of the flange part 14a is irradiated with the laser beam from the laser beam torch 9. Since the upper surface of the flange part 13a is flat, the melting quantity of metal is little as compared with the case when it is bent and spraying of assisting gas is carried out uniformly for the face of weld. Consequently, the inflow of molten metal into a gap between the flange parts 13a and 14a is reduced and the large recessed part and the through hole are not generated on a based 18 generated by welding.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a beam welding member for welding by irradiating a high density energy beam such as a laser or an electron beam.

[0002]

2. Description of the Related Art Conventionally, spot welding, which is electric welding, has been mainly performed in assembling an automobile body. In this spot welding, for example, as shown in FIG.
When welding the work 51 and the work 52, it is necessary to form flanges 51a and 52a having a wide width for sandwiching them by the electrodes 53 and 54 of the welding machine. Therefore, for example, as shown in FIG. 7, the rear pillar 55 to which the rear window glass 58 is attached is attached.
In the case of forming, the widths of the flange portions 56a and 57a of the rear pillar outer 56 and the rear pillar inner 57 are increased, and the weight is increased when a closed cross section of a predetermined size is obtained, that is, when a predetermined rigidity is secured. It's an invitation. Further, at the time of welding work, both electrodes 53.5
It is necessary to secure the movement space of No. 4, and it is easy to limit the shape of the work, the welding position, and the like.

Therefore, as described in Japanese Patent Laid-Open No. 60-49883, irradiation of a high-density energy beam such as a laser or an electron beam is applied to the works 51 and 52 which are superposed as described above. Beam welding has been proposed. That is, in this beam welding, the flange portions 51a and 52a of the works 51 and 52 may be set to have a width that allows welding by beam irradiation.
Therefore, in the rear pillar 59 shown in FIG. 8, the width of the flange portion 60a on one side of the rear pillar outer 60, which is the mounting side of the rear window glass 58, does not change so much due to the seating surface of the rear window glass 58. The width of the flange portion 61a on the one side of the rear pillar inner 61 and the flange portion 6 on the other side of the rear pillar outer 60 and the rear pillar inner 61.
The width can be made narrower than 0b and 61b. As a result, the weight can be reduced. Further, in beam welding, since the beam is irradiated from a position distant from the work, it is difficult to be restricted by the shape of the work, the welding position, etc., and the above problems can be solved.

[0004]

In the above-mentioned beam welding, the heat generated by the beam irradiation is sequentially transferred from the region on the beam irradiation side to the region on the opposite side, and each member is melted. The width of the melting of the members gradually decreases in the direction. Further, in beam welding, when the gap amount between members becomes large, for example, when the gap amount between both members becomes about 40% of the plate thickness of the beam irradiation side member in a state where two members are overlapped, the weld metal Is known to melt through the gap and open a hole in the weld. On the other hand, in order to secure the welding strength in the above-mentioned rear pillar 59, it is necessary to weld in the vicinity of the portion of the flange portions 60a and 61a where the bending for forming the closed cross section begins. Therefore, as shown in FIG. 9, when the beam irradiation is performed on the above-mentioned portions of the flange portions 60a and 61a on one side from the side of the narrow flange portion 61a, that is, the side where the above-mentioned bending starts first, welding is performed. The portion is a portion including the curved portion, and a larger amount of metal is melted than when the flat surface is irradiated with the beam. Then, when the assist gas is blown from the same direction as the beam irradiation or from the side during the beam irradiation, the flange portion 61a generated by the curved portion due to the pressure of the assist gas and the convection of the molten metal.
A large amount of molten metal enters the gap between 60a. As a result, a large recess is formed in the bead 62 generated by welding, or a through hole is generated, resulting in a decrease in welding strength and a deterioration in appearance. Further, when the welding position is shifted to the end side of the flange portions 61a and 60a in order to prevent this situation, there is a problem that the welding strength is lowered regardless of the quality of the welding state.

Therefore, it is an object of the present invention to provide a method for manufacturing a beam-welded member capable of preventing a decrease in welding strength and a deterioration in appearance due to beam welding.

[0006]

In order to solve the above problems, a method for manufacturing a beam welding member according to the invention of claim 1 is
The flange portion of the one side workpiece extended to the inside of the workpiece from the flange portion of the other side workpiece, and the flange portion of the other side workpiece having a shape that rises from the flange portion via the curved portion, one side It is characterized in that a high-density energy beam is irradiated from a position facing the flange portion of the work to a flange portion in the vicinity of the curved portion of the other work, and the both flange portions are welded.

