JPS6233083A - Abutting method for metal strip at laser welding time - Google Patents

Abstract

PURPOSE:To well abut a butt part by abutting by sucking the tip face of the strip at succeeding side to the rear end face of the metal strip at the preceding side magnetized by a magnet as well as clamping with the upper and lower clamp pieces. CONSTITUTION:The preceding sheet 1 is held by the upper and lower clamp pieces 3, 2 and kept in the magnetized state by installing a magnet 6 on the lower clamp piece 2. The succeeding sheet 1' is advanced in the state of pinching it by the upper and lower clamp pieces 3', 2'. The cut face 1a of the preceding sheet 1 is magnetized and the preceding sheet 1 and succeeding sheet 1' can be abutted perfectly reasonably with the cut face 1a' of the succeeding sheet 1' being sucked thereto. The abutting can be performed without causing a gap at the butt part and yet with uniform force.

Description

Detailed Description of the Invention <Object of the Invention> Industrial Field of Application The present invention relates to a method of butting metal strips during laser welding, and more specifically, the present invention relates to a method of butting metal strips during laser welding, and more specifically, a metal strip having a thickness of 0.5 to 0.15 cm and a width of 50 mm.
The present invention relates to a method for butting metal strips that can precisely butt the cut surfaces of opposing ends of both extremely thin and wide metal strips such as 0 to 1500++ m without matching each other.

Conventional technology In general, the ends of steel strips (hereinafter simply referred to as strips) such as hot-rolled steel plates are joined together and made continuous, and a predetermined process is performed to manufacture various product materials. Among these materials, for example, silicon steel strips and the like are sold on the market as continuous products with their ends joined together. In either case, this connection is made between the rear end of the leading strip (hereinafter referred to as the leading plate) and the tip of the invading strip (hereinafter referred to as the leading plate), that is, both opposing ends. The welding process is carried out by cutting the material in advance, then butting these cut surfaces together to form a groove, and then running a welding torch along this butt groove to perform welding. This welding torch was normally used for TIG welding, MIG welding, etc., but recently silicon steel strips, whether oriented or non-oriented, are becoming thinner and wider. Along with this, laser welding torches are being used. In other words, when the beam diameter is reduced in laser welding, TIG
Compared to welding methods such as or MIG, the width of the weld bead can be made smaller with almost no heat-affected zone generated, and the surface of the weld bead can be made almost flat. Laser welding is suitable for silicon steel strips that are processed. However, compared to the precision bevel required for TIG welding and MIG welding, laser welding
A highly precise groove is required, and unless it is a highly precise groove, the above-mentioned advantage of being able to make the diameter of the hot wire extremely thin cannot be fully utilized. However, it is extremely difficult to form such a high-precision groove, and there is a need for a method that can reliably form this groove.

Generally, when butt welding metal strips, as shown in FIG. In this state, the leading plate 1 and the trailing plate 1' are brought together on the back par 4 and welded together by running a laser torch 50, or as shown in FIG. In contrast to the clamp-fixing method, a method is used in which the trailing plate 1' is brought together, butted and welded. However, when butting together like this, if the plates are thin, they will form a mountain shape as shown in Figure 5, and if the butt force is weakened, a gap will appear between the butt surfaces as shown in Figure 6. 6 is generated. In particular, diameter 0.1 to 0.2
When using an ultra-fine laser beam such as 1111+1φ, a good weld bead cannot be obtained with the groove as described above, partly because the allowable value of the butt gap between the objects to be welded is small.

Problems to be Solved by the Invention The present invention aims to solve the above-mentioned drawbacks. Specifically, in the conventional butting method, a butt gap is generated due to the butt force, and the butt surface is raised into a shape. The purpose is to solve the problem that it is extremely difficult to match accurately due to various reasons.

