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Joined body of dissimilar materials comprising steel material and aluminum material, and joining method therefor

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TLDR
In this article, the purpose is to provide a joined body of dissimilar materials comprising steel material and aluminum material, which can be obtained by spot welding with high joining strength; and a spot welding method therefor.
Abstract
The purpose is to provide a joined body of dissimilar materials comprising steel material and aluminum material, which can be obtained by spot welding with high joining strength; and a spot welding method therefor. A joined body (3) is obtained by spot welding a particular thick steel material (1) and an aluminum material (2). The area of a nugget (5) in a spot weld is determined in relation to the plate thickness of the aluminum material (2). The area of the portion of a boundary reaction layer (6) having a thickness of 0.5-10 μm in the nugget (5) is determined in relation to the plate thickness of the aluminum material (2), and high joining strength is obtained.

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