JPH0698492B2 - Method of joining strip metal plates - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for joining strip-shaped metal plates, and more particularly to a flexible metal plate.
The present invention relates to a joining method for joining end portions of strip-shaped metal thin plates of Al alloy.

[Prior art]

As a method of joining the strip-shaped metal plates, there is a method of superposing the strip-shaped metal plates and joining them, or a method of butting and joining. FIG. 4 (a) is a perspective view showing a conventional lap joining method. As shown in FIG. 4 (a), the strip-shaped metal plate 70
And the end of the strip-shaped metal plate 72 are overlapped with each other, and the joint surface 73 is adhered by a double-sided adhesive tape or is fused by ultrasonic waves (see JP-A-59-24526, No. 4). (Fig. 6).

Further, FIG. 4 (b) is a perspective view showing a conventional butt joining method for band-shaped metal plates. As shown in FIG. 4 (b), the ends of the strip-shaped metal plates 70, 72 are butted, and the butted joint 75 is joined by the single-sided adhesive tapes 76, 76 (Japanese Patent Laid-Open No. 59-24526). (Fig. 2).

However, according to the conventional joining method of the strip-shaped metal plates as shown in FIG. 4 (a), since there is a step at the joining portion, it is not possible to make smooth contact with the pass roller or the like. Further, in the photosensitive layer coating step in the production of a lithographic printing plate, the coating device must be retracted to prevent damage when the joint portion of the strip-shaped metal plate passes. Even if it is not necessary to retract the coating device, the joint surface 73 adversely affects the coating state and causes quality defects.

In addition to such a problem, the bonding surface 73 is often not adhered over the entire surface, so that the bonding surface 73 may turn over during the transportation of the strip. Further, in the process, when there is a surface treatment step of the strip-shaped metal plate using the treatment liquid, when the strip-shaped metal plate passes through the treatment liquid, foreign matter such as the treatment liquid enters the gap of the bonding surface 73, This causes quality defects in the subsequent process.

Further, in the joining method by abutting shown in FIG. 4 (b), since the single-sided adhesive tapes 76, 76 are used for joining, the joining portion has a difference in thickness due to the tapes 76, 76. This step causes a problem similar to the problem in the lap joining method shown in FIG. 4 (a). Especially with this method,
While being conveyed by a pass roller or the like during the process, the tapes 76, 76 of the abutting portion are offset by the strip-shaped edges of the abutting portion, so that the strength is weakened and there is a problem that the tape is easily cut. Further, such a bonded strip-shaped metal plate is subjected to bending stress when passing through the pass roller, and the bending stress easily causes breakage in the bonded portion. Especially 0.1 mm or
It occurs remarkably in the case of a thin strip shape such as 0.2 mm or in the case where there is a large difference in the thickness of both strip-shaped plates to be joined.

In order to solve these problems, a joining method is used in which band-shaped metal plates are welded to each other and joined, and the welded joint is rolled to eliminate the step difference.In addition, stress concentration occurs in the heat-affected zone generated in the joint by rolling. A joining method for performing difficult processing is disclosed.

Further, since the central portion of the strip-shaped metal plate is more likely to release thermal energy than the both end portions, the welding output of the central portion is set to be larger than that of the both end portions for welding and joining, and the welded joint portion is rolled. A joining method is also disclosed.

In this method, in order to shorten the welding time, a plurality of welding torches are arranged in parallel in the width direction of the strip-shaped metal plate, and a plurality of welding torches are simultaneously used to weld the strip-shaped metal plate to the strip-shaped metal plate. To join.

FIG. 5 is a front view showing a method of welding and joining the joint portion between the strip-shaped metal plate 80 and the strip-shaped metal plate 82 using three welding torches 84, 84, 84. 3 welding torches 84, 84,84
Perform arc start at 86A, 86B, and 86C, respectively, and then move in the right direction (direction of arrow A) in FIG.

[Problems to be solved by the invention]

However, when welding aluminum alloy strip-shaped metal plates to each other by welding, there is a problem that when arc starting is started above the strip-shaped metal plates to start welding, holes frequently occur in the strip-shaped metal plates at the time of arc start.

Further, when the heat input by welding is large, the joint portion is adversely affected, and the joint strength is reduced.

The present invention has been made in view of such circumstances, when joining the band-shaped metal plates of Al alloy by welding, there is no hole at the start of welding, and a method of joining band-shaped metal plates that is unlikely to cause strength reduction due to welding heat. The purpose is to propose.

