Research on stir welding

摘要

Cambridge, England-based TWI's research on friction-stir welding has led to development of Re-stir, a reversal-stir welding process. It may be applied as both angular reciprocating, where reversal is imposed within one revolution, and rotary reversal, where reversal is imposed after one or more revolutions. The process was tested on and is now considered appropriate for butt, lap, and spot-welding applications because it generates symmetrical welds that eliminate problems associated with asymmetry inherent in conventional friction-stir welding. Butt Welding For butt welding tests, technicians used a 6 mill-thick 5083-O condition aluminum alloy and a MX-Triflute probe. The result was an essentially symmetrically shaped weld region that narrows toward the plate's top. By comparison, conventional rotary-friction stir welding produces an asymmetrically shaped weld.