Abstract: As a solid phase welding technology, friction stir spot welding (FSSW) is a new process which is suitable for the joining of key components of automotive aluminum body, and the joints are in a state of significant multi-axial stress during service. In this paper, conventional FSSW welded joints were fabricated with 5052H32 and 6061T6 of automotive aluminum alloys under various joining conditions. The failure strength of multi-angle quasi-static tension was obtained by multi-axis loading tests. Thus, the macroscopic failure criterion which depended on resultant force under multi-axial load was proposed. Then the empirical criterion model of critical load was given using the power function form. The failure envelopes fitted well with the measured data, and the maximum prediction error was 11.8%. Moreover, the effect of different automotive joining conditions on static failure envelopes of FSSW joints was discussed. This empirical model provides reliable predictions for engineering applications, contributing to the strength safety evaluation and the modeling of this finite joint element.
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2019, Vol. 33 