[Means for solving problems]

The present invention, in order to achieve the above object, in a method for welding and joining the joints in which the ends of the strip-shaped metal plates are overlapped or abutted, TIG welding, in particular, the welding torch for high frequency pulse arc welding An arc is generated at a position away from one end of the joint, and after the arc is generated, the welding torch is moved from one end to the other end of the joint at a moving speed of 5 to 6 m / min to achieve a plate thickness of 0.1 mm to 0.5 mm. The aluminum-alloy strip-shaped metal plates are joined together by welding, and the welded joint is rolled.

[Action]

According to the present invention, the welding speed is set to 5 m / min or more and TIG welding, particularly in high frequency pulse arc welding, the plate thickness is 0.1 mm to 0.5 mm.
Since the band-shaped metal plates of the Al alloy are weld-bonded to each other, the band-shaped metal plate and the band-shaped metal plate can be sufficiently weld-bonded while minimizing the effect of heat on the band-shaped metal plate during welding.
Further, the welding time can be shortened without using a plurality of welding torches. Further, since a single welding torch is used and the arc is started outside the strip-shaped metal plate, it is possible to prevent perforation.

In addition, since welding is performed at a higher speed than in the past, the difference in the ease of heat escape between the central portion and both ends of the strip-shaped metal plate is reduced, and it is not necessary to set the welding output at the central portion to be larger than that at both ends. .

〔Example〕

Hereinafter, preferred embodiments of a method for joining strip-shaped metal plates according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is an explanatory view of a method for joining strip-shaped metal plates according to the present invention. As shown in FIG. 1, an Al alloy strip metal plate 10 is rewound from a roll 12 and rolled on a pass roller 14 to form a joining device 16
Be transported to. The pre-cutting device 18 of the joining device 16 is composed of two sets of cutter blades 20, 20. Tip of strip metal plate 10
10A is cut by the precut device 18 and is formed so that it can be accurately butted or superposed on the rear end portion 22A of the strip-shaped metal plate 22 of Al alloy.

A welding device 24 is provided after the precut device, and the welding device 24 includes clamps 26, 28 and a welding torch 30. The clamp 26 holds the front end portion 10A of the strip-shaped metal plate 10, and the clamp 28 holds the rear end portion 22A of the strip-shaped metal plate 22. Therefore, the front end portion 10A and the rear end portion 22A are abutted against each other as shown in FIG. 2, and the abutted portions are welded by high frequency pulse arc welding. That is, the welding torch 30 moves from the A position to the B position (direction of arrow C) of this abutting portion shown in FIG. 2 to weld the strip-shaped metal plate end portions 10A and 22A.

In the case of the present embodiment, the welding torch 30 moves along the abutting portion of the strip-shaped metal plate at a speed of 6 m / min, and the welding current has a heat amount sufficient to melt the leading end 10A and the trailing end 22A. It is set so that it can be supplied. In this way, when welding the butt portion by high-frequency pulse arc welding, since the arc start is performed at a place outside the strip-shaped metal plate using the single welding torch 30, the hole opening at the arc start of the welding torch 30 is performed. It can be prevented. Furthermore, since the welding torch 30 moves at a speed of 6 m / min, the recrystallized portion can be kept small to minimize the strength decrease due to welding, and the welding cycle time can be reduced without using multiple welding torches. I can.

Further, since the difference in the ease of heat escape between the central portion and both ends of the strip-shaped metal plate is small, uniform welding can be performed with a constant welding output without setting the welding output at the central portion larger than that at both ends. .

FIG. 3 shows a single welding torch at the joint between the strip-shaped metal plates 10 and 22.
FIG. 11 is a front view showing a method of welding and joining using 30. The welding torch 30 starts an arc at the position of 44, and then moves in the right direction (direction of arrow A) in FIG. 3 at a speed of 5 m / min or more to perform welding joining.

A rolling device 32 is provided after the welding device 24.
The rolling roller 34 of 32 rolls the welded joint between the end portions 10A and 22A of the strip-shaped metal plate. By such a rolling process, the step generated in the welded joint is pressed and compressed. Bonding strength is increased by this rolling treatment. This is because the tensile strength reduced by welding is work hardened and recovered by the rolling process, and at the same time, it is processed into a shape in which stress concentration does not easily occur.

Although the strip-shaped metal plate 10 and the strip-shaped metal plate 22 are abutted with each other in the above-described embodiment, the present invention is not limited to this, and they may be minutely overlapped.
When the strip-shaped metal plate 10 and the strip-shaped metal plate 22 are minutely superposed and joined together, a rolling process is particularly required.

