Method of welding dissimilar metal materials and welded body of dissimilar metal materials
A method of welding dissimilar metal materials, wherein a high melting-point material and a low melting-point material which are dissimilar metal materials having melting points different from each other are positioned to a planned welding position, and a rotatable tool is pressed to and then inserted into the high melting-point material to thereby perform a friction-stir-welding between the high melting-point material and the low melting-point material to each other. The friction-stir-welding between the high melting-point material and the low melting-point material is performed by disposing an intervening piece made from a same material as the high melting-point material between the rotatable tool and the high melting-point material.
1. A method of welding dissimilar metal materials, comprising:
preparing a rotatable tool;
positioning a high melting-point material and a low melting-point material which are dissimilar metal materials having melting points different from each other to a planned welding position;
pressing the rotatable tool to the high melting-point material and then inserting the rotatable tool thereinto while rotating the rotatable tool; and
performing a friction-stir-welding between the high melting-point material and the low melting-point material to each other,
wherein the friction-stir-welding between the high melting-point material and the low melting-point material is performed by disposing an intervening piece made from a same material as the high melting-point material between the rotatable tool and the high melting-point material, and
wherein the high melting-point material and the intervening piece are an iron material, and the low melting-point material is either one of an aluminum material or a magnesium material.
2. The method of claim 1 , wherein the friction-stir-welding is performed by setting the high melting-point material and the low melting-point material in a fixed state, and setting the intervening piece in a non-fixed state.
3. The method of claim 1 , wherein the intervening piece has a length of a longest portion in dimension set at 25% or more with respect to a diameter of a circle-shaped contact surface of the rotatable tool.
4. The method of claim 1 , wherein the intervening piece has a plate thickness set at 0.2 mm or more.