JP3222275B2 - Manufacturing method of beam welding member - Google Patents

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 performing 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, is mainly performed in assembling an automobile body. In this spot welding, for example, as shown in FIG.
When the work 51 and the work 52 are welded, it is necessary to form wide flange portions 51a and 52a for being sandwiched between the electrodes 51 and 54 of the welding machine. For this reason, for example, as shown in FIG.
Is formed, the width of the flange portions 56a and 57a of the rear pillar outer 56 and the rear pillar inner 57 increases, and when obtaining a closed cross section of a predetermined size, that is, when securing a predetermined rigidity, an increase in weight is required. It has been invited. Also, during the welding operation, the two electrodes 53.5 are used.
4, it is necessary to secure a moving space, and the shape of the work, the welding position, and the like are easily limited.

Therefore, as described in Japanese Patent Application Laid-Open No. 60-49883, the workpieces 51 and 52 superposed as described above are irradiated with a high-density energy beam such as a laser or an electron beam. It has been proposed to perform beam welding. That is, in this beam welding, it is only necessary that the flange portions 51a and 52a of the works 51 and 52 be set to a width that can be welded by beam irradiation.
Therefore, in the rear pillar 59 shown in FIG. 8, the width of the flange portion 60 a on the one side of the rear pillar outer 60 that is the mounting side of the rear window glass 58 does not change so much because it becomes a seating surface of the rear window glass 58. , The width of the one side flange portion 61a of the rear pillar inner 61 and the other side flange portion 6 of the rear pillar outer 60 and the rear pillar inner 61.
The widths of 0b and 61b can be reduced. Thereby, the weight can be reduced. Further, in beam welding, a beam is irradiated from a position distant from the work, so that it is hard to be limited by the shape of the work, the welding position, and the like, and the above-described problems can be solved.

[0004]

In the above-described beam welding, since the heat generated by the beam irradiation is sequentially transmitted from the part on the beam irradiation side to the part on the opposite side and the members are melted, the beam irradiation is performed. The width of the penetration of the member gradually decreases in the direction. In beam welding, when the gap between members is large, for example, when the gap between the two members is about 40% of the plate thickness of the beam irradiation side member in a state where two members are overlapped, the welding 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 rear pillar 59, it is necessary to weld the vicinity of the portion of the flange portions 60a and 61a where the curvature for forming the closed cross section starts. Therefore, as shown in FIG. 9, when beam irradiation is performed from the narrow flange portion 61 a side, that is, the side where the bending starts first, to the above-described portion of the one flange portion 60 a 61 a, welding is performed. The portion becomes a portion including the curved portion, and a larger amount of metal is melted than when the flat surface is irradiated with the beam. When the assist gas is blown during the beam irradiation from the same direction as the beam irradiation or from the side, the pressure of the assist gas and the convection of the molten metal cause the flange portion 61a.
A large amount of molten metal enters the gap between 60a. As a result, a large recess 62a is formed in the bead 62 generated by welding.
Occurs, or through-holes occur, lowering the welding strength,
This leads to deterioration of appearance. Further, if the welding position is shifted to the end portions of the flange portions 61a and 60a in order to prevent this situation, there is a problem that the welding strength is reduced regardless of the quality of the welding condition.

Accordingly, an object of the present invention is to provide a method for manufacturing a beam welding 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-mentioned problems, a method for manufacturing a beam welding member according to the first aspect of the present invention comprises:
Flange part of one side work and flange part of the other side work
So that it rises from the overlapped part with the curved part
While the other side of the work is formed
To the inside of the work than the flange of the other work
Extending and irradiating a high-density energy beam from the position facing the flange portion of the one-side work to the flange portion near the curved portion on the other side work, and welding the two flange portions. I have.

A method for manufacturing a beam welding member according to a second aspect of the present invention is the method for manufacturing a beam welding member according to the first aspect of the present invention, wherein after the welding of the two flange portions, the outer surface of the flange portion of the one-side work is provided. In addition, another member is joined via a sealing member, for example, an adhesive.

According to a third aspect of the present invention, in the method for manufacturing a beam welded member according to the first aspect of the present invention, 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 first aspect of the present invention, when beam irradiation is performed from the position facing the flange portion of the one-side work to the flange portion near the curved portion of the other side work, the beam becomes the beam irradiation surface. Since the flange portion of the side work is a flat surface, compared to the case where the beam irradiation is performed as described above from the position facing the flange portion of the other work,
The amount of metal melting is reduced. That is, when the beam irradiation is performed as described above from the position opposite to the flange portion of the other work, 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 as described above from the position facing the flange portion of the one-side work, since the flange portion of the one-side work is a flat surface, the assist gas generated during welding is used. Spraying is performed uniformly on the welding surface. As a result, the amount of molten metal flowing into the gap between the two flange portions formed by the curved portions is reduced, and the beads generated by welding include:
No large recesses or through holes are generated. Therefore, it is possible to provide high welding strength, increase the rigidity of the welding member formed by the two works, and prevent the appearance from being deteriorated.

