JPH058090A - Method and device for joining band-shaped metallic sheet - Google Patents

Abstract

PURPOSE:To provide the welding method and device which prevent the generation of a crack at the welding start end of a weld zone and can weld band- shaped metallic sheets made of aluminum alloys having 0.1 to 0.5mm thickness to each other at >=5m/min welding speed. CONSTITUTION:The width of the welding groove 31A of a back bar 31 of the welding device 24 is set wider than 1.5mm and, therefore, the crystals of the weld zone 40 are formed to face the directions of the respective band-shaped metallic sheets 10, 22 when the lap or butt parts of the band-shaped metallic sheets 10, 22 are welded to each other in the welding groove 31A of the back bar.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for joining strip-shaped metal plates, and more particularly to a joining method and apparatus for joining flexible strip-shaped metal sheets.

[0002]

2. Description of the Related Art As a method for joining flexible strip-shaped metal thin plates to each other, a trailing end of a preceding strip-shaped metal thin plate and a leading end of a trailing strip-shaped metal thin plate are overlapped and then welded by a welding device, A method of rolling the welded portion with a rolling device is known (Japanese Patent Laid-Open No. 64-27776). According to this method, the step difference in the welded portion can be removed, so that the welded and joined strip-shaped metal plate is smoothly transported while being in contact with the pass roller and sent to the coating device in the subsequent stage, so that the coating process is uniformly performed. .

[0003]

However, when the welded portions of the strip-shaped metal plates which are stacked by the above-described joining method are welded, the welding of the welded portion 6 of the strip-shaped metal plates 2 and 4 is started as shown in FIG. There is a problem that cracks 6 frequently occur at the ends. (Refer to Fig. 6) For aluminum alloys containing manganese and magnesium to some extent, the frequency of cracks can be reduced by welding at a welding speed of 1 to 2 m / min. There is a problem that the sex is lowered.

The present invention has been made in view of such circumstances, and it is possible to weld the overlapped portions of the strip-shaped metal thin plates at a welding speed of 5 m / min or more, and at the welding start end of the welded portion. It is an object of the present invention to propose a joining method and an apparatus for joining strip-shaped metal plates in which cracks do not occur on the surface.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention lays or abuts strip-shaped metal plates on a back bar of a welding apparatus and welds the laid or abutted portion to the back bar. In a belt-shaped metal plate joining device, which is arranged in a groove, welds the overlapping or butt portion with a welding device, and rolls the welded joint portion with a rolling device, the welding groove width of the back bar is 1.5 mm or more. It is characterized by

[0006]

According to the present invention, since the welding groove width of the back bar of the welding device is set to 1.5 mm or more, when the overlapping or abutting portions of the strip-shaped metal plates are welded in the welding groove of the back bar, the crystal of the welding portion is formed. It is formed facing the direction of each strip-shaped metal plate.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of a method and apparatus for joining strip-shaped metal plates according to the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is an illustration of a method and apparatus for joining strip-shaped metal plates according to the present invention. As shown in FIG. 1, the strip metal plate 10 is a roll 1
2 is rewound and rolled on the pass roller 14 to be joined to the joining device 1
6 is transported. The pre-cutting device 18 of the joining device 16 includes two sets of cutters 20, 20. The leading end portion 10A of the strip-shaped metal plate 10 is cut by the pre-cutting device 18 and is precisely attached to the rear end portion 22A of the joining strip-shaped metal plate 22. It is formed so that it can be abutted or superposed. The precut device 18 is not used when the front end portion 10A of the strip-shaped metal plate 10 to be rewound can directly abut the rear end portion 22A of the strip-shaped metal plate 22.

