JPH07116875A - Beam welding method - Google Patents

Abstract

PURPOSE:To prevent the generation of a strain on a panel member due to heat, and to provide a beam welding method by which the attachment of welding spatters to the outter surface of the panel member can be prevented at the time of welding by overlapping the tip parts of the panel members. CONSTITUTION:The mating face parts 44 of the joint flange inner 3 of a rear pillar inner panel 1 and the joint flange outer 4 of a rear pillar outer panel 2, are aligned. The tip part 3A of the joint flange inner 3, is allowed to project outside the mating face part 4A of the joint flange outer 4, and its projection quantity (s) is made almost equal to the thickness of the joint flange inner 3. At this time, the flared part 4B of the joint flange outer 4, is projected larger than the tip part 3A of the joint flange inner 3. At the state in which the mating face parts 4A of the joint flange inner 3 and the joint flange outer 4, are aligned, the end face of the tip part 3A of the joint flange inner 3, is irradiated by an energy beam R with a high density, such as a laser beam.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a beam welding method in which a high-density heat source such as a laser is used and a high-density energy is applied as a beam to a joint in a non-contact state to perform welding.

[0002]

2. Description of the Related Art Conventionally, spot welding has been generally used as a joining means for joining panel members in an automobile body, for example, joining means for a flange joining portion between an inner panel and an outer panel. In spot welding, a pair of electrodes are opposed to each other. Since the electrodes are contacted with each other with the joint formed in the lap joint interposed therebetween, the area of the joint is equal to or larger than the area where the electrode can sufficiently abut, and It is necessary to secure a flat part where the electrodes come into contact, and the joint part must be enlarged.For example, the flange joint part between the inner panel and the outer panel must have a large flange width. This is one of the factors that hinders the reduction of the load, and the joint formed by the curve such as the flange of the wheel house has a flatness of the joint. That there was a problem that it is difficult Kusuru. Recently, in order to solve these problems, instead of spot welding, a high-density heat source such as a laser is used,
It has been proposed to use beam welding in which high-density energy is applied as a beam to a joint in a non-contact state to perform welding. For example, in Japanese Unexamined Patent Publication No. 56-202091, the flange portions of the two stacked panel members are pressure-held by a pressure roller, and the flange portions are continuously moved by the rotation of the pressure roller. A method is described in which a laser beam is made incident from the side in parallel to the mating surface of the flange portion and locally melted to perform welding.

[0003]

However, in the above-mentioned conventional beam welding method, a flare joint is used to join the outer panel a and the inner panel b (see FIG. 7).
B)), the laser beam R is reflected on the inner surfaces of the flange c of the outer panel a and the flange d of the inner panel b and is concentrated on the joint between the flanges c and d (see FIG. 7B), and the joint is heated to a high temperature. Thus, the molten metal portion e is formed, and if the welding time is lengthened in order to obtain sufficient joint strength, there is a problem in that the outer panel a and the inner panel b, particularly the outer panel a, are distorted due to the influence of heat. Further, when the edge joint is adopted, there is a problem that the weld metal e melts down or the spatter f adheres to the outer panel a and the inner panel b, particularly the outer panel a (see FIG. 8).

An object of the present invention is to prevent the panel member from being distorted by heat when overlapping and welding the end portions of the panel member, and to prevent welding spatter from adhering to the outer surface of the panel member. It is to provide a beam welding method that can be performed.

[0005]

In order to achieve the above object, the beam welding method of the present invention is a joint for joining two panel members, and the joint end portion of one panel member (for example, outer panel) is used. While extending and bending outward in a flare shape and then projecting, the joint end portion of the other panel member (for example, inner panel) is protruded toward the end face in the flare joint end portion of the panel member (outer panel). It is projected in a substantially linear shape with a smaller amount of projection than that, and the high-density energy beam is radiated toward the mating surface portion of both panel member joints toward the above-mentioned substantially linear protruding end portion.

[0006]

[Function] Since the portion to which the high-density energy beam is directly irradiated is close to the substantially linear projecting end portion of the mating surface of both panel member joints, a high temperature portion is generated at the substantially linear projecting end portion. It will be melted, the molten metal will flow into the space part of the mating surface part of both panel member joints, the thermal effect on the panel member provided with the flared joint ends will be small,
It is possible to prevent the occurrence of distortion and the like. Further, since the amount of protrusion of the flared joint end is larger than the amount of protrusion of the substantially linear joint end, there is a risk that molten metal may flow down and adhere to the outer surface of the panel member having the flared joint end. It is also possible to prevent the molten spatter from adhering to the outer surface of the panel member having the flared joint end portion.