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

According to the configuration of claim 2, in addition to the operation of the configuration of claim 1, after welding of the two flange portions, another member is attached to the outer surface of the flange portion of the one-side work via a sealing member. Since they are joined, the corrosion resistance of the welding member formed by the two works can be increased.

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

According to the third aspect of the invention, in addition to the operation of the first aspect, 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 One 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 control device 7.

The laser oscillator 1 generates a laser and outputs the laser from a laser torch 9 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 converging the laser reflected by the reflecting mirror 2 to the welding portion of the work 8. The mirror motor 4 rotates the reflecting mirror 2 to change the irradiation position of the laser, 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 for monitoring the output of the laser beam applied to the welded portion of the work 8 and the welding state by the laser beam. Further, the control device 7 controls the operation of the mirror motor 4 and the lens motor 5 and controls the operation of the laser oscillator 1 based on the detection state of the beam state monitor 6 and the like.

Next, a method for manufacturing a beam welding member by the above-described beam welding apparatus will be described. Here, FIG.
Assume that a 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 corresponds to A- in FIG.
As shown in FIG. 4 which is a cross-sectional view taken along the line A, the outer panel 13, the inner panel 14, and both panels 13.
The window 15 of the lift gate frame 15 formed by 14
a is provided with a window glass 16. The window glass 16 is mounted on the flange 13 a of the outer panel 13 via an adhesive layer 17.

The lift gate frame 15 has a closed 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 15a is joined by laser welding with the respective flanges 13a and 14a overlapped, and the outer peripheral side is the flange 1 of the outer panel 13.
3b is bonded to 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 a seating surface 13d of the window glass 16. Therefore, the flange portion 14a
Is narrower than the flange 13a. That is, the flange portion 13a is more outer than the flange portion 14a.
It extends to the inside of the panel 13 . In other words, the rising position of the inner panel 14 by the curved portion 14c from the side of the flange portion 14a for forming the closed cross section is smaller than that of the outer panel 13 by the flange portion 14a.
It is near the end of the. Therefore, the closed cross section is large.

When manufacturing the lift gate 12, the outer panel 13 and the inner panel 14 in a state where the flange portions 13a and 14a are overlapped with each other and the processing shown in FIG. 4 is performed on the flange portions 13b and 14b are not shown. It is fixed by clamping means.

Next, as shown in FIG. 1A, the laser torch 9 is arranged at a position facing the seating surface 13d of the flange portion 13a. Then, the laser torch 9 is used to irradiate the flange portion 13a with laser to aim at a portion of the flange portion 14a near the curved portion 14c, and to supply an assist gas to the welding portion from the same direction as the beam irradiation or from the side. Spray. Further, the laser torch 9 and the lift gate frame 15 are relatively moved in the longitudinal direction of the flanges 13a and 14a, so that the two flanges 13a and 14a are moved.
To weld. The laser irradiation position by this is controlled based on a scanning locus programmed in advance.

At this time, as shown in FIG. 2B, the upper surface of the flange portion 13a which is the laser irradiation surface, that is, the seating surface 1
Since 3d is flat, the amount of metal melting is smaller than when the laser irradiation surface is curved in the direction of the laser torch 9, and the assist gas is blown uniformly to the welding surface. As a result, the amount of molten metal flowing into the gap between the flange portions 13a formed by the curved portion 14c is reduced, and no large recess or through hole is formed in the bead 18 generated by welding.

As described above, the flange portions 13a and 14
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 15 thus obtained is processed in a body assembly process and a painting process. Thereafter, as shown in FIG. 3C, an adhesive to be the adhesive layer 17 is applied to the seating surface 13d of the flange portion 13a of the lift gate frame portion 15, and the adhesive layer 17 is applied to the seating surface 13d via the adhesive layer 17. The window glass 16 is attached to the.

As described above, in the method of manufacturing the beam welding member, the bead 18 is used even when the flanges 13a and 14a are welded near the curved portion 14c of the flange 14a in welding the flanges 13a and 14a.
Since no large concave portion or through hole is formed in the lift gate frame, it is possible to provide a high welding strength, increase the rigidity of the lift gate frame portion 15, and prevent the appearance from being deteriorated. Further, as described above, since a large concave portion or a through hole is unlikely to be formed in the bead 18, the welded portion is formed by the curved portion.
It is easy to set a position closer to the position 14c , whereby the rigidity of the lift gate frame 15 can be further increased.