A beam welding member manufacturing method according to a second aspect of the present invention is the beam welding member manufacturing method according to the first aspect of the present invention, in which after the welding of the both flange portions, the outer surface of the flange portion of the one side workpiece is welded. In addition, a sealing member, for example, another member is bonded via an adhesive.

A beam welding member manufacturing method according to a third aspect of the present invention is the beam welding member manufacturing method according to the first aspect, wherein the one side work and the other side work are pillar forming members for a vehicle. The other member is a window glass.

[0009]

According to the structure of claim 1, when the beam irradiation is performed from the position facing the flange portion of the work on one side toward the flange portion near the curved portion of the work on the other side, the beam irradiation surface becomes one side. Since the flange part of the side work is a flat surface, compared with the case where the beam irradiation is performed from the position facing the flange part of the other side work as described above,
The melting amount of metal decreases. That is, when the beam irradiation is performed from the position facing the flange portion of the other side work as described above, since the melting width of the metal on the beam irradiation side is wide,
The metal in the curved portion is also melted, and the amount of metal melted increases. Further, as described above, when the beam irradiation is performed from the position facing the flange portion of the other side work as described above, since the flange portion of the one side work is a flat surface, the assist gas of the welding performed at the time of welding The spray is uniformly applied to the welding surface. As a result, the amount of molten metal flowing into the gap between the flange portions formed by the curved portion is reduced, and the beads generated by welding have
No large recesses or through holes are created. Therefore, it is possible to provide high welding strength, enhance the rigidity of the welding member formed by both the works, and prevent the deterioration of the appearance.

Further, as described above, since it is difficult for a large concave portion or through hole to be formed in the bead, it is easy to set the welded portions of both flange portions closer to the curved portion,
As a result, the rigidity of the welding member can be further increased.

According to the structure of claim 2, in addition to the effect of the structure of claim 1, after welding the both flange parts, another member is provided on the outer surface of the flange part of the one side work through a seal member. Since they are joined, the corrosion resistance of the welded member formed by both the works can be enhanced.

That is, when the work is irradiated with the beam, the width of the bead generated by the irradiation, that is, the melting width of the metal, is wide on the beam irradiation surface side and gradually narrows toward the opposite surface side. . Then, the range of the work affected by heat changes depending on the melting width of the metal. In addition, a portion that is thermally affected by welding is likely to be a starting point of rust generation. Accordingly, the beam irradiation surface side has lower corrosion resistance than the opposite surface side. Therefore, if a sealing member having low corrosion resistance is bonded to the beam irradiation surface, for example, another member is bonded via an adhesive, rust is prevented from being generated by the sealing member.
Corrosion resistance is enhanced.

According to the structure of claim 3, in addition to the effect of the structure of claim 1, the corrosion resistance of the pillar portion of the vehicle formed by the one side work and the other side work can be enhanced.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. As shown in FIG. 2, the beam welding apparatus used for beam welding includes a laser oscillator 1, a reflecting mirror 2, a lens 3, a mirror motor 4, a lens motor 5, a beam state monitor 6 and a controller 7.

The laser oscillator 1 generates a laser and outputs it from a laser torch 9 which will be described later.
Is for guiding the laser output from the laser oscillator 1 to a predetermined welding portion of the work 8, and the lens 3 is for focusing the laser reflected by the reflecting mirror 2 on the welding portion of the work 8. The mirror motor 4 rotates the reflecting mirror 2 to change the laser irradiation position, and the lens motor 5 moves the lens 3 so that the laser converges on the welded portion of the work 8. The beam state monitor 6 is an optical monitor of the output of the laser applied to the welded portion of the work 8 and the welding state by the laser. Further, the control device 7 controls the operation of the mirror motor 4 and the lens motor 5 and the operation of the laser oscillator 1 based on the detection state of the beam state monitor 6 and the like.

Next, a method of manufacturing a beam welding member by the above beam welding apparatus will be described. Here, FIG.
The lift gate 12 as a beam welding member provided on the rear surface of the vehicle body 11 in the hatchback vehicle shown in FIG. The lift gate 12 is A- in FIG.
As shown in FIG. 4, which is a sectional view taken along the line A, the outer panel 13, the inner panel 14, and both panels 13
Window portion 15 of the lift gate frame portion 15 formed by 14
The window glass 16 provided in a is provided. The window glass 16 is attached on the flange portion 13 a of the outer panel 13 via an adhesive layer 17.

