JPH0299275A - Method for joining beltlike sheet metal - Google Patents

Abstract

PURPOSE:To suppress the influence of heat given to the title beltlike sheet metals to the minimum by specifying the welding time of high-frequency pulse arc welding, and welding and joining the Al alloy beltlike sheet metals having specific sheet thickness to each other and rolling a welded and joined part. CONSTITUTION:At the time of welding and joining the jointing part between the Al alloy beltlike sheet metals 10 and 22 having 0.1-0.5mm sheet thickness by using a single welding torch 30, the welding speed is set at >=5m/min. A rolling device 32 is provided at the rear stage of welding device 24 and a rolling roll 34 of the rolling device 32 rolls the welded and joined part between the beltlike sheet metal ends 10A and 22A. By this method, the influence of heat given to the beltlike sheet metals can be suppressed to the minimum and a recrystallized part of the beltlike sheet metals after welding can be reduced and the rupture of the beltlike sheet metals at the time of turning is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for joining strip-shaped metal plates, and particularly relates to a joining method for joining ends of flexible Al alloy strip-shaped thin metal plates. .

[Prior art]

Methods for joining belt-shaped metal plates include a method in which the belt-shaped metal plates are joined by overlapping each other, and a method in which the belt-shaped metal plates are joined by butting each other. FIG. 4(a) is a perspective view showing a conventional overlapping joining method. As shown in FIG. 4(a), a band-shaped metal plate 70
and the end of the band-shaped metal plate 72 are overlapped, and the joining surface 73 is adhered with double-sided adhesive tape or fused by ultrasonic waves (see No. 4 of Japanese Patent Laid-Open No. 59-24526). (Fig. and Fig. 6).

Further, FIG. 4(b) is a perspective view showing a conventional butt joining method of band-shaped metal plates. As shown in FIG. 4(b), the ends of the band-shaped metal plates 70, 72 are butted against each other, and the butted joint portion 75 is joined with one-sided adhesive tape 76, 76 (see JP-A No. 59-24526). Figure 2)
.

However, in the conventional method of joining belt-shaped metal plates as shown in FIG. 4(a), there is a difference in the joining part, so that it is not possible to make smooth contact with a pass roller or the like.

In addition, in the photosensitive layer coating process in the manufacture of lithographic printing plates,
The applicator must be retracted to prevent damage when the joint of the metal strip passes through it. Further, even when there is no need to retreat the coating device, the bonding surface 73 adversely affects the coating state and causes quality defects.

In addition to this problem, since the joint surface 73 is often not bonded over the entire surface, the joint surface 73 may be bonded while the strip is being transported.
3 may be turned over. In addition, if there is a surface treatment process for the strip metal plate using a treatment liquid, when the strip metal plate passes through the treatment liquid, foreign matter such as the treatment liquid may enter the gap between the joint surfaces 73. This may cause quality defects in subsequent processes.

Furthermore, in the joining method by butting shown in FIG. 4(b), since the joining is performed using the one-sided adhesive tape 76, 76, a difference in thickness occurs at the joining portion due to the tape 76, 76. This level difference causes a problem similar to the problem in the overlapping joining method shown in FIG. 4(a). In particular, in the case of this method, the tape 76, 76 at the abutting section is damaged by the edge of the strip at the abutting section while being conveyed through the process by a pass roller, etc., which weakens the strength and makes it easy to cut. There is a point. Further, such a bonded band-shaped metal plate is subjected to bending stress when passing through the pass roller, and this bending stress tends to cause breakage at the bonded portion. This is particularly noticeable when the strip plates are thin, such as 0.1 mm to 0.2 mm, or when there is a large difference in thickness between the two strip plates to be joined.

In order to solve these problems, we have developed a joining method in which metal strips are welded together and the welded joint is rolled to eliminate the level difference.In addition, stress concentration occurs in the heat-affected zone that occurs at the joint due to rolling. A joining method that performs difficult processing is disclosed.

In this method, in order to shorten the welding time, multiple welding torches are arranged in parallel in the width direction of the strip metal plates, and multiple welding torches are used simultaneously to weld the strip metal plates. Join.

