JPH08309549A - Metallic member welding method - Google Patents

Abstract

PURPOSE: To provide a welding method free of welding faults or detective welding with a little energy consumption, and capable of reducing stress concentration on the welding part and imparting an enough high welding strength. CONSTITUTION: Joining members 5 having contact faces 5a, 5b to contact to respective contact faces 1a1 , 1b1 of plural metallic members 1a, 1b are produced preliminarily and separately, these contact members 5 are arranged at angle corner parts 10 of the metallic members 1a, 1b, the spark is emitted in the gap between each contact face 5a, 5b and each contact face 1a1 , 1b1 of the metallic member 1a, 1b, then, the contact faces 5a, 5b and the contact faces 1a1 , 1b1 are melted and the metallic members 1a, 1b are welded mutually through the contact member 5.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Conventionally, when relatively large-sized structural parts such as the body of a construction machine are arc-welded, as shown in FIG.
By generating an arc between the corners 10 of the individual metal members 1a and 1b and the electrode wires 2, the electrode wires 2 are melted and built up on the corners 10. Then, as shown in FIG. 3A, a part of each metal member 1a, 1b is melted and the weld metal 2a is piled up on the corner portion 10 in multiple layers.

[0003]

The above-described conventional welding method has many problems as follows. (1) Due to the electric current, the entire electrode wire 2 and metal members 1a, 1
Since part of b is melted, power consumption increases. (2) Since the weld metal 2a is built up in multiple layers, defects Y are likely to occur between layers and the like.

(3) Since the amount of heat input is large, the amount of welding strain generated is large. (4) Since the electrode wire 2 usually has a larger specific gravity than the metal members 1a and 1b, the angle θ and the radius ρ of the toe of the weld metal 2a are small, and stress concentration is likely to occur. (5) It is difficult to adjust the shape of the weld metal 2a after solidification, and welding defects easily occur.

It is an object of the present invention to provide a welding method which is free from welding defects and welding defects due to low energy consumption, has a small stress concentration, and has a sufficiently high welding strength. is there.

[0006]

The present invention has been invented to solve the above problems, and the gist of the first invention is to join a plurality of metal members together.
A joint member having contact surfaces contacting each of the joint surfaces of the plurality of metal members is separately manufactured in advance, and a spark is generated between each contact surface of the joint member and each joint surface of the plurality of metal members. The method for welding a metal member is characterized in that only the contact surface of the joining member and the joining surface of the metal member are melted and the plurality of metal members are joined to each other via the joining member.

The gist of the second invention is that when joining a plurality of metal members, a joining member having an abutting surface that abuts on each of the joining surfaces of the plurality of metal members is separately manufactured in advance, The contact surfaces of the joint member and the joint surfaces of the plurality of metal members are pressed against each other to give electric resistance heat to melt only the contact surfaces of the joint member and the joint surfaces of the metal members. In the method for welding metal members, the metal members are joined to each other via the joining member.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described in detail below with reference to FIG. (A) First, as shown in FIG. 1 (A), two metal members 1a and 1b, which are members to be welded, are arranged at a required relative position (T shape in the figure). Then, the joining members 5 for contacting the corner portions 10 of the metal members 1a and 1b are separately manufactured in advance. This joining member 5 is preferably made of the same material as the metal members 1a and 1b,
Different materials may be used as long as they have good weldability.

The joining member 5 is the joining surface of the metal member 1a.
Comprising an abutment surface 5b abutting the joint surface 1b ₁ of the metal member 1b at right angles in contact with to the contact surface 5a to 1a _1, and a metal member
The length corresponds to the joint length between 1a and 1b. And
Its cross section is appropriately shaped to avoid stress concentration.

(B) As shown in FIG. 1 (B), the metal member 1
After connecting the a and 1b and the joining member 5 to the power source 7 by the lines 9a and 9b, the abutting surfaces 5a and 5b of the joining member 5 and the metal members 1a and 1b are arranged by arranging the joining member 5 at the corners 10. Joining surface 1
A predetermined gap is maintained between a ₁ and 1b ₁ .

(C) Next, as shown in FIG. 1 (C), the switch 8 is turned on to apply a voltage between the joining member 5 and the metal members 1a and 1b, so that the contact surfaces 5a and 5b are contacted. Bonding surface 1a
_1, dissolved these abutment surfaces 5a, 5b and the bonding surface 1a _1, 1b ₁ only skip a spark between the 1b _1. Thereafter, the joining member 5 is pressed against the corner portion 10 with the force P to fuse the molten metals with each other to join the joining member 5 and the metal members 1a and 1b to each other.

(D) Thereafter, as shown in FIG. 1 (D), the power source 7 is removed and the joining member 5 and the metal members 1a and 1b are allowed to cool. As a result, the joining member 5 is fixed to the corner portion 10, and a strong structural component in which the metal members 1a and 1b and the metal member 5 are integrated is completed.

FIG. 2 shows a procedure for welding the metal members 1a and 1b by butting them. In this case, a metal member
Grooves 1a ₂ and 1b ₂ are machined at the butt ends of 1a and 1b.
The joining member 5 is a contact surface that abuts on the groove 1a ₂ , 1b _2.
It has a trapezoidal cross section including 5a and 5d, and is preliminarily processed separately so as to have the same length as the grooves 1a ₂ and 1b ₂ .

Next, the joining member 5 is provided between the grooves 1a ₂ and 1b _2.
Are fitted to each other and the gaps between the groove 1a ₂ and the contact surface 5d and between the groove 1b ₂ and the contact surface 5e are maintained at a predetermined distance, and they are bonded in the same manner as in the first embodiment. In this case, the backing metal is not necessary and the extra shape can be formed arbitrarily.

In the above embodiment, sparks are blown between the joint surfaces of the metal members 1a and 1b and the contact surface of the joint member 5 to melt the joint surface and the contact surface. Only the joining surface and the contact surface can be melted by applying electric resistance heat while pressing the contact surface with the contact surface.

[0016]

The present invention has the following advantages. (1) Since only the joining surface of the metal member and the abutting surface of the joining member are melted, the heat input amount is smaller than that of the conventional overlay, and therefore the energy consumption amount can be reduced. (2) Since the joining member is manufactured separately and only the contact surface is melted, no welding defect occurs and no welding distortion occurs.

(3) Since the joining members are manufactured separately, they can have any cross-sectional shape, and therefore the angle and radius of the weld toe can be arbitrarily selected. (4) In the case of butt welding, the backing metal is not required and the overfill shape can be easily adjusted.

[Brief description of drawings]

FIG. 1 shows a welding procedure of one embodiment of the present invention, in which (A) to (D) are explanatory views of different states.

FIG. 2 shows a welding procedure according to another embodiment of the present invention, in which (A) and (B) are explanatory views of different states.

FIG. 3 shows a welding procedure of conventional fillet arc welding, (A)
, (B) are explanatory views of different states.

[Explanation of symbols]

1a, 1b Metal member 1a ₁ , 1b ₁ Joining surface 5 Joining member 5a, 5b Contact surface 7 Power supply 8 Switch 10 Corner

Claims (2)

[Claims] 1. When joining a plurality of metal members, a joining member having an abutting surface that comes into contact with each of the joining surfaces of the plurality of metallic members is separately manufactured in advance. A spark is blown between each of the joint surfaces of the plurality of metal members to melt only the contact surface of the joint member and the joint surface of the metal member to join the plurality of metal members to each other through the joint member. A method for welding a metal member, comprising: 2. When joining a plurality of metal members, a joining member having an abutting surface that abuts on each of the abutting surfaces of the plurality of metallic members is separately manufactured in advance, and each abutting surface of the joining member is formed. By applying electric resistance heat while pressing the respective joint surfaces of the plurality of metal members, only the contact surface of the joint member and the joint surface of the metal member are melted to cause the plurality of metal members to pass through the joint member. A method for welding metal members, characterized in that they are joined together.