<Structure of the Invention> Means for solving the problem and its operation, that is, the method of the present invention is that, prior to laser welding, the rear end of the metal strip on the leading side is sandwiched between the upper and lower clamp pieces on the leading side. It is characterized in that it is clamped in a magnetically held state, and then the leading end surface of the trailing metal strip is attracted and abutted against the trailing end surface of the leading metal strip that is magnetized by the magnet. .

Therefore, the structure of this means and its operation will be specifically explained with reference to the drawings as follows.

First, FIGS. 1 and 2 are explanatory diagrams of each process when carrying out the method of the present invention.
Also, each end of the trailing plate 1' is cut. This cutting method can be performed by shear cutting as in the conventional example, or by abrasive cutting by moving a rotary abrasive cutting body such as a so-called disc cutter in the width direction of the plate.

Next, as shown in FIG. 1, after cutting, the leading plate 1 is held by the upper and lower clamp pieces 3.2, and in particular, the leading plate 1 is held by the magnetic force of the magnet 6 provided on the lower clamp piece 2, and the leading plate 1 is held by the upper and lower clamp pieces 3.2. Board 1
While magnetized by the magnet 6, the trailing plate 1' is moved forward while being sandwiched between the upper and lower clamp pieces 3', 2' on the trailing side. When moving forward in this way, as shown in Figure 2,
When the cut surface 1a' of the trailing plate 1' approaches the cut surface 1a of the leading plate 1, since the leading plate 1 is magnetized by the magnet 6, the cut surface 1a' of the trailing plate 1' is attracted. Completely and forcefully (butted against the cut surface 1a of the preceding plate 1).

Note that when forming this butt groove, if the cutting surface 1a of the leading plate 1 is made to match the running line of the welding torch 5, the groove line will match the welding torch running line, and the welding torch 5 will be Good and smooth welding can be achieved simply by running in the width direction of the plate.

<Effects of the Invention> As explained in detail above, the method of the present invention attracts and holds the leading metal strip with a magnet and clamps it in a magnetized state, and brings the trailing metal strip close to the leading metal strip to perform proper operation. Since the butts are butted together with a certain butting force, a highly accurate groove can be formed without any problem.Furthermore, if the cutting surface of the leading metal strip is aligned with the traveling line of the laser welding torch, laser welding can be performed without any problem.

In other words, in the conventional example, if the plate thickness is thin and wide,
For example, if the butt force is too large, the butt part will become mountain-like or uneven, and if it is weak, a gap will be created between the butt surfaces, and if welded at such butts, holes or bead defects will occur. do.

On the other hand, in the method of the present invention, in order to ensure that the abutting surfaces always abut with a constant force in the width direction, the leading metal strip is magnetized, the trailing metal strip is moved close to this point, and then the leading metal strip is moved close to the leading metal strip. By adhering it to the cut surface of the metal strip on the side, there is no gap and it can be butted together with even force.

When moving the metal strip on the trailing side in a clamped state, after moving it very close to the metal strip on the leading side (approximately 1 mm), simply release the clamp and the metal strips will butt together with a uniform force. After that, the trailing metal strip is clamped again and welding is performed.

[Brief explanation of drawings]

FIGS. 1 and 2 are explanatory diagrams of each step when carrying out the method of the present invention, and FIGS. 3, 4, 5, and 6 are explanatory diagrams of each of the butting methods according to the conventional example. be. Code 1... Leading plate 1'... Trailing plate 1a, Ia'... Each cut surface 2... Lower clamp piece 2' on the leading side. ...Lower clamp piece 3 on the trailing side...
Leading side upper clamp piece 3'... Trailing side upper clamp piece 4...
Back bar 5... Laser welding torch 6... Magnet @ Figure 1 + 4! 2 Figure 3 Figure 4

Claims (1)

[Claims] Prior to laser welding, the rear end of the metal strip on the leading side is clamped between the upper and lower clamp pieces on the leading side and held by magnetic force, and then the metal strip on the leading side is magnetized by this magnet. A method for butting metal strips during laser welding, characterized by sucking and butting the leading end surface of the metal strip on the trailing side against the rear end surface.