High-frequency linear friction welding between aluminum alloys and stainless steal

Abstract

Intermetallic compound is one of the dominant factors for the dissimilar joints, e.g., Al-Fe joints. Since the joint strength generally decreases with the increasing intermetallic compound layer thickness, the development of a joining process that can inhibit the intermetallic compound growth is required. In the present study, we show the dissimilar joining between 5083/6063 aluminum alloys and 304 stainless steel by high-frequency linear friction welding working at 245 Hz. In order to investigate the relationship between the mechanical properties and the high-frequency linear friction process, the frictional heat at the interface was controlled by varying friction pressure. We found that sound joints with joint efficiency (95% and 90% for 5083 and 6063 aluminum alloys/304 stainless steel, respectively) were produced by a short-time high-frequency linear friction welding process below 2 s. Microstructural observation showed that a thin intermetallic compound layer was formed at the interface for both joints and that the intermetallic compound layer thickness was influenced by the dependence of the plastic flow behavior during linear frictional motion on pressure. We believe the high-frequency linear friction welding was demonstrated to enable the sound joining of various materials by controlling the friction pressure. The detailed results and discussion will be addressed in my presentation.