Improvement of Impact Strength for Copper/Aluminium Friction Welded Joint.

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  • 銅とアルミニウムの摩擦圧接継手の衝撃強度向上
  • ドウ ト アルミニウム ノ マサツ アッセツ ツギテ ノ ショウゲキ キョウド

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Abstract

The friction welding for copper and aluminum is useful to minimize the diffusion thickness at the interface between copper and aluminium. The minimization of diffusion thickness is required for maintaining the joint strength. However, it is generally difficult to maintain the joint strength. Because brittle intermetallic compounds are necessarily formed at the friction weld interface between copper and aluminium. The improvement techniques on joint strength characteristics have not fully been clarified. In this study, stress singularities at the intersection of free surfaces and the interface between copper and aluminium were investigated using finite element analysis. It was informed that the no free-edge stress singularities existed below an apex angle of 59° and between angles of 98° and 126°. In this experiment, copper and aluminium friction welded joints were fabricated as to minimize (>1μm) the welding condition of the diffusion thickness at the interface between copper and aluminium. It was confirmed that the good tensile strength could be observed in all cases tested. However, the Charpy impact energy became comparatively low in case of an apex angle of 90°, and showed a remarkable high impact energy can be obtained in case of no free edge stress singulalities.

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