On the problem of tool destruction when obtaining fixed joints of thick-walled aluminum alloy blanks by friction welding with mixing

OBRABOTKAMETALLOV Vol. 23 No. 3 2021 MATERIAL SCIENCE EQUIPMENT. INSTRUMENTS Fig. 1. Scheme of friction stir welding in the longitudinal section ( a ), cutting of metallographic samples after tool destruction in the longitudinal section ( b ) and transverse section ( c ): 1 – stir zone; 2 – tool pin; 3 – tool loading force; 4 – direction of tool movement; 5 – base metal; 6 – longitudinal metallographic section; 7 – a stuck piece of tool; 8 – stir zone of remaining tool part; 9 – remaining tool part; 10 – transverse metallographic section а b с Ta b l e 1 Friction stir welding parameters Sample number Loading force P , kg Tool travel speed, V , mm/min Tool rotation rate, w , rpm Tool pitch angle, Deg. 1 3700 60 300 2,5 2 3900 65 300 2,5 3 4100 60 280 2,5 4 4100 60 260 2,5