Patent ID: 9085122
Filing Date: 2015-07-21
Classification: B23K,B32B,B62D,Y10T

Abstract:
1. A different material welded structure comprising: a thin plate-shaped iron member; and a thin plate-shaped light metal member, the iron member and the light metal member being integrally welded with each other, wherein the iron member comprises a stack of two or more thin steel plates, wherein the thin steel plates are electrodeposition-coated before welding to the light metal member such that an electrodeposition coating is formed on a first surface of the stack welded to the light metal member, on an opposite surface of the stack located opposite to the first surface, and on respective intermediate surfaces of the thin steel plates located between the first surface and the opposite surface, wherein the iron member and the light metal member are friction stir welded by superimposing the iron member and the light metal member on each other, applying a seal material to respective superimposed surfaces of the iron member and the light metal member, the superimposed surfaces facing to each other, inserting a rotating tool for friction stir welding while rotating into the light metal member toward the iron member by moving the rotating tool in a direction perpendicular to the superimposed surfaces, and further inserting the rotating tool for friction stir welding while rotating into the iron member, and wherein, of the two or more thin steel plates, the thin steel plate welded to the light metal member has a bent portion formed by bending at an end thereof, wherein the iron member and the light metal member constitute a sub-frame structure of a vehicle, and the thin steel plate welded to the light metal member extends beyond the light metal member at the outside end of the sub-frame structure.