JPS63108979A - Welding method by high-energy beam - Google Patents

Abstract

PURPOSE:To perform the accurate welding at a high speed by mating a recessed part and a projecting part preformed with each other and holding the mated parts between rollers with corresponding shapes to adhere the mated parts by pressing and moving a welding beam with the rollers at the same time to perform the welding. CONSTITUTION:Flange parts 11 and 21 on which the projecting part 3 and the recessed part 4 are preformed are superposed. Next, the superposed parts are held between rollers 5 and 6 and adhered by pressing while rolling the rollers 5 and 6 and the flange parts 11 and 21 are welded while projecting the welding beam 70. The certain welding at a high speed can be performed by this method.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a welding method using a high-energy beam, which is applied to welding overlapping members such as overlapping welding of fuel tank flanges in automobiles.

(Prior Art) Conventionally, welding using a high-energy beam such as a laser beam or an electron beam has been applied to overlap welding of thin plates such as the flange portion of an automobile fuel tank because of its high welding speed. In this welding, it is necessary to bring the joint surfaces of the members to be welded into close contact in order to prevent welding defects from occurring. For this reason, for example, in Japanese Patent Application Laid-Open No. 60-49883, in order to bring the members to be welded into close contact with each other, a pressure roller that moves while pressing the members is disposed in front of the welding beam in the traveling direction. something is proposed.

However, in the above device, since the rollers are transferred with the member sandwiched between a pair of upper and lower rollers, it is possible to prevent the sandwiched member from shifting in the direction of movement of the rollers, but in the direction perpendicular to the direction of movement. It is unavoidable for the welding line to shift, and for this reason, there is a problem in that the welding line cannot be accurately set at a predetermined position.

(Purpose of the Invention) This invention was made to solve such conventional problems, and it is possible to perform high-speed welding using a high-energy beam, and also to prevent misalignment of overlapped members. The purpose of the present invention is to provide a welding method using a high-energy beam that can accurately set a welding line while preventing such problems.

(Structure of the Invention) This invention involves forming concave and convex portions that fit into each other continuously along the welding position in advance on a pair of members that are superimposed on each other and welding. The two members are pressed together by sandwiching the uneven portion between row arms having a shape corresponding to the above, and the row rows are moved together with the welding beam to continuously weld the positions close to the uneven portion.

In the above configuration, the fitting of the uneven parts prevents the members from moving in a direction perpendicular to the direction in which the rollers move, and the rollers are guided by the uneven parts and move while pressing against the uneven parts, so that the rollers can move at high speed. This allows for reliable welding.

(Embodiment) In FIG. 1, an upper tank member 1 and a lower tank member 2 each formed of a thin plate have flange portions 11 and 21 formed at their peripheral edges.
These are overlapped to form a tank such as an automobile fuel tank.

As shown in FIG. 2, the flanges 11 and 21 of this tank have a convex portion 3 and a concave portion 4, respectively, formed at the center in the width direction. It is formed around the entire circumference. A convex portion formed on the back surface of the concave portion 4 is fitted into a concave portion formed on the back surface of the convex portion 3, and the flat flange surfaces on both sides thereof are overlapped in close contact with each other.

The upper tank member 1 and the lower tank member 2 are each integrally formed from a plate material by press molding.
The convex portion 3 or the concave portion 4 may be simultaneously formed on the flange portion 11° 21 during the molding.

Furthermore, an upper roller 5 and a lower roller 6 are pressed onto the upper surface of the flange section 11 and the lower surface of the flange section 21, respectively, so that the flange sections 11 and 21 are sandwiched between the rollers 5 and 6. The rollers 5 and 6 are rotatably held by horizontal shafts 50 and 60 at the ends of arms 51 and 61 of drive means, not shown, respectively.

The pressing surface of the roller 5 has four parts 53 at the center in the width direction;
Flat surfaces 52 are formed on both sides thereof, and a convex portion 63 at the center in the width direction and flat surfaces 62 on both sides are formed on the pressing surface of the roller 6.

The convex part 3 is fitted into the concave part 53 of the roller 5, and the convex part 63 of the roller 6 is fitted into the concave part 4 of the flange part 21. It is arranged so as to press the flat parts on both sides.

Then, high energy is radiated from the nozzle 7 of the welding device (not shown) to the flat part of the flange part on the rear side in the direction of movement of the roller, inside the pressing part by the roller 5.6 (on the opposite side from the peripheral end of the flange part). A beam 70 is irradiated.

Note that in the illustrated example, a gap 10 is formed between the convex portion 3 and the concave portion 4, but this is preferable because the flat portions on both sides of the gap 10 are brought into close contact with each other more reliably.

In the above configuration, the flanges 11 and 21, in which the convex part 3 and the concave part 4 are formed in advance, are overlapped to fit the convex part 3 and the concave part 4, and the rollers 5 and 6 are used to form the convex part 3 and the concave part 4. While the rollers 5 and 6 are sandwiched between the rollers 5 and 6, the flat part of the flange part 11.21 on the inner side of the rear part is continuously welded while irradiating the beam 70. In this case, the welding part is sandwiched between the rollers 5 and 6 and is in perfect contact with each other, so that good welding is achieved, and the flanges 11 and 21 are connected to the convex part 3.
Since the relative movement in the lateral direction is restrained by the fitting between the holder and the recess 4, displacement in the lateral direction is reliably prevented, and therefore the weld line can be accurately formed at a predetermined position.

Further, since the rollers 5 and 6 are guided by the convex portion 3 and the concave portion 4, there is an advantage that the tracing mechanism for regulating the movement path for the rollers 5 and 6 may be rough. Furthermore, by forming the uneven portion on the flange portion, there is an advantage that the rigidity of the flange portion itself is increased.

In addition, although the above-mentioned embodiment illustrated welding of the flange portion of the peripheral edge of the fuel tank, the present invention is not limited to this, and the above-mentioned method can be applied as long as a pair of members are overlapped and welded continuously using a high-energy beam. Similarly applicable.

(Effects of the Invention) As explained above, the present invention forms concavo-convex portions continuous in the direction of the welding line on stacked members and welds the members by sandwiching them between rollers while fitting each other. The fitting of the uneven parts prevents the members from moving in a direction perpendicular to the direction in which the rollers travel, and the rollers move while pressing around the uneven parts, making it possible to perform reliable welding at high speed. It is possible.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a state in which the invention is implemented, and FIG. 2 is an enlarged sectional view of a welded portion thereof. 1... Upper tank member, 2... Lower tank member, 3
... Convex portion, 4... Concave portion, 5, 6... Roller, 70
...Beam, 11.21...Flange part, 53...
- Concave portion of the roller, 63... Convex portion of the roller.

Claims (1)

[Claims] 1. On a pair of members to be overlaid and welded, a concave and convex portion that fits into each other is formed continuously along the welding position in advance, and the concave and convex portion is fitted together, and a roller having a shape corresponding to the concave and convex portion is used. A welding method using a high-energy beam, characterized in that both members are pressed together by sandwiching the uneven portion, and a roller is moved together with the welding beam to continuously weld positions close to the uneven portion.