| Abstract | In this study, 2-mm thick AZ31B-H24 Mg alloy sheets were friction stir welded in a lap joint configuration at different tool rotational rates (1000 and 1500 rpm) and welding speeds (10 and 20 mm/s). The tensile behavior of these lap joints was then evaluated at low (-40°C), room (25°C), and elevated (180°C) temperatures. The room temperature mechanical behavior indicated that the tensile failure load increased with decreasing heat input, i.e. decreasing tool rotational rate and increasing welding speed, such that a maximum failure load was obtained for operational conditions of 1000 rpm and 20 mm/s. This tendency in the failure load was also apparent for all the temperatures tested in this work. Compared to the room temperature condition, however, the fracture strengths decreased at both low and high temperatures, probably due to the relatively brittle and ductile behaviors demonstrated, respectively. The fracture modes were further detailed by using fractographic analysis. |
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