The lift gate frame portion 15 has a closed cross section formed by the outer panel 13 and the inner panel 14. The inner peripheral side of the outer panel 13 and the inner panel 14 on the side of the window portion 15a is joined by laser welding in a state in which the respective flange portions 13a and 14a are superposed, and the outer peripheral side is connected to the flange portion 1 of the outer panel 13.
3b is joined onto the flange portion 14b of the inner panel 14 by, for example, laser welding in a folded state. The outer surface of the flange portion 13a on the inner peripheral side becomes the seating surface 13b of the window glass 16. Therefore, the flange portion 14a
Is narrower than the flange portion 13a. That is, the flange portion 14a extends to the inner side of the inner panel 14 than the flange portion 13a. In other words, in the inner panel 14, the rising position of the curved portion 14b from the side of the flange portion 14a for forming the closed cross section is higher than that of the outer panel 13 in the flange portion 14a.
It is closer to the edge of. Therefore, the closed cross section is large.

When the lift gate 12 is manufactured, the outer panel 13 and the inner panel 14 in which the flange portions 13a and 14a are overlapped with each other and the flange portions 13b and 14b are subjected to the treatment shown in FIG. 4 are not shown. Secure with clamping means.

Next, as shown in FIG. 1 (a), the laser torch 9 is arranged at a position facing the seating surface 13b of the flange portion 13a. Then, the laser torch 9 is used to irradiate the flange portion 13a with a laser, aiming at a portion of the flange portion 14a in the vicinity of the curved portion 14b, and at the same time as the beam irradiation, or from the side, an assist gas is supplied to the welding portion. To blow. Further, the laser torch 9 and the lift gate frame portion 15 are relatively moved in the longitudinal direction of the flange portions 13a and 14a, so that both flange portions 13a and 14a are moved.
To weld. The laser irradiation position by this is controlled based on the scanning locus programmed beforehand.

At this time, as shown in FIG. 1B, the upper surface of the flange portion 13a which is the laser irradiation surface, that is, the seating surface 1
Since 3b is flat, the amount of metal melted is smaller than in the case where the laser irradiation surface is curved in the direction of the laser torch 9, and the assist gas is sprayed uniformly on the welding surface. As a result, the amount of molten metal flowing into the gap between the flange portions 13a and 14a formed by the curved portion 14b is reduced, and the bead 18 formed by welding does not have a large recess or through hole.

As described above, the flange portions 13a and 14 are formed.
When the welding of a is completed, next, beam welding of the flange portions 13b and 14b is performed by beam irradiation from a position facing the folded portion of the flange portion 13b.

Next, the lift gate frame portion 15 thus obtained is processed in the body assembly process and the painting process. After that, as shown in FIG. 3C, an adhesive agent that becomes the adhesive layer 17 is applied to the seating surface 13b of the flange portion 13a of the lift gate frame portion 15, and the seating surface 13b is placed on the seating surface 13b through the adhesive layer 17. The window glass 16 is attached to.

As described above, in the method of manufacturing the beam welding member, in welding the flange portions 13a and 14a, the bead 18 is formed even when the flange portions 13a and 14a are welded near the curved portion 14b of the flange portion 14a.
Since no large recesses or through holes are formed in the upper part, high welding strength is provided, the rigidity of the lift gate frame part 15 can be increased, and deterioration of the appearance can be prevented. Further, as described above, since it is difficult for a large concave portion or through hole to be formed in the bead 18, it is easy to set the welded portion closer to the curved portion 14b, which further increases the rigidity of the lift gate frame portion 15. Can be increased.

Further, since the laser irradiation is performed from the seating surface 13b of the flange portion 13a on which the adhesive layer 17 is provided, the corrosion resistance of the lift gate frame portion 15 is enhanced. That is, as shown in FIG. 5, in general, when laser irradiation is performed on the work 19, the width of the bead 20, which is generated by the laser irradiation, that is, the melting width of the metal is wide on the laser irradiation surface side and on the opposite surface side. It becomes gradually narrower toward you. Then, the range of the work 19 affected by heat changes in accordance with the melting width of the metal. In addition, a portion that is thermally affected by welding is likely to be a starting point of rust generation. Therefore, the laser irradiation surface side has lower corrosion resistance than the opposite surface side.
Therefore, as described above, the laser-irradiated surface having low corrosion resistance is used as the seating surface 13b of the window glass 16, and the adhesive layer 17 is provided at a portion including the upper surface of the bead 18, so that the rusting on the seating surface 13b is prevented. Is prevented and corrosion resistance is enhanced.

Although the manufacturing method of this embodiment has been described by taking the manufacturing of the lift gate 12 of the hatchback vehicle as an example, the one side work having the flat part and the flat part overlapping with the flat part of the one side work. It is also applicable to beam welding with the other side member having a shape in which a portion following the flat portion is raised through the curved portion. For example, the outer panel 1
By using 3 as a pillar outer and the inner panel 14 as a pillar inner, it is possible to apply to manufacturing of a rear pillar portion, a front pillar portion, a side pillar portion, and the like.

