JPH02200380A - Method for joining belt-like metallic sheets - Google Patents

Abstract

PURPOSE:To weld and join the belt-like metallic sheets in a state with an arc current stabilized at a set value at the time of subjecting the belt-like metallic sheets to TIG welding by generating an arc at a distance from the belt-like metallic sheets and performing welding on ends of the metallic sheets after the lapse of more than specified seconds from the generating time of the arc to roll a welded and joined part. CONSTITUTION:After the lapse of >=0.6 second from generating of the arc, the belt-like metallic sheets are welded and joined together. By this method, welding is performed after the arc is stabilized at the set value and welding is performed after the temperature of an electrode is stabilized. A belt-like metallic sheet 10 of an Al alloy is conveyed to a joining device 16 and the tip 10A is cut by a precutting device 18 and abutted exactly on the rear end 22A or superposed thereon slightly. Both ends are abutted on each other by clamps 26 and 28 of welding equipment 24 and joined together by high-frequency pulse arc welding. A welding torch moves from the position A to the position B and joins the ends 10A and 22A together and then, the welded and joined part is rolled by a rolling rolls 34 of a rolling mill equipment 32.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for joining band-shaped metal plates, and particularly relates to a joining method for joining the ends of flexible A1 alloy band-shaped metal plates. .

[Conventional technology]

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 Figure 4(b),
The end portions of the band-shaped metal plates 70 and 72 are abutted against each other, and the abutment joint portion 75 is joined with one-sided adhesive tape 76, 76 (FIG. 2 of JP-A-59-24526).

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 that it is not possible to make smooth contact with a bus roller or the like. In addition, in the photosensitive layer coating process in the production of lithographic intermediate printing plates, the coating device must be retracted to prevent damage when the joint portion of the band-shaped metal plate passes through. 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 bonding 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. Furthermore, such a bonded strip-shaped metal plate is subjected to bending stress when passing through the bus roller, but
This bending stress tends to cause breakage at the joint.Especially in the case of thin strip plates such as 0.1 to 0.2 mm, or when there is a large difference in the thickness of the two strip plates to be joined. occurs significantly.

In order to solve these problems, we have developed a joining method that welds strip metal plates together and rolls the welded joint to eliminate the level difference, and also to prevent stress concentration from occurring in the heat-affected zone created by welding at the joint. A joining method that performs processing is disclosed.

Automatic arc welding is generally applied to this method, and fifth
As shown in the figure, the electrode 86 and the strip-shaped metal plate 10.22 are often ignited (arc is generated) in a non-contact state. That is,
A mixed gas such as HClAr is introduced into the welding torch 84,
This mixed gas is passed through the opening 85A of the torch cup 85.
While blowing out downward as a shielding gas, the electrode 86 and
An arc is generated by the arc voltage between the back par 87 and the back par 87. Next, the welding torch 84 is moved along the part of the band-shaped metal plate 10.22 to be joined (in the direction of the arrow in FIG. 5) to weld and join the band-shaped metal plate 1O122.

[Problem that the invention aims to solve]

However, since there is a time lag of 0.1 seconds to several seconds from the time the arc changes to a stable arc, if the metal strip 10.22 is welded immediately after the arc occurs, the arc will be larger or smaller than the set value. The welding of metal strips will be performed using electric current. That is, when the belt-shaped metal plate is thin, there is a problem that immediately after the arc occurs, the arc is generated with an arc current larger than a set value, and the welding start end is fused. On the other hand, when the belt-shaped metal plate is thick, an arc is generated with an arc current smaller than the set value, so there is a problem that insufficient melting or unmelted parts occur at the welding start end.

Furthermore, immediately after the arc occurs, the temperature of the electrode 86 is not stable, and the transfer of electrons tends to be unstable, so the arc becomes unstable, especially when welding a thin metal strip. This tends to cause bead non-uniformity in areas, resulting in poor melting, formation of holes, and poor appearance (lack of photoselectivity).
There is a problem in that

In addition, the above-mentioned fusing, defective melting, unmelting, holes, etc. not only have a significant negative effect on the strength of the welded joint, but also
When a post-process includes a surface treatment step or a coating step, there is a problem that during these steps, the rolls get dirty due to the backing of the chemical solution, and that the rolls are easily damaged at the joint ends.