A welding device 2 is provided after the precut device 18.
4 are provided. As shown in FIG. 2, the welding device 24 is composed of clamps 26, 28, a welding torch 30, a back bar 31, and the like. The strip-shaped metal plates 10 and 22 are placed on the upper portion of the back bar 31.
In No. 1, a welding groove 31A is formed at a position where a front end 10A of the strip-shaped metal plate 10 and a rear end 22A of the strip-shaped metal plate 22 are overlapped with each other. The groove width X of the welding groove 31A is set to 1.5 mm. The groove width X of the welding groove 31A is not limited to 1.5 mm and may be set to 1.5 mm or more.

The back bar 31 formed in this way
When the front end 10A of the strip-shaped metal plate 10 and the rear end 22A of the strip-shaped metal plate 22 are overlapped with each other in the welding groove 31A, the clamp 26 holds the front end 10A of the strip-shaped metal plate 10 and the clamp 28 holds the strip-shaped metal plate 22. Hold the rear end 22A. Therefore, the strip-shaped metal plate 10 and the strip-shaped metal plate 22 are superposed. When the strip-shaped metal plates 10 and 22 are overlapped with each other, the overlapped portions are welded by the welding torch 30.

A TIG arc welding method is adopted for the welding torch 30, and other than this welding torch 30, MIG arc welding, gas welding, or laser welding of CO ₂ , YAG or the like may be used. The welding torch 30 melts and welds the end portions 10A, 22A of the strip-shaped metal plates while moving in the width direction of the strip-shaped metal plates 10, 22 from above the abutting portion. When the thickness of the strip-shaped metal plates 10 and 22 is 0.3 mm or less,
Since the strip-shaped metal plates 10 and 22 are easily melted, the strip-shaped metal plate ends 10A and 22A are slightly overlapped and welded.

A rolling device 32 is provided at the subsequent stage of the welding device 24. The rolling device 32 comprises a rolling roller 34 and a back bar 36. The operation of the rolling roller 34 welds the strip metal plate 10 and the strip metal plate 22 together. The part 40 is rolled. Further, an edge trimming device 42 is provided at the subsequent stage of the rolling device 32, and the welding portion 40 of the strip-shaped metal plates 10 and 22 is moved between the pair of die sets 44 and 44 of the edge trimming device 42, as shown in FIG. The strip metal plate 10,
Both ends 40A and 40B of the welded portion 40 of 22 are trimmed. The trimming of both ends 40A, 40B is performed by positioning the die sets 44, 44 in the width direction of the welded portion 40 and punching out the strip-shaped metal plates 10A, 22A and the end portions of the welded portion 40. As the edge trimming method, a laser cutting method, an air plasma cutting method, or the like may be used in addition to the punching method. After trimming in this way, the strip-shaped metal plate is sent out to a coating process or the like.

According to the method and apparatus for joining strip-shaped metal plates according to the present invention configured as described above, the strip-shaped metal plates 10 and 2 are provided.
After the two are superposed, they are welded by the welding device 24, and the welded portion 40 is rolled by the rolling device 32. Therefore, the welded portion 40 has no step, and the belt-shaped metal plates 10 and 20 welded and joined are smoothly transferred in contact with the pass roller to be conveyed to the coating device (not shown) in the subsequent stage, and the coating process is uniformly performed. In this case, the welded portion 40 has a large joint strength and is smoothly transported, so that there is no fear of breakage.
Further, it is possible to uniformly apply the coating to the welding portion 40 without retracting the coating device from the welding portion 40 as in the conventional case.

Further, the work strength of the welded portion 40 is restored by the work hardening due to the rolling treatment, and the joint strength is improved as compared with the case of welding. Therefore, it is particularly effective for crystals, such as aluminum, whose crystals are coarsened by melting during welding. Furthermore, the surface shape of the welded portion 40 is distorted due to heat concentration during welding and pressure fluctuation during rolling, and stress concentrates when tension is applied during transportation, but as shown in FIG.
When the end portion 46 of the welded portion 40 of 22 is trimmed, the stress of the welded portion 40 is reduced and there is no risk of the strip-shaped metal plates 10 and 22 breaking.