FIG. 5 is a front view showing a method of welding and joining a joint between a band-shaped metal plate 80 and a band-shaped metal plate 82 using three welding torches 84, 84, and 84. 3 welding torches 8
4.84.84 performs an arc start at 86A, 86B, and 86C, respectively, and then moves to the right (in the direction of the arrow) in FIG. 5 at a speed of 1 to 2 m to perform welding.

[Problem that the invention seeks to solve]

However, when welding band-shaped metal plates of AN alloy to each other, if welding is started by arc starting above the band-shaped metal plates, there is a problem in that holes are frequently formed in the band-shaped metal plates at the time of arc start.

Furthermore, when there is a large amount of heat input due to welding, there is a problem that the joint is adversely affected and the joint strength is reduced.

The present invention was made in view of these circumstances, and
The purpose of the present invention is to propose a method for joining strip-shaped metal plates made of alloy that does not create holes at the start of welding and is less likely to reduce strength due to welding heat when welding together strip-shaped metal plates.

[Means for solving problems]

In order to achieve the above object, the present invention provides a method for welding the ends of band-shaped metal plates to each other by setting the welding speed of TIG welding, particularly high-frequency pulsed arc welding, to 5 m/min or more to increase the plate thickness The method is characterized in that band-shaped metal plates made of Δβ alloy having a diameter of 1 mm to 3.5 mm are welded together and the welded joint is rolled.

[Effect]

According to the present invention, plate thickness Q
, l +++n+~0.5mm Al alloy band metal plates are welded together, so the effect of heat on the band metal plates during welding is minimized, and the band metal plates are sufficiently welded together. Furthermore, welding time can be shortened without using multiple welding torches. Furthermore, since a single welding torch is used and the arc is started outside the strip metal plate, it is possible to prevent holes from forming.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the method for joining band-shaped metal plates according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is an explanatory diagram of a method for joining band-shaped metal plates according to the present invention. As shown in FIG. 1, a band-shaped metal plate 10 made of an Al alloy is unwound from a roll 12, rolled onto a pass roller 14, and conveyed to a joining device 16. The pre-cutting device 18 of the joining device 16 is composed of two sets of cutter blades 20,20. The tip end 10A of the band-shaped metal plate 10 is cut by the bricutting device 18, and the rear end 2 of the band-shaped metal plate 22 made of Al alloy is cut.
It is formed so that it can be accurately matched or slightly overlapped with 2A.

A welding device 24 is provided downstream of the pre-cutting device 18, and the welding device 24 includes a clamp 26, 28 and a welding torch 3.
It consists of 0. A strip metal plate 10 is attached to the clamp 26.
The front end 110A of the band-shaped metal plate 22 is held in the clamp 28, and the rear end 22A of the band-shaped metal plate 22 is held in the clamp 28. Therefore, the tip 11
As shown in FIG. 2, the 0A and the rear end portion 22A are abutted against each other, and the abutted portion is welded by high-frequency pulse arc welding. That is, the welding torch 30 moves in the direction from the Δ position of this abutting portion to the B position (in the direction of arrow C) shown in FIG.
The end portions 10A and 22A of the band-shaped metal plates are welded.

In the case of this embodiment, the welding torch 30 moves at a speed of 6 m/min along the butt of the band-shaped metal plates, and the welding current has enough heat to melt the tip 10A and the rear end 22A. It is set up so that it can be supplied.

In this way, when welding the butt parts using high-frequency pulse arc welding, the arc is started at a location away from the strip metal plate using a single welding torch 30, so it is difficult to make a hole when the welding torch 30 starts the arc. 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 loss due to welding, and the welding cycle time can be reduced without using multiple welding torches. I can do it.

FIG. 3 is a front view showing a method of welding and joining the joints of the strip metal plates 10.22 using a single welding torch 30. The welding torch 30 performs an arc start at position 44, and then moves to the right (in the direction of the arrow) in Fig. 3 at a speed of 5 m/
It takes more than a minute to move and weld the joint.

A rolling device 32 is provided downstream of the welding device 24, and the rolling rollers 34 of the rolling device 32 are arranged at the end portions 10A and 2 of the strip metal plate.
Rolling of the welded joints between 2A is carried out. By such rolling treatment, the step formed in the welded joint is pressed and compressed. This rolling treatment increases the bonding strength. This is because the tensile strength reduced by welding is recovered by work hardening through rolling treatment, and at the same time, the material is processed into a shape that is less likely to cause stress concentration.

In the embodiment described above, the band-shaped metal plate 10 and the band-shaped metal plate 22 are butted against each other, but the present invention is not limited to this, and they may be slightly overlapped. In addition, when the strip metal plate IO and the strip metal plate 22 are bonded together in a minute overlap, a rolling process is particularly required.

Next, a comparative test of a joint joined by the method for joining band-shaped metal plates according to the present invention (welding speed of 5 m/min or more) and a joint joined at a welding speed of 5 m/min or less will be explained.

Test samples LO, L, No. 2, and Nα3 were made by combining an AA gold alloy strip metal plate with a thickness of 0° 24 mm and a width of 840 mm, and an Al alloy strip metal plate with a thickness of 0.10 s and a width of 840 mm. Welded them in a superimposed state.

Sample Nα1 is a strip metal plate welded at a welding speed of 6 m/min, Sample Nα2 is a strip metal plate welded at a welding speed of 2 m/min, and Sample Jα3 is a strip metal plate welded at a welding speed of 1 m/min. . Further, the welding current was increased in proportion to the welding speed so as to keep the width of the welded part constant. In addition, the welded part after welding was rolled under the same conditions.

Using these samples Nαl, Nα2 and Nα3, a rubber roll (φ600) was rolled while applying a tension of 235 kg.
2, 22 rubber rolls (φ200), and 2 rubber rolls (φ180), and the number of rotations until cutting was investigated. The results of this pass roller passage test are shown in Table 1.

Table 1 As is clear from Table 1, sample Nα1 produced by the method of joining strip metal plates according to the present invention has a welding speed of 5 m/
It can be seen that the passability of the bus roller is significantly improved compared to samples Nα2 and NcL3, which were welded in less than 10 minutes.

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

Test samples Na 4 and k 5 were made by welding two Al alloy band-shaped metal plates with a thickness of 0.10 mm and a width of 1030 mm, stacked one on top of the other.

Sample Nα4 is a band-shaped metal plate that was joined at a welding speed of 6 m/min using a single welding torch with an arc start outside the band-shaped metal plate. For sample Nα5, three welding torches were used, one of the three torches started the arc on the outside of the metal strip, and two torches started the arc on the inside of the metal strip, and the welding speed was 2 m/2.
It is a band-shaped metal plate joined in minutes.

The welding current was increased proportionally to the welding speed to keep the weld width constant.

As is clear from Table 2 regarding the test results of these samples Nα4 and Nα5, sample Nα4 produced by the method for joining strip metal plates according to the present invention is different from sample Nα4 produced using three welding torches at a welding speed of 2 m/min. .

Compared with No. 5, it can be seen that even if the welding time is the same, it is possible to join without forming a hole in the welded part.

Although high frequency pulsed arc welding was explained in the above embodiment, similar effects can be obtained with other TIG welding.

[Effects of the Invention] As explained above, according to the method for joining band-shaped metal plates according to the present invention, the welding speed of TIG welding, particularly high-frequency pulsed arc welding, is set to 5 m/min or more, so that the plate thickness can be reduced to 0.10 mm.
It is possible to sufficiently weld and join band-shaped metal plates made of β-alloy of ~0.50 mm to each other, and to minimize the influence of heat on the band-shaped metal plates during welding. Therefore, since the recrystallized portion of the belt-shaped metal plate after welding can be made small, it is possible to prevent the belt-shaped metal plate from breaking during circulation.

Note that the welding cycle time can be reduced without using multiple welding torches. Furthermore, by using a single welding torch, it is possible to prevent the occurrence of holes.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a method for joining band-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 joining method according to the present invention, Fig. 3 is a front view showing the band-shaped metal plate joining method according to the present invention, and Fig. 4 ( FIG. 5 is a front view showing a method for welding and joining belt-shaped metal plates using three welding torches. 10.22... Band-shaped metal plate, 16... Joining device, 18... Bricutting device, 24... Welding device, 3°... Welding torch.

Claims (1)

[Claims] (1) In the method of welding the ends of band-shaped metal plates together, the welding speed of TIG welding, especially high-frequency pulsed arc welding, is set to 5 m/min or more to join the Al plate with a thickness of 0.1 mm to 0.5 mm. A method for joining metal strips made of an alloy by welding together and rolling the welded joint.