TS-065427 — The Ohio State University has developed a novel self-fil
ling friction stir welding tool that e
liminates keyhole defects caused by tool pin retraction.
Friction stir welding (FSW) and friction stir processing (FSP) are solid-state processes that utilize the heat generated from a rotating pin tool to soften the base metals for fusion and repair, respectively. However, keyhole defects are inevitably left after retracting the tool pin, which can ge…