Next, the result of comparing the welded portions by welding the width of the welding groove 31A of the back bar 31 in two ways of 1.0 mm and 2.0 mm will be described. The test sample is an aluminum alloy plate having a thickness of the strip metal plates 10 and 22 of 0.3 mm and a thickness of 1.5.
After overlapping mm, the overlapping portion was welded at a welding speed of 6 m / min. FIG. 4 shows the crystalline state of the welded portion when the width dimension of the welding groove 31A is 1.0 mm, and FIG. 5 shows the crystalline state of the welded portion when the width dimension of the welding groove 31A is 2.0 mm. As is clear from FIGS. 4 and 5, the width dimension of the welding groove 31A is 1.
In the case of 0 mm, the crystal direction of the weld is toward the groove corner of the back bar 31, whereas the width dimension of the weld groove 31A is 2.0.
In the case of mm, the crystallographic direction of the weld is toward the strip-shaped metal plates 10 and 22. Moreover, the width dimension of the welding groove 31A is 1.0 mm.
In the case of, a crack of 2.0 to 3.0 mm is generated at the welding start end of the welded portion, whereas when the width dimension of the welding groove 31A is 2.0 mm, the generation of cracks at the welding start end of the welded portion can be prevented. .

In the above embodiment, the strip-shaped metal plates 10 and 22 are joined together.
Although the superposed portions are superposed by a small amount and the superposed portions are welded to each other, the present invention is not limited to this, and the strip-shaped metal plates 10 and 22 may be butted and the butted portions may be welded.

[0016]

As described above, according to the method and apparatus for joining strip-shaped metal plates according to the present invention, the welding groove width of the back bar of the welding device is set to 1.5 mm or more. Alternatively, when the abutting portion is welded in the welding groove of the back bar, the crystal of the welding portion is formed in the direction of each strip-shaped metal plate.

Therefore, it is possible to prevent the occurrence of cracks at the welding start end of the welded portion, and to weld the aluminum alloy strip metal plates having a plate thickness of 0.1 to 0.5 mm at a welding speed of 5 m / min or more. You can

[Brief description of drawings]

FIG. 1 is an explanatory view of a belt-shaped metal plate joining apparatus according to the present invention.

FIG. 2 is an enlarged view of a main part of a belt-shaped metal plate joining device according to the present invention.

FIG. 3 is a plan view showing a state in which the strip-shaped metal plates are welded to each other by the strip-shaped metal plate joining apparatus according to the present invention.

FIG. 4 is a cross-sectional view of a welded portion where band-shaped metal plates are welded together by the band-shaped metal plate joining device according to the present invention.

FIG. 5 is a cross-sectional view of a welded portion in which strip-shaped metal plates are welded together by the strip-shaped metal plate joining apparatus according to the present invention.

FIG. 6 is a plan view showing a state in which band-shaped metal plates are welded together by a conventional band-shaped metal plate joining device.

[Explanation of symbols]

10, 22 ... Strip-shaped metal plate 16 ... Joining device 18 ... Precut device 24 ... Welding equipment 31 ... Back bar 31A ... Welding groove 32 ... Rolling equipment 36 ... Edge trimming device 40 ... Welded part

Claims (2)

[Claims] 1. A welding groove width of a back bar provided in a welding device is set to 1.5 mm or more, and strip metal plates are superposed or abutted on the back bar, and the superposed or abutted portion is backed. A method for joining strip-shaped metal plates, comprising: a step of arranging in a welding groove of a bar; a step of welding the overlapping or abutting portion; and a step of rolling the welded joint portion. 2. The strip-shaped metal plates are superposed or abutted on a back bar of a welding apparatus, and the superposed or abutted portion is arranged in a welding groove of the back bar, and the superposed or abutted portion is welded by the welding apparatus. A joining device for strip-shaped metal plates, which comprises welding and rolling the welded joint with a rolling device, wherein the welding groove width of the back bar is 1.5 mm or more.