JPH0471794A - Welding method - Google Patents

Abstract

PURPOSE:To perform strong butt welding of both cut end faces with high surface accuracy in performing butt welding on the cut end faces of sheet metal such as a steel sheet by squeezing the cut end faces of the sheet metal and forming buildings up on both side edges. CONSTITUTION:After the vicinities of the cut end faces E of the steel sheet 1 are clamped from the upper and lower surfaces by clampers 4, the peripheral surface of a drum-shaped roller 5 having a projecting part 51 on the central part of the peripheral surface is opposed to the cut end faces E and when the roller 5 is rotated forcibly and moved in the longitudinal direction of the steel sheet 1, namely, in the butt direction and the above-mentioned cut end faces E are pressurized by the central part of the peripheral surface of the roller 5, the end faces E are squeezed and buildings up 6 and 6 are formed on both side edges of the cut end faces and simultaneously, the cut end faces are finished smoothly by the roller 5. After the end parts 11 and 11 of the steel sheet 1 are clamped by clampers 7, the abutted cut end faces E and E are then welded together by a laser beam. At this time, a recessed part formed on a weld line is embedded by the above-mentioned building up 6. Strong butt welding with high surface accuracy can be then performed.

Description

DETAILED DESCRIPTION OF THE INVENTION A9 Object of the Invention (1) Industrial Application Field The present invention relates to a method for butt welding cut end surfaces of thin metal plates such as thin steel plates.

(2) Conventional technology A welding technology that uses a high-density heat source of a laser beam to weld thin metal materials is already known (Mechanical Engineering Complete Book Volume 23, Welding Engineering 23 (published by Corona Publishing). ), see Chapter 23° “Recent Welding Technology”).

(3) Problems to be Solved by the Invention In laser welding, the laser beam irradiation causes a large penetration into the material to be welded, so when butt-cutting cross sections of thin steel sheets are laser welded, certain welding conditions must be met. For example, the thickness of the thin steel plate is 2.0 to 4. OLllm
The welding clearance between the cut end faces is 0.
If the clearance is 0.02m+ or more, a recess will be generated along the welding line due to melt penetration of the steel plate by laser beam irradiation, and the surface accuracy of welding will deteriorate.

However, when a thin steel plate 01 with a thickness of 2.0 to 4.0 mm is actually sheared and cut (precision punched), the cut end surface E' has a height difference of 0.03 to 0.05 m, as shown in Figure 3. When the cut end surfaces E' are brought together for butt welding, the clearance between them becomes 0.06~0.1O++a as shown in Fig. 4, which is the laser welding condition described above. This greatly exceeds the clearance of 0.02 m or less, and a recess that exceeds the allowable range occurs in the weld line, making it impossible to apply to items where the welded surface is used as is, such as the wheel rim of a vehicle wheel. There is a problem.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a welding method that enables strong and accurate welding of the cut end face of a thin metal plate such as a thin steel plate with no recesses on the welding surface. It is something to do.

B0 Structure of the Invention (1) Means for Solving the Problems To achieve the above object, the present invention provides a welding method in which cut end surfaces of thin metal plates such as thin steel plates are butted together and both cut end surfaces are welded. The cut end face of the thin metal plate is crushed to form overlays on both side edges thereof, and then the both end faces are brought together and welded.

(2) Function When butt welding the cut end faces of thin metal plates such as thin steel plates, the cut end faces are crushed to form overlays on both side edges, and then both cut end faces are butted together and welded. do. This enables strong butt welding with good surface precision.

(3) Examples An embodiment of the present invention will be described below with reference to the drawings.

(1) First, as shown in FIG. 1(A), a strip-shaped thin steel plate 1 is prepared by shearing and cutting a coil material of a constant width of a thin steel plate.

■ Next, as shown in FIG.
+ is made into a fluff, the cut end surfaces EE are butted together, and they are welded by CO2 laser welding to produce an annular material 2.

(2) The annular material 2 is then subjected to appropriate machining to produce the wheel rim 3 of the wheel.

In this case, the welded part is processed as it is without any post-processing.
Utilized.

By the way, the welding step (2) above is performed as follows.

The cut end faces E and E of the thin steel plate 1 are subjected to end face processing prior to CO□ laser welding.

(i) As shown in FIG. 2(A), after the clamper 4 clamps the vicinity of the cut end surface E of the thin steel plate 1 from the upper and lower surfaces, a protrusion 51 is attached to the cut end surface E at the center of the outer peripheral surface.
The outer peripheral surfaces of drum-shaped rollers 5 facing each other are moved in the longitudinal direction of the thin steel plate 1, that is, in the abutting direction while the rollers 5 are forcibly rotated, and the center portion of the outer peripheral surface of the rollers 5 is moved to the cut end surface E. When pressurized, the cut end surface E is crushed to form overlays 6, 6 on both side edges of the cut end surface, and at the same time, the cut end surface is smoothed by the rollers 5.

(11) Next, the cut end surfaces processed as described above are butted together as shown in FIG. 2(B).

(in) Cut end surfaces E, which are butted together after the end portions 1+ and It of the thin steel plate 1 are clamped by the clamper 7,
E are welded together using a laser beam from a COz laser welding machine 8.

At this time, the recess formed in the weld line by laser welding is filled with the overlay 6. It is also possible to perform strong butt welding with good surface precision.

In addition, in the above example, the case where the method of the present invention was applied to CO2 laser welding was explained, but this can also be applied to micro laser welding, electron beam welding, etc., and the method of the present invention is also applicable to the above-mentioned welding. It can also be applied to welding cut ends of other thin metal plates.

Further, in the above embodiment, a roller is used as a means for forming a build-up on the cut end face of a thin steel plate, but it goes without saying that other means may be used for forming the build-up.

Further, in the above embodiment, both cut end surfaces of the two thin plates were welded, but the cut end surfaces of two thin plates may be welded together.

Effects of the C0 Invention As described above, according to the present invention, in a welding method for butt welding the cut end faces of thin metal plates such as El steel sheets, the cut end faces are crushed to form overlays on both side edges thereof. Then, since the two cut end surfaces were butted against each other and welded, strong butt welding with good surface precision can be performed.

[Brief explanation of drawings]

Figures 1 (a), (b) and (c) show the process of manufacturing wheel rims from thin steel sheets;
), (B), and (C) are process diagrams showing the welding process according to the welding method of the present invention, FIG. 3 is a cross-sectional view of the sheared cut end surface of an I plate steel plate, and FIG. 4 is a cross-sectional view of the cut end surfaces when they are butted together. It is a diagram. 1... Thin steel plate, 6... Overlay, E... Cut end surface Fig. 3

Claims (1)

[Claims] 1. By butting together the cut end surfaces of thin metal plates such as thin steel plates,
A welding method in which both cut end faces are welded, characterized in that the cut end face of the thin metal plate is crushed to form overlays on both side edges thereof, and then the both end faces are brought together and welded. Method. 2. The welding method according to item 1, wherein the welding is laser welding.