Further, since the laser irradiation is performed from the seating surface 13d of the flange portion 13a on which the adhesive layer 17 is provided, the corrosion resistance of the lift gate frame portion 15 is improved. That is, as shown in FIG. 5, generally, when the laser irradiation is performed on the work 19, the width of the bead 20 generated by the laser irradiation, that is, the melting width of the metal is wide on the laser irradiation surface side, and is opposite to the laser irradiation surface side. It gradually narrows toward it. The range affected by the heat in the work 19 changes according to the melting width of the metal. In addition, a portion that is thermally affected by welding tends 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 irradiation surface having low corrosion resistance is used as the seating surface 13d of the window glass 16, and the adhesive layer 17 is provided on the portion including the upper surface of the bead 18, so that the rust on the seating surface 13d is reduced. Is prevented, and the corrosion resistance is enhanced.

Although the manufacturing method of this embodiment has been described by taking the manufacture of the lift gate 12 of a hatchback car as an example, one side work having a flat portion and a flat portion overlapping with the flat portion of the one side work are described. The present invention is also applicable to beam welding with the other side member having a shape in which a portion following the flat portion rises 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 can be applied to the manufacture of a rear pillar, a front pillar, a side pillar, and the like.

[0026]

As is evident from the foregoing description, the manufacturing method of beam welding member of the invention of claim 1, whereas the flange portion of the side workpiece and other
Curved from the overlapped part with the flange of the workpiece
Forming the work on the other side so that it rises through the
The flange of one workpiece on the other side
At the same time, the high-density energy beam is radiated from the position facing the flange of the one-side work to the flange near the curved part on the other-side work. In this configuration, the parts are welded.

This reduces 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,
There are no large recesses or through holes in the beads generated by welding. Therefore, the welded portion has high welding strength, can increase the rigidity of the welded member formed by the two works, and can prevent the appearance from being deteriorated.

Further, as described above, since a large concave portion or a through hole is unlikely to be formed in the bead, it is easy to set the welded portion of the two flange portions closer to the curved portion, thereby enabling the beam welding. There is an effect that the rigidity of the member can be further increased.

A method of manufacturing a beam welding member according to a second aspect of the present invention is the method of manufacturing a beam welding member according to the first aspect of the present invention, wherein the outer surface of the flange portion of the one-side work is welded after the welding of the two flange portions. Further, another member is joined via a sealing member.

Thus, in addition to the effect of the first aspect of the present invention, since the rust prevention of the beam irradiation surface having low corrosion resistance is performed by the sealing member, the welding member formed by the one side work and the other side work can be prevented. This has the effect of increasing corrosion resistance.

According to a third aspect of the present invention, in the method for manufacturing a beam welding member according to the second aspect, the one side work and the other side work are pillar forming members of a vehicle. In this case, the other member is a window glass.

Thus, in addition to the effect of the first aspect, 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 the drawings]

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

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 laser welding.

FIG. 4 is a sectional view taken along line AA in FIG. 3;

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

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 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 generated by welding in a rear pillar formed by a conventional method for manufacturing a beam welding member.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 laser oscillator 2 reflecting mirror 3 lens 4 mirror motor 5 lens motor 7 controller 7 8 work 9 laser torch 13 outer panel (one side work) 13a flange section 14 inner panel (other side work) 14a flange section 14c curved section 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 Co., Ltd. (56) References JP-A-63-108979 (JP, A) 6-179086 (JP, A) Japanese Utility Model 1987-143573 (JP, U) Japanese Utility Model 1988-123375 (JP, U) Japanese Utility Model 2-123326 (JP, U) Japanese Utility Model 2-114185 (JP, U) U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B23K 26/00 B23K 15/00 B62D 25/00

Claims (3)

(57) [Claims] 1. A flange part of a work on one side and a work on the other side.
From the overlapped part with the flange part of the
While forming the other side work so that it rises, the flange part of one side work is
From the position facing the flange portion of the one-sided work, and irradiating a high-density energy beam to the flanged portion near the curved portion on the other-sided work. A method for producing a beam welding member, characterized by welding. 2. The beam welding member according to claim 1, wherein after welding the two flange portions, another member is joined to an outer surface of the flange portion of the one-side work via a sealing member. Method. 3. The method according to claim 2, wherein the one side work and the other side work are pillar forming members of the vehicle, and the other member is a window glass.