[0026]

As described above, according to the method of manufacturing a beam welding member of the invention of claim 1, the flange portion of the one side work extended to the inside of the workpiece rather than the flange portion of the other side work, and the above flange. The flange portion of the other side work having a shape that rises from the curved portion through the curved portion,
The high-density energy beam is irradiated from a position facing the flange portion of the one-side workpiece to the flange portion near the curved portion of the other-side workpiece, and the both flange portions are welded.

As a result, the amount of molten metal flowing into the gap between the flanges of the one side work and the other side work formed by the curved portion of the other side work is reduced,
The bead produced by welding does not have large recesses or through holes. Therefore, the welded portion has a high welding strength, the rigidity of the welded member formed by both the works can be enhanced, and the deterioration of the appearance can be prevented.

Further, as described above, since it is difficult for a large recess or through hole to be formed in the bead, it is easy to set the welded portions of the both flange portions closer to the curved portion, which results in the beam welding. An effect that the rigidity of the member can be further enhanced is obtained.

The beam welding member manufacturing method according to a second aspect of the present invention is the beam welding member manufacturing method according to the first aspect of the present invention, in which after the welding of the both flange portions, the outer surface of the flange portion of the one side workpiece is welded. In addition, another member is joined via a sealing member.

As a result, in addition to the effect of the first aspect of the invention, since the irradiating surface having a low corrosion resistance is rust-proofed by the sealing member, the welding member formed by the one side work and the other side work is prevented. The effect that the corrosion resistance can be enhanced is exhibited.

A beam welding member manufacturing method according to a third aspect of the present invention is the beam welding member manufacturing method according to the second aspect, wherein the one side work and the other side work are pillar forming members for a vehicle. The other member is a window glass.

Thus, in addition to the effect of the first aspect of the invention, the corrosion resistance of the pillar portion of the vehicle formed by the one-side work and the other-side work can be enhanced.

[Brief description of drawings]

FIG. 1 (a) is a sectional view of a main part of a work showing a method for manufacturing a beam welding member according to an embodiment of the present invention, and FIG. 1 (b).
Is a cross-sectional view of the main part of the work showing the state of the welded portion by laser welding as the beam welding shown in FIG. 4A, and FIG. 6C shows the state in which the window glass is attached after the above welding operation is completed. It is sectional drawing of a workpiece principal part.

FIG. 2 is a block diagram showing a laser welding apparatus for performing the above laser welding.

FIG. 3 is a perspective view of a lift gate manufactured by the above laser welding.

4 is a sectional view taken along the line AA in FIG.

FIG. 5 is an explanatory diagram of a molten state of metal and a heat affected width by the laser welding.

FIG. 6 is a sectional view of a work showing a conventional spot welding method.

FIG. 7 is a cross-sectional view of the vicinity of a rear pillar formed by the above spot welding method.

FIG. 8 is a cross-sectional view of the vicinity of a rear pillar formed by a conventional method for manufacturing a beam welding member.

FIG. 9 is a cross-sectional view showing a state of a bead produced by welding in a rear pillar formed by a conventional method for manufacturing a beam welding member.

[Explanation of symbols]

 1 Laser Oscillator 2 Reflector 3 Lens 4 Mirror Motor 5 Lens Motor 7 Control Device 7 8 Work 9 Laser Torch 13 Outer Panel (Work on One Side) 13a Flange Part 14 Inner Panel (Work on Other Side) 14a Flange Part 14b Curved Part 17 Adhesive Layer (Seal member) 18 beads

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Risuke Nakanishi 3-1, Shinchi, Fuchu-cho, Aki-gun, Hiroshima Mazda Motor Corporation

Claims (3)

[Claims] 1. A flange portion of one side workpiece extending to the inside of the workpiece rather than a flange portion of the other side workpiece, and the flange portion of the other side workpiece having a shape rising from the flange portion via a curved portion. Beams characterized by overlapping and irradiating a high-density energy beam from a position facing the flange part of the one side work to the flange part near the curved part of the other side work, and welding the both flange parts together. Welding member manufacturing method. 2. The manufacturing of a beam welding member according to claim 1, wherein after welding the both flange portions, another member is joined to the outer surface of the flange portion of the one side work through a sealing member. Method. 3. The method for manufacturing a beam welding member according to claim 2, wherein the one-side work and the other-side work are pillar forming members of a vehicle, and the other member is a window glass.