The present invention has been made in view of the above circumstances, and proposes a method for joining belt-shaped metal plates that does not cause fusing, insufficient melting, unmelting, holes, poor appearance, etc. at the welded joints between the belt-shaped metal plates. The purpose is to

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention has a method of welding the ends of band-shaped metal plates to each other by TIG welding, in which an arc is generated at a distance from the band-shaped metal plates. , 0 from the time of arc occurrence.
The method is characterized in that the ends of the band-shaped metal plates are welded together after 6 seconds or more have elapsed, and the welded joint is rolled.

[Effect]

According to the present invention, the arc that welds and joins the band-shaped metal plates to each other is generated at a distance from the band-shaped metal plates, and after the arc is generated,
After more than a second has elapsed, the ends of the band-shaped metal plates are welded together. Therefore, welding can be performed after the arc has settled down to a set value, and furthermore, welding can be performed after the temperature of the electrode has stabilized.

〔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, the Aj gold alloy strip metal plate 10 is unwound from the roll 12, transferred to the bus roller 14, and conveyed to the joint W16.

The pre-cut device 18 of the joining device 16 has two sets of cutter blades 2.
It is composed of 0.20. The tip end 10A of the band-shaped metal plate 10 is cut by a pre-cutting device 118, and A
It is formed so that it can accurately butt against or be slightly overlapped with the rear end 122A of the band-shaped metal plate 22 of 1 alloy.

A welding device 24 is provided downstream of the pre-cutting device 18, and the welding device [1f24 is composed of a clamp 26, 28 and a welding torch 30. The clamp 26 holds the tip end 10A of the band-shaped metal plate 10, and the clamp 28 holds the rear end 22A of the band-shaped metal plate 22. Therefore,
As shown in FIG. 2, the front end portion 10A and the rear end IF 622A are abutted against each other, and the abutted portion is welded by high frequency pulse arc welding. That is, the welding torch 30
The belt-shaped metal plate end portions 10A and 22A are joined and welded by moving from position A to position B (direction of arrow C) of the abutting portion shown in the figure.

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

FIG. 3 is an operation flow sheet of the welding apparatus 1f24 of the method for joining band-shaped metal plates according to the present invention.

The operation of the welding device 240 will be explained below with reference to FIG. First, as shown in FIG. 3(a), when the welding start signal is set to the ON state, voltage is applied to the arc generating circuit and the welding starts as shown in FIG. 3(C). As shown in FIG. 3(d), an arc is generated. Simultaneously with the occurrence of the arc, as shown in FIG. 3(e), a torch holding timer is activated to hold the welding torch 30 in a predetermined position for t2 seconds.

After t2 seconds, the torch holding timer is canceled and the third rg
As shown in (f) of J, the welding torch 30 moves to weld and join the tip 10A of the band-shaped metal plate 10 and the tip 22A of the band-shaped metal plate 22. As shown in FIG. 3 (g), the arc current of the welding torch 30 is higher than the set value [1] for about 1 second after the arc generation circuit is turned on.
2], and thereafter remains stable at the set value [l]. Therefore, after the arc is generated, the welding torch 30 is held for t2 seconds and then the welding torch 30 is moved to weld and join the band-shaped metal plates, so that the welding can be performed after the arc has settled down to the set value [1]. After the welding is completed, the welding completion signal is turned on, as shown in Figure 3 (b).
state, and arc generation stops.

Note that t is 0.2 to 1. O seconds t2 is 0. It is desirable that the time be 6 seconds or more.

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.
2. Perform rolling of the welded joints. 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 1O and the band-shaped metal plate 22 are butted against each other, but the invention is not limited to this, and they may be slightly overlapped. Note that in the case where the strip metal plate 10 and the strip metal plate 22 are bonded together in a minute overlap, a rolling process is particularly required.

Below, the joints welded using the method for joining strip-shaped metal plates according to the present invention (starting welding after 0.6 seconds or more has elapsed from the time of arc occurrence) and the joints welded after 5 seconds from the time of arc occurrence. A comparison test with a welded joint after joining will be explained.

Samples for testing 1 to 5 and sample Nα11
~Nα40 is the plate thickness dimension 0. IO order convergence width dimension 915 rule AI
! This is made by welding alloy strip metal plates stacked one on top of the other.

Samples 6 to Nα10 are made by welding belt-shaped metal plates of A1 alloy with a thickness of 0.50 mm and a width of 1470 mm in a stacked state.

