JP2651368B2 - Thin plate welding method and backing plate used in this method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thin plate welding method and a metal plate used for the method.

[0002]

2. Description of the Related Art Conventionally, for thin plate welding, for example,
The thing described in Japanese Patent Publication No. 3-2584 is known. This is done by placing the work to be butt-welded on the receiving jig, keeping the back bar provided inside the receiving jig in close contact with the lower surface of the welded part of the work, and suppressing the upper surface of the work with the upper jig. While the back bar is cooled with cooling water, the butted workpieces are welded from above. Although there is no detailed description of a portion of the back bar that is in close contact with the thin plate, a groove for smoothing or shaping the back bead is usually processed.

[0003]

However, in the conventional welding described above, it is difficult to make the back bar and the work closely contact with each other over the entire length of the welding line, and therefore, a close portion and a non-close portion are generated. . And if welding is performed under the same welding conditions to the close part and the non-close part, the weld that works well for the close part will not work well for the part that is not close closely, Problems such as perforation may occur. In addition, when welding a thin plate with a plated surface, the smoothed back bar and the workpiece are in close contact with each other, and the gas of the plating agent generated on the back of the molten pool during welding blows the molten pool. In some cases, welding becomes impossible, and there is a problem that if gas is mixed into the molten pool, defects such as blowholes are likely to occur during welding.

[0004] In view of the above, the present invention has been made to provide a method for welding a thin plate capable of stably obtaining complete melting, which is a condition for completely performing welding, and a metal plate used in the method. Things.

[0005]

In order to achieve the above object, the present invention provides a thin plate including a portion in which a thin plate is abutted, and a predetermined portion of one surface is formed with a rough surface and a roughened side of the backing is abutted. The thin plate and the backing plate are brought into point contact with each other, and a predetermined position of the thin plate on which the backing plate is not in close contact is pressed against the backing plate with a restraining jig, and the butted portion of the thin plate is pressed back. A method for welding a thin plate in which the thin plate and the backing plate are brought into surface contact with each other to cool the molten metal by welding, and then the backing plate and the restraining jig are separated from the thin plate. A plurality of grooves are formed at predetermined locations, and the depth of these grooves is 0.1 to 2.0 m / m.

[0006]

[Function] A thin plate is joined at a portion to be welded. And
The roughened side of the backing plate, which has a predetermined surface on one side, is brought into close contact with the thin plate including the butted portion, and the side of the thin plate where the backing plate is not in close contact is pressed against the backing plate side with a restraining jig. I do. Then, the butted portion of the thin plate is welded, and thereafter, the metal plate and the restraining jig are separated from the thin plate, thereby welding the thin plate.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a thin plate welding method according to the present invention; FIG.

Reference numeral 1 denotes a thin plate to be welded.
m / m or less steel plate, plated steel plate, aluminum plate, etc. are applied. Then, the portions to be welded are butted and welded.

Reference numeral 2 denotes a backing, which is made of a material having good thermal conductivity, such as copper and aluminum. A plurality of grooves 3 (FIGS. 1 to 3 are examples of a V-shaped groove) and (FIG. 4 is an example of a square-shaped groove) are formed in the backing plate 2 as shown in FIGS. The depth (h) of these grooves 3 is set to 0.1 to 2.0 m / m, and is formed by scribing, knurling, milling, cutter, end milling, or the like. The metal plate 2 is fixed on a base (not shown) and is welded to the lower surface of the thin plate 1 including the welded portion 4.

Reference numeral 5 denotes a restraining jig which is formed on both sides of the welded portion 4 of the thin plate 1 on the side opposite to the backing metal, for example, by forming an interval of 6 m / m and pressing the thin plate 1 by a hydraulic press (not shown). It has become.

Since the welding of the thin plate 1 is configured as described above, when the welding is started by bringing the welding wire 6 close to the welding portion 4 of the thin plate 1, as shown in FIG. The contact plate 2 is in point contact with the contact plate 2, and the thin plate 1 and the contact plate 2
Since the gap 7 exists between them, the gap 7 limits the melting width of the thin plate 1 to form a weld bead having a stable width. Then, as the melting proceeds, as shown in FIG. 2, the melted thin plate 1 comes into surface contact with the groove 3 of the contact metal 2 by the arc force, and the thin plate 1 is rapidly cooled. Therefore, the molten pool due to melting can be kept small,
Restraint force is generated against solidification shrinkage and heat shrinkage of the molten pool,
Deformation of the welded portion 4 can be suppressed, and burnout of the bead and poor appearance are reduced. In addition, when welding a thin plate (for example, a plated steel plate) that generates gas by welding heat, the gas near the welding portion 4 of the thin plate 1 is in point contact with the abutment 2 until immediately before melting. From the gas to the surroundings, and no gas is mixed into the molten pool to cause welding defects such as blow holes. When the welding is completed, the contact metal 2 and the restraining jig 5 are separated from the thin plate 1.

The method of welding the thin plate 1 according to the present invention is based on T
The present invention can be applied to welding methods such as IG, CO ₂ , MAG, MIG, laser, and plasma.

Although the pad 2 is naturally cooled, for example, forced water cooling may be performed to adjust the water temperature, but the invention is not limited to this.

[0014]

As described above, in the method for welding a thin plate according to the present invention, since the thin plate and the backing plate are initially brought into point contact with each other over the entire length of the welding line, there is a close contact between the thin plate and the backing plate. The part and the part that is not in close contact do not occur at the same time, and the contact state is constant. Therefore, first, a metal plate having a rough surface is in point contact with the thin plate including the butted portion to be welded, and the melting width of the thin plate is limited by the gap caused by the point contact, so that the thin plate is completely melted and stable welding is performed. Beads are formed. Then, as welding progresses, the thin plate and the abutment come into surface contact with each other, so that the cooling area is widened and the cooling of the thin plate is promoted, and the molten pool is formed small by cooling the molten metal. Can be suppressed, and bead burnout and poor appearance can be reduced, so that complete melting can always be obtained stably under the same welding conditions. Further, since gas is released from the rough groove even for a kind of material that generates gas by welding, welding can be performed without introducing gas into the molten pool and without generating defects such as blowholes. In addition, these can be achieved only by forming a plurality of grooves on the surface of the backing plate and processing the grooves to a depth of 0.1 to 2.0 m / m. The effect is that complete welding can be performed.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a method of welding a thin plate.

FIG. 2 is a schematic view showing a method of welding a thin plate.

FIG. 3 is a detailed view of a pad.

FIG. 4 is a detailed view of a pad.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 thin plate 2 backing plate 3 groove 4 welded part 5 restraining jig 6 welding wire 7 gap

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kazutoshi Hasegawa 3-1-1, Higashikawasaki-cho, Chuo-ku, Kobe-shi, Hyogo Kawasaki Heavy Industries, Ltd. Kobe Plant (56) References JP-A-62-107898 (JP, A) JP-A-53-76940 (JP, A) JP-A-52-84515 (JP, U) JP-A-48-38495 (JP, Y2)

Claims (2)

(57) [Claims] A thin plate is abutted, a predetermined portion of one surface is roughened, and the rough surface side of the abutment is brought into close contact with the thin plate including the abutted portion to make point contact between the thin plate and the abutment. a predetermined position of the sheet on the side where the gold is not closely pressed against the straps side restraint jig, the butted portion of the thin plate by welding from the opposite straps side and the thin plate and straps by surface contact A method for welding a thin plate, wherein a metal plate and a restraining jig are separated from the thin plate after cooling the molten metal by welding. 2. A butt thin plate, in line have welding the welding is brought into close contact with straps in a thin plate containing this butted portion
That the straps using molten metal to the welding method of the thin plate Ru allowed to cool, the straps forms a plurality of grooves at predetermined locations on one surface, the depth of these grooves is 0.1~2.0m / m A contact metal used for a method of welding a thin plate, characterized in that it has a certain characteristic.