Influence of Welding Process Parameters on Joint Surface Topography and Tensile Shear in Friction Stir Spot Welding of Ti/Al
The friction stir spot welding of 3 mm thick sheets of 2A14 aluminum alloy and 3 mm thick sheets of TC4 titanium alloy was conducted using tool with cylindrical pin. The influences of welding process parameters on the tensile shear properties and surface topography joints of friction stir spot welding were investigated under various process parameters of