Samples Ma41 to Ma43 are A1 alloy strip metal plates with a thickness of 0.241 m and a width of 840 mm and a plate thickness of 0.10 g.
A strip metal plate of 1 alloy with a width dimension of 840n is 1ffi11
Welded in an overlapping state, and further plate thickness 0.10+
The joint portion is rolled so that the difference in thickness between the heat affected zone generated in the AS band-shaped metal plate and the adjacent molten zone/AR base material is 30%.

In addition, samples Na6 to Sho43 were welded at a welding speed of 611 I/min, the welding current for samples Nα1 to Nα5, Nα11 to No40 was 16A, the welding current for samples Na6 to Sho10 was 105A, and the welding current for samples Na6 to Sho10 was 105A. Jo, 41-N1143
The welding current was 26A. However, in both cases, the current at the time of arc occurrence was 3QA.

Note that samples Nα41 to Nα43 were rolled under the same conditions.

In comparative test 1, the times from arc generation to welding start for samples Nα1 to Nα5 were set to 1 second, 0°7 seconds, and 0.7 seconds, respectively.
6 seconds, 0.5 seconds, 0 seconds, samples 11 & 16~No.
, 10 The times from arc generation to the start of welding were set to 1 second, 0.6 seconds, 0.5 seconds, and 0.4.0 seconds, respectively, and comparisons were made regarding fusing and fusing failure at the welding start end. The results are shown in Table 1.

Table 1 Samples Nα21 to Nα30 and Samples N (131 to
The time from the arc generation to the start of welding for Nα40 is 1. 0 seconds, 0.6 seconds, 0.5 seconds, poor appearance (
The rate of occurrence of soot-like stains and loss of gloss) was compared. The results are shown in Table 2.

In Table 2 Comparative Test 2, the sample number was 11 to 20, and in Comparative Test 3, the sample was 41 to 20! Using a rubber roll (φ600
), 22 rubber rolls (φ200), and two rubber rolls (φ180), and the number of rotations until cutting was investigated.

The results of this pass roller passage test are shown in Table 3.

As is clear from Table 3 and Table 1, samples Nα1.2.3.6.
7, no defects outside the allowable range occur.

Also, as is clear from Table 2, if the time from arc generation to the start of welding is increased, it is possible to join thin strip metal plates such as 0.1 fin - 0.1 ms, which are prone to soot-like contamination. Dirt generation rate is reduced.

Furthermore, as is clear from Table 3, in the sample where the time from arc generation to the start of welding is 1 second, the fusion length is ll.
It is about 111, which is smaller than other samples, and the handling strength until cracking occurs is also high.

Although high-frequency pulsed arc welding has been described in the above embodiment, the present invention is not limited to this, and similar effects can be obtained with other TIG welding methods.

〔Effect of the invention〕

As explained above, according to the method for joining band-shaped metal plates according to the present invention, an arc is generated at a distance from the band-shaped metal plate,
Since the ends of the band-shaped metal plates are welded to each other after 0.6 seconds or more have elapsed from the time of arc generation, welding can be performed while the arc current is stabilized at the set value.

Therefore, it is possible to prevent fusing, poor fusion, unwelding, holes, poor appearance, etc. of the welded joint, improve the strength of the welded joint, and further improve the surface of the welded joint after welding. It is possible to prevent stains and scratches from occurring on the rolls during the treatment process and coating process.

[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 operation flow sheet of a welding device used in the band-shaped metal plate joining method according to the present invention. and a diagram of the relationship between arc current and time, Figure 4 (a)
and (b) is a perspective view of a conventional method for joining band-shaped metal plates, and FIG. 5 is a schematic explanatory diagram showing the positional relationship between a welding electrode of a conventional welding device and a band-shaped metal plate. 10.22... Band-shaped metal plate, tip portion, 16... Joining device, device, 24... Welding device, one piece, 86... Welding electrode. 10A, 22A... 18... Pre-cut 30.84... Welding Fig. 1

Claims (1)

[Claims] (1) In the method of welding the ends of band-shaped metal plates together by TIG welding, an arc is generated at a distance from the band-shaped metal plate, and after 0.6 seconds or more has elapsed from the time of arc generation, the ends of the band-shaped metal plate are A method for joining band-shaped metal plates, which is characterized by welding the two together and rolling the welded joint.