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Abstract
It is expected that the material ratio of steel for an automobile will decrease rapidly in next decade due to the rise of electric vehicles, and multi-materialization of parts will be promoted consequently. Hence, technologies for dissimilar materials joining have been studied by researchers successfully for recent years. The authors have studied dissimilar materials joining with utilizing friction-stir forming (FSF) approach. The FSF is a friction-stir process invented by Nishihara in 2002. In FSF, a substrate material was put on a die firstly. Next, friction stirring was conducted on the back surface of the material. The material then deformed and filled the cavity of the die due to high pressure and heat caused by the friction stirring. The authors utilized the FSF approach to generate mechanical joints between dissimilar materials. In this presentation, the author introduces various techniques for joining dissimilar materials with employing the FSF.
Highlights
The material ratio of normal steel in automobiles is expected to be rapidly reduced in decade due to the use of high-specific-strength materials because of strict demand of lightweight parts
We present a mechanical joining technique using plastic deformation of the joined materials and introduce its applications
These results imply that the two key factors to estimate the forming limit: the internal compression-force and softening of the material, and the volume of deformable material generated by the friction stirring
Summary
The material ratio of normal steel in automobiles is expected to be rapidly reduced in decade due to the use of high-specific-strength materials because of strict demand of lightweight parts. The methodology delivers enough joint strength without considering the metallurgical condition of joined materials. It requires fasteners and increases the weight of the parts. Friction stir welding (FSW) is a promising methodology for dissimilar materials joining. It was invented in the Welding Institute (TWI) in the UK in 1991 as a joining technique for aluminum members [1]. Abe et al [5] conducted mechanical clinching of zinc-aluminum alloy coated steel and aluminum alloy sheets In this type of mechanical joining, materials can be chosen without regarding metallurgical restrictions.
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