Next, a joining portion joined by the joining method of the strip-shaped metal plates according to the present invention (welding speed 5 m / min or more) and welding speed 5 m /
A comparative test with a joined portion joined in less than a minute will be described.

Samples No. 1, No. 2 and No. 3 for testing are 0.24 mm thick and 84 width wide.
A 0 mm Al alloy strip metal plate and a 0.10 mm thick 840 mm wide Al alloy strip metal plate were welded in a state of being overlapped by 1 mm.

Sample No. 1 was joined at a welding speed of 6 m / min, strip-shaped metal plate, Sample No. 2 was joined at a welding speed of 2 m / min, sample No. 3 was joined at a welding speed of 1 m / min. It is a strip-shaped metal plate. The welding current was increased in proportion to the welding speed so that the width of the welded portion was kept constant. The welded portion after welding was rolled under the same conditions.

Using these samples No.1, No.2 and No.3, tension 235k
While g was loaded, it was rotated between two rubber rolls (φ600), 22 rubber rolls (φ200) and two rubber rolls (φ180), and the number of revolutions until cutting was investigated. The result of this pass roller passing test and the time required for welding are
Shown in the table.

As is clear from Table 1, sample No. 1 produced by the method for joining strip-shaped metal sheets according to the present invention passes through the pass roller as compared with sample Nos. 2 and 3 welded at a welding speed of 5 m / min or less. It can be seen that the performance is greatly improved.

Next, a comparative test using a single welding torch and three welding torches will be described.

For test samples No. 4 and No. 5, two strips of Al alloy strip metal plates having a thickness of 0.10 mm and a width of 1030 mm were welded in a state of being overlapped by 1 mm.

Sample No. 4 is a band-shaped metal plate which was joined by a welding speed of 6 m / min by arc starting outside the band-shaped metal plate using a single welding torch. Sample No. 5 uses three welding torches, one of the three is outside the strip-shaped metal plate, and two arc-started inside the strip-shaped metal plate and joined at a welding speed of 2 m / min. Is. The welding current was increased in proportion to the welding speed so as to keep the width of the weld constant.

Table 2 shows the appearance of the test results of these samples No. 4 and No. 5 and the time required for welding.

As is clear from Table 2, Sample No. 4 produced by the method for joining strip-shaped metal sheets according to the present invention is the same as Sample No. 5 using three welding torches at a welding speed of 2 m / min. It can be seen that even if the welding is performed for the welding time, it is possible to join without a hole in the welded portion.

Although the high frequency pulse arc welding has been described in the above embodiment, the same effect can be obtained by other TIG welding.

〔The invention's effect〕

As described above, according to the method for joining strip-shaped metal sheets according to the present invention, the welding speed of TIG welding, particularly high-frequency pulse arc welding is set to 5 m / min or more, so that the sheet thickness is 0.10 mm to 0.50 mm.
l Alloy metal strip metal plates can be sufficiently welded together to minimize the effect of heat on the strip metal plates during welding. Therefore, the recrystallized portion of the strip-shaped metal plate after welding can be reduced, so that the strip-shaped metal plate can be prevented from breaking during the orbiting. Further, it is not necessary to set the welding output at the central portion of the strip-shaped metal plate to be larger than that at both ends.

The cycle time of welding can be reduced without using a plurality of welding torches. Further, by using a single welding torch, it is possible to prevent the formation of holes.

[Brief description of drawings]

FIG. 1 is an explanatory view of a method for joining strip-shaped metal plates according to the present invention,
FIG. 2 is a plan view showing a state in which band-shaped metal plates are welded by the band-shaped metal plate bonding method according to the present invention, FIG. 3 is a front view showing the band-shaped metal plate bonding method according to the present invention, and FIG. (a) and (b) are perspective views of the conventional joining method of a strip-shaped metal plate, FIG. 5 is a front view which shows the method of welding-joining a strip-shaped metal plate using three welding torches. 10, 22 …… Band-shaped metal plate, 16 …… Joining device, 18 …… Precutting device, 24 …… Welding device, 30 …… Welding torch.

Claims (1)

[Claims] Claim: What is claimed is: 1. A method of welding a joining part in which end portions of strip-shaped metal plates are overlapped or abutted with each other, wherein a welding torch for TIG welding, particularly high frequency pulse arc welding, is separated from one end of the joining part. After the arc is generated, the welding torch is moved from one end to the other end of the joint at a moving speed of 5 to 6 m / min to obtain a plate thickness of 0.1 mm.
A method for joining strip-shaped metal plates, which comprises welding the above-mentioned joints between strip-shaped metal plates made of Al alloy having a thickness of 0.5 mm and rolling the welded joints.