[0007]

EXAMPLE As an example of the present invention, a rear pillar inner panel 1 shown in FIG. 3 and a rear pillar inner panel 1 shown in FIG.
What uses the welding method of the present invention for joining with the rear pillar outer panel 2 shown in FIG. Wheel house part 1 of a substantially arc shape provided on the rear pillar inner panel 1.
A joint flange inner 3 is provided in A so as to project in a substantially arc shape, and the joint flange inner 3 extends in a substantially straight line along the joint surface CL (see FIG. 4).

On the other hand, a joint flange outer 4 is provided in a substantially arcuate shape on a wheel house portion 2A of a substantially arcuate shape provided on the rear pillar outer panel 2, and the joint flange outer 4 and a mating surface portion 4A along a joint surface CL. The flare portion 4B is bent outward from the mating surface CL, that is, in a direction away from the joint surface CL and extends outward to form a step 4C (see FIG. 6).

During welding for joining the rear pillar inner panel 1 and the rear pillar outer panel 2, as shown in FIG. 1, the joint flange inner 3 of the rear pillar inner panel 1 is joined.
And the joint flange outer 4 of the rear pillar outer panel 2
Align the mating surface 4A of the fitting flange inner 3
It is advisable that the tip 3A of the above is projected outward from the mating surface portion 4A of the joint flange outer 4 and the projection amount s is made substantially equal to the plate thickness of the joint flange inner 3. At this time, the flared portion 4B of the joint flange outer 4 is not
3A protrudes more than the tip 3A. With the joint flange inner 3 and the joint surface 4A of the joint flange outer 4 matched, a high-density energy beam R such as a laser beam
Is irradiated toward the end face of the tip 3A of the joint flange inner 3.

With the above structure, the tip 3A of the joint flange inner 3 is heated and melted by the high-density energy beam R, and the molten metal M is formed along the lower end of the flare portion 4B of the joint flange outer 4 in the space of the mating surface portion. Since it flows and is stored, the molten metal M does not flow to the outside of the joint flange outer 4, that is, the rear pillar outer panel 2, and welding spatter does not adhere (see FIG. 2). Also,
Since the tip end 3A of the joint flange inner 3 is irradiated with the high-density energy beam R, the amount of heat transferred to the joint flange outer 4, that is, the rear pillar outer panel 2 is small, and the thermal influence such as distortion is suppressed.

When the joint flange inner 3 is sufficiently thicker than the joint flange outer 4, the irradiation position of the high-density energy beam 5 at the end face of the joint flange inner 3 is larger than the joint thickness outer line 4 than the plate thickness center line. By setting the position closer to, the molten metal M can be reliably poured into the mating surface.

[0012]

Since the present invention is constructed as described above, it has the following effects. Since the part directly irradiated with the high-density energy beam is near the substantially linear projecting end of the mating surface part of both panel member joints, a high temperature portion is generated at the substantially linear projecting end and is melted. Therefore, the molten metal flows into the space portion of the mating surface portion of both panel member joints, the thermal effect on the panel member provided with the flared joint ends is reduced, and the occurrence of distortion or the like can be prevented. Further, since the amount of protrusion of the flared joint end is larger than the amount of protrusion of the substantially linear joint end, there is a risk that molten metal may flow down and adhere to the outer surface of the panel member having the flared joint end. It is also possible to prevent the molten spatter from adhering to the outer surface of the panel member having the flared joint end portion.

[Brief description of drawings]

FIG. 1 is an enlarged sectional view of an essential part showing an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of an essential part of a joint obtained by applying the present invention.

FIG. 3 is a perspective view of a rear pillar inner panel to which the present invention is applied.

FIG. 4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is a side view of a rear pillar outer panel to which the present invention is applied.

6 is a sectional view taken along line VI-VI in FIG.

FIG. 7A is an enlarged cross-sectional view of an essential part showing a conventional flare joint, and FIG. 7B is an explanatory view.

FIG. 8 is an enlarged sectional view of an essential part showing a conventional lip joint.

[Explanation of symbols]

1 Rear Pillar Inner Panel, 1A Wheelhouse 2 Rear Pillar Outer Panel, 2A Wheelhouse 3 Joint Flange Inner, 3A Joint Flange Inner Tip 4 Joint Flange Outer, 4A Mating Surface, 4B Flare CL Joint, R High Density Energy beam

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mitsugu Fukahori No. 3 Shinchi Fuchu-cho, Aki-gun, Hiroshima Prefecture Mazda Co., Ltd. (72) Inventor Katsunori Hanakawa No. 3 Shinchi, Fuchu-cho, Aki-gun, Hiroshima Mazda Corporation Within

Claims (1)

[Claims] 1. A joint for joining two panel members, comprising:
While extending the joint end of one panel member and bending it outwardly in a flare shape so as to project, the joint end of the other panel member in the end face direction is the flare joint end projection amount of the panel member. A beam welding method, characterized in that the high-density energy beam is projected in a substantially linear shape with a smaller amount of projection than that, and the high-density energy beam is irradiated toward the end of the substantially linear projection of the mating surface portions of both panel member joints.