JPH0675798B2 - Butt welding method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a butt welding method for metal plates.

[Prior Art] As shown in FIG. 3, at least two metal plates 1 and 1 are butted, and the butted portion 2 is formed with a groove portion 3 having a fan-shaped tip as shown in the drawing. Moreover, the butt welding method in which the backing material 4 is applied to the back surface of the butt portion 2 and the metal plates 1, 1 are welded by gas welding or arc welding is widely used for various structures such as ships and structures.

A metal flat plate is used as the backing material 4.

It is also known to use the metal powder 7 filled in the container 6 as the backing material 4, as shown in FIG.

[Problems to be Solved by the Invention] A method of using a metal flat plate as the backing material 4 (called a flat plate method)
Has the following problems.

Weld defects are likely to occur at the seams of metal flat plates.

Also, a method is proposed in which the seam of the metal flat plate is welded in advance before the main welding of the metal plates 1 and 1, or a tapered piece is pushed into this seam. Welding stress increases, or the base material (metal plate 1) and backing material 4
There is a problem in that the adhesiveness with and becomes insufficient, and that it takes time to process the joint.

The method of using the metal powder 7 filled in the container 6 (referred to as the metal powder filling method) has the following problems.

It is difficult to uniformly fill the metal powder 7, and variations in the shape of the backside wave obtained by welding are likely to occur.

Further, since the metal powder 7 is filled in the container 6, the metal powder 7 will spill out of the container 6 when the container 6 is tilted.

Therefore, this method cannot be used when the metal plate 1 is tilted or the metal plate 1 is vertical.

Further, it is necessary to use the container 6, and when welding in a T shape, separate containers 6 and 6 are used by abutting, so that a welding defect is likely to occur at this abutting portion.

[Means for Solving the Problems] In order to achieve the above-mentioned object, in the present invention, at least two metal plates are butted against each other by forming a groove portion having a fan-shaped tip at the end edge portion, When applying a backing material to this butt part and welding a metal plate, the backing material is thickened with metal powder.
It is composed of a stick-shaped material (abbreviated as this member) wrapped with 10 to 100μ metal foil.

If the thickness of the metal foil is smaller than the above range, the metal foil is likely to be broken during work or handling, and the shape retention of this member is insufficient, and a gap is likely to be formed between the metal plate and the metal plate to be welded. Become.

When the thickness of the metal foil is larger than the above range, the plastic deformability of this member becomes insufficient, and it becomes difficult to form a dent described later,
It is difficult to obtain a uniform backwater.

This member has an appropriate plastic deformation characteristic, and can be held in close contact with the abutting portion of the base metal even when it is supported and welded at a position perpendicular to the metal plate (base metal) to be welded.

Further, when the base material is welded, this member is melted by the molten metal flowing out from the butted portion to form a recess, and the molten metal flows into the recessed portion to form a back wave. Further, since the present member can easily make constant the properties such as adhesion, it is possible to obtain a uniform backside wave of a constant shape.

Furthermore, when this member is used by abutting it in the longitudinal direction, the foil encapsulating the powder melts and disappears by welding,
Also at the seam of the members, the back wave is continuously formed, so that the occurrence of cracks is prevented. In other words, the abutting part is well-adapted and no gap is created in the abutting part, so even if this member is used by abutting, defects such as cracks may occur in the base material near the abutting part. The shape of the back wave is uniform in this part as well.

The metal powder used in this member does not leak during handling, work, sticking to the base material, or leaking from the abutting portion of the member.

In addition, although arc welding and gas welding can be preferably used as the welding method, these welding methods are not different from known methods, and thus detailed description thereof will be omitted.

[Examples] Next, the present invention will be specifically described with reference to Examples.

As shown in FIGS. 1 and 2, metal plates 1 and 1 are butted against each other to form a butted portion 2 and a groove portion 3 having a fan-shaped tip.

The stick-like material 9 in which the metal powder 7 is wrapped with the metal foil 8 is used as the backing material 4, and is applied to the butt portion 2 to perform welding.

The metal powder 7 and the metal foil 8 are preferably made of the same material as the base material.

This member can hold the metal plate (base material) to be welded in a vertical position and can hold the metal plate in close contact with the abutting portion of the metal plate even when welding.

The member can also be attached to the base material by spot welding.

As a welding method, arc welding, gas welding or the like can be used, but since the welding method is not different from the known method, detailed description thereof will be omitted.

Since this member is made of a material whose size in at least one direction is extremely small, when welding a metal plate, this member is melted by the molten metal flowing out from the butted portion and a recess is formed. Then, a back wave is formed in this recess.

Further, since the present member can easily make the properties such as the density constant, it is possible to obtain the back wave having a constant shape.

Further, even if the members are used in abutment with each other, no defect occurs in this portion.

[Operation] At the time of butt-welding for welding metal plates by forming a groove portion that opens in a fan shape from the tips at the end portions of at least two metal plates, and applying a backing material to this butted portion , The backing material is a molten metal that flows out from a stick-shaped material in which metal powder is wrapped in a metal foil with a thickness of 10 to 100 μ, melts this metal member and forms a recess of a certain shape in this member And also enables welding even when the metal plate is tilted or vertical, and also prevents the occurrence of defects in the abutting portion of the backing material.

[Effect of the Invention] When the metal plate is welded in a tilted state or in a vertical normal state,
Or even when the backing material is butt-welded in a T shape and welded,
A uniform defect-free weld can be obtained.

[Brief description of drawings]

FIG. 1 is a perspective view of one embodiment of the butt welding method according to the present invention, FIG. 2 is a sectional perspective view of a stick-like object, and FIGS. 3 and 4 are perspective views for explaining a conventional welding method. is there. In the figure, 1 is a metal plate, 2 is a butted portion, 3 is a groove portion,
4 is backing material, 6 is container, 7 is metal powder, 8 is metal foil, 9
Indicates a stick-like material.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ryuichi Araki 16-22 Higashiterao Kitadai, Tsurumi-ku, Yokohama-shi, Kanagawa (72) Inventor Koichi Horikoshi 2-22-115 Serigatani, Konan-ku, Yokohama-shi, Kanagawa (72) Inventor Keisuke Hattori 63-2, Higashikawashima-cho, Hodogaya-ku, Yokohama-shi, Kanagawa Prefecture (72) Tatsuo Nakamura, 2-chome Fuso-cho, Amagasaki-shi, Hyogo (72) Inventor Norio Uchida Fuso-cho, Amagasaki-shi, Hyogo 2-chome 1 Sumikin Welding Industry Co., Ltd. (72) Inventor ▲ Tsuka ▼ Moto Soan 2-1, Fuso-cho, Amagasaki City, Hyogo Prefecture Sumikin Welding Industry Co., Ltd. (72) Inventor Yoichi Nishio Fuso, Amagasaki City, Hyogo Prefecture 2-1-1, Sumikin Welding Industry Co., Ltd. (72) Inventor, Kazuya Inui 2-1-1, Fusocho, Amagasaki City, Hyogo Prefecture Sumikin Welding Industry Co., Ltd. (56) Reference Document JP Akira 55-73498 (JP, A) JitsuHiraku Akira 55-43646 (JP, U) JitsuHiraku Akira 53-132925 (JP, U)

Claims (1)

[Claims] 1. A butt joint in which at least two metal plates are butt-jointed by forming a groove portion having a fan-shaped tip at the edge, and a backing material is applied to the butt portions to weld the metal plates. In the welding method, the butt welding method is characterized in that the backing material is made of a stick-like material by wrapping a metal powder in a metal foil having a thickness of 10 to 100 µ.