Method for joining dissimilar metal materials and dissimilar metal joining structure

Abstract

To provide a dissimilar metal material joining method that can join a first component and a second component in an easy process without causing joining defects when an insulation layer is interposed between the first component and the second component.SOLUTION: A dissimilar metal material joining method has: a first process in which a second component 2, which has a first hole 2a and comprises a material different from a first component 1, is located on the first component 1 made of a steel; a second process in which a conductive bottom member (electric conduction member) 5, which is electrically conducted to the second component, is located in an interior or at a bottom of the first hole 2, and a joining auxiliary member 4, which has a second hole 4c and has a main component equal to the first component 1, is inserted into the first hole 2a; and a third process in which weld metal 9, which has a main component equal to the first component 1, is formed in the second hole 4c. An insulation layer 3 is interposed between the first component 1 and the second component 2. In the third process, a tip of a welding wire 7 is brought into contact with the bottom member, and the welding wire 7 and the second component 2 are electrically conducted via the bottom member 5, thereby generating an arc.SELECTED DRAWING: Figure 1B

Claims

1. A first step involves placing a second member, made of a different material from the first member and having a first hole that penetrates in the thickness direction, on a first member made of steel. A second step involves placing a conductive current-carrying member that supplies current to the second member inside or at the bottom of the first hole, and inserting a bonding auxiliary member having a second hole and the same main component as the first member into the first hole. A method for joining dissimilar metal materials, comprising: a third step of forming a weld metal having the same main component as the first member inside the second hole by arc welding, An insulating layer is interposed between the first member and the second member. The joining auxiliary member comprises a flange portion disposed on the surface of the second member opposite to the contact surface with the first member, and a shaft portion inserted into the first hole, wherein the second hole is formed to extend in the axial direction of the shaft portion. A method for joining dissimilar metal materials, characterized in that, in the third step, the tip of the welding wire is brought into contact with the energizing member, and the welding wire and the second member are energized through the energizing member to generate an arc.

2. The method for joining dissimilar metal materials according to claim 1, characterized in that the insulating layer is an electrodeposited coating film formed on the surface of the first member.

3. The method for joining dissimilar metal materials according to claim 1 or 2, characterized in that the current-carrying member is integrated with the joining auxiliary member, the second hole is formed in a bottomed shape, and at least one of the current-carrying member and the joining auxiliary member is in contact with the second member.

4. The current-carrying member and the joining auxiliary member are arranged at a distance from each other. The method for joining dissimilar metal materials according to claim 1 or 2, characterized in that the current-carrying member is in contact with the second member.

5. The method for joining dissimilar metal materials according to claim 1 or 2, characterized in that the thickness of the current-carrying member is thinner than the thickness of the flange portion of the joining auxiliary member.

6. The method for joining dissimilar metal materials according to claim 5, characterized in that the thickness of the conductive member is 0.5 mm or less.

7. A first member made of steel, A second member is placed on the first member, has a first hole that penetrates in the thickness direction, and is made of a different material from the first member, An insulating layer interposed between the first member and the second member, A conductive current-carrying member is disposed inside or at the bottom of the first hole, A joining auxiliary member having a flange portion disposed on the surface of the second member opposite to the contact surface with the first member, a shaft portion inserted into the first hole, and a second hole parallel to the axial direction of the shaft portion, and having the same main component as the first member, A dissimilar metal joint structure characterized by having a weld metal formed inside the second hole and having the same main component as the first member.

8. The dissimilar metal joint structure according to claim 7, characterized in that the insulating layer is an electrodeposited coating film formed on the surface of the first member.

9. The dissimilar metal joint structure according to claim 7 or 8, characterized in that the current-carrying member is integrated with the joining auxiliary member, the second hole is formed in a bottomed shape, and at least one of the current-carrying member and the joining auxiliary member is in contact with the second member.

10. The current-carrying member and the joining auxiliary member are arranged at a distance from each other. The dissimilar metal joint structure according to claim 7 or 8, characterized in that the current-carrying member is in contact with the second member.

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