A review of rotary friction-based solid-state joining processes
Solid-state welding and processing methods will be an alternative to joining lightweight metals that cannot be welded using conventional fusion welding processes. After three decades after its invention, FSW is the first choice in joining high-strength aluminum alloys with an application in automotive and aerospace. The process is also capable of joining other alloys too. Due to the success of FSW, it was considered for more complicated applications and joining high-strength alloys. It should be noted that FSW is not the only successful rotary friction-based solid-state welding process. In recent years, friction hydro-pillar processing (FHPP) which is successful in repairing surface and body cracks and defects of different steel grades is also very interesting. In the present study, main rotary friction-based welding and processing methods are introduced and discussed in two major classes including friction stir welding and friction hydro-pillar processing.
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