This paper presents a feasibility study on spot friction welding of AZ31, a wrought magnesium alloy available in sheet form. The investigations were carried out in comparision with resistance spot welding and the spot friction weld strengths agree favorably with minimum spot weld strengths specified by the Resistance Welder Manufacturers' Association for similar Mg alloy sheet using the recommended 15.9-mm-diameter resistance spot welding. In detail, lap joints of 1.58-mm-thick magnesium alloy AZ31B-0 sheet were produced by spot friction welding. The spot welds were made in 2 sec with a 15-mm-diameter pin tool rotating at 500-2,000 rpm. The tool was inserted into 2-sheet stack-ups to depths of either 2.4 or 2.8 mm relative to the top sheet surface. Tensile-shear testing showed that joint strengths up to 4.75 kN could be obtained. The removal of surface oxides from the sheets prior to welding increased lap shear strengths by about 50% at the 2.4-mm insertion depth and it promoted failure by nugget pull-out rather than by interface separation.
A feasibility study on spot friction welding of magnesium alloy AZ31
2005
8 Seiten, 6 Bilder, 27 Quellen
Conference paper
English
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