JPH0259175A - Method for joining beltlike metal plates - Google Patents

Abstract

PURPOSE:To improve strength of a joined part of beltlike metal plates and to prevent the joined part thereof from rupturing by increasing welding output of the central parts of the beltlike metal plates and rolling the welded and joined part at the time of welding and joining the ends of the beltlike metal plates to each other. CONSTITUTION:The beltlike metal plate 10 is rewound and conveyed to a joining device 16 and cut by a pre-cutting device 18 and arranged so as to be able to be abutted accurately or superposed slightly on the rear end 22A of the metal plate 22. The tip 10A and the rear end 22A are then welded together by a welding torch 30 of welding equipment 24. In this case, when a welding current between butt parts A-B and C-D and a welding current between butt parts B-C are denoted by E1 and E2 respectively, E2 is made higher than E1. By this method, welding of the central parts is performed satisfactorily by making the welding current E2 of the central parts of the metal plates higher than the welding current E1 of both ends. In addition, joining strength is further increased by rolling the joined part by a rolling roller 34 of a rolling device 32.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for joining strip-shaped metal plates, and particularly to a joining method for joining end portions of flexible strip-shaped 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 band-shaped metal plates as shown in FIG. 4(a), there is a step at the joining part, so it is not possible to make smooth contact with a pass roller or the like. Further, in the photosensitive layer coating process in the manufacture of lithographic printing plates, the coating device must be evacuated to prevent damage when the joint portion of the band-shaped metal plate passes through. Further, if the coating device is not retracted, the bonding surface 73 will have a negative effect on the coating state and cause 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 bus roller, etc., which weakens the strength and makes it easy to cut. There is a point. Furthermore, such a bonded band-shaped metal plate receives bending stress when passing through the bus roller, but
This bending stress makes it easy for the joint to break. This phenomenon is particularly noticeable when the belt-like plates are thin, such as 0.1 mm to 0.2fflI11, or when there is a large difference in thickness between the two joined belt-like plates.

In order to solve these problems, a joining method has been disclosed in which band-shaped metal plates are welded together and the welded joint is rolled to eliminate the level difference.

[Problem that the invention seeks to solve]

However, when band-shaped metal plates are welded using such a conventional welding method, good welding is possible because there is no place for thermal energy to escape at both ends of the band-shaped metal plate, but at the center, thermal energy is absorbed at both ends. Since it is easily transmitted to the parts, poor welding occurs frequently.

Therefore, since the strength of the central part of the welded joint is weak, there is a problem that the welded joint will break if it is passed through many bus rollers etc. while being subjected to large tension.

The present invention has been made in view of the above circumstances, and has the purpose of proposing a method for joining belt-shaped metal plates that can improve the strength of the joint of the belt-shaped metal plates and prevent the joint from breaking. There is.

[Means for solving problems]

In order to achieve the above object, the present invention provides a method for joining the ends of band-shaped metal plates to each other by setting the welding output at the center of the band-shaped metal plates to be welded to be larger than the welding output at both ends. It is characterized by welding strip metal plates together and rolling the welded joint.

[Effect]

According to the present invention, the welding power at the center of the strip metal plate is set higher than the welding output at both ends, and defective melting at the center can be prevented. It is possible to improve the strength of the joint.

〔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.
It is rewound from the bus roller 14 and connected to the joining device 16.
transported to. The bricutting device 18 of the joining device 16 has two
It consists of a set of cutter blades 20.20. Band-shaped metal plate 1
The leading end portion 10A of the metal strip 22 is cut by the bricutting device 18, and is formed so that it can be accurately matched or slightly overlapped with the rear end portion 22A of the band-shaped metal plate 22.

A welding device 24 is provided downstream of the bricutting device 18, and the welding device 24 includes a clamp 26, 28 and a welding torch 3.
It is composed of Q. A strip metal plate 10 is attached to the clamp 26.
The front end 10A of the band-shaped metal plate 22 is held by the clamp 28, and the rear end 22A of the band-shaped metal plate 22 is held by the clamp 28. Therefore, the tip 1
0A and rear end portion 22A are butted against each other, as shown in FIG. The welding torch 30 moves from position A to position D of this abutting portion shown in FIG. 2 to weld the end portions 10A and 22A of the band-shaped metal plates.

In this case, as shown in FIG. 3, the welding current between the butt portion A and B (the left end of the strip metal plate in FIG. 2) is set to El,
E2 is the welding current between the butt portion B and C (the center of the strip metal plate in Figure 2), and the welding current between the butt portion C and D (the right end of the strip metal plate in Figure 2) is E2. Set to El. As described above, since the welding current E2 is larger than the welding current E1, sufficient melting occurs between the abutting portions C and D.

Welding methods include TIG arc welding, MIG arc welding, gas welding, and laser welding such as CO□, YAG, etc., which are selected and used depending on the type of metal constituting the band-shaped metal plate.

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 suppressed 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 addition, when the strip-shaped metal plate 10 and the strip-shaped metal plate 22 are bonded together with minimal overlap, a rolling process is particularly required.

Next, a comparison test was conducted between a joint joined by the method for joining band-shaped metal plates according to the present invention and a conventional joint.

Test sample No. 1 and sample Nα2 are made of an aluminum plate with a thickness of 0.40 mm and a width of 840 mm, and an aluminum plate with a thickness of 0.2 mm.
It was manufactured using an aluminum plate with a width of 4 mm and a width of 840 mm.

Sample Nα1 is a band-shaped metal plate joining method according to the present invention,
That is, the welding current is 45A for the distance from the welding start point to 200mm (A-8 in Figure 2), and from there the welding current is 200mm to the welding end point.
The welding current is 60A1 for the period up to 00mm (between B and C in Figure 2), and the welding current is 45A for the 200mm from there to the welding end point (between C and D in Figure 2). Then, the welded part was rolled. Also, sample! J
No. 02 was manufactured using a conventional joining method for band-shaped metal plates, that is, aluminum plates were welded together using a constant welding current of 45 A from the start of welding to the end of welding, and the welded portion was rolled.

Using these samples No. 1 and No. 2, a rubber roll (φ600) was loaded with a tension of 355 kg.
Table 1 shows the results of a bus roller passage test in which the samples were rotated between 2 rubber rolls (φ200) and 2 rubber rolls (φ180), and the number of rotations until cutting was determined.

Table 1 As is clear from Table 1, sample Nα1 produced by the band-shaped metal plate welding method according to the present invention has significantly improved passability through the bus roller compared to sample Nα2, which was conventionally welded with a constant current. I understand that.

〔Effect of the invention〕

As explained above, according to the method for joining strip-shaped metal plates according to the present invention, the welding output at the center of the strip-shaped metal plate is set higher than the welding output at both ends, so that it is possible to prevent defective melting at the center. I can do it. Therefore, the strength of the welded joint at the center is improved. As a result, breakage of the welded joint can be prevented.

[Brief explanation of the drawing]

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, and Fig. 3 is an explanation showing changes in welding current in the band-shaped metal plate joining method according to the present invention. 4A and 4B are perspective views of a conventional method for joining band-shaped metal plates. 10.22... Band-shaped metal plate, 16... Joining device,
18... Pre-cut device, 24... Welding device, 3
0...Welding torch.

Claims (1)

[Claims] (1) In the method of welding the ends of band-shaped metal plates to each other, the welding power at the center of the band-shaped metal plates to be welded is set higher than the welding output at both ends, and the band-shaped metal plates are welded together. , a method for joining strip-shaped metal plates, characterized by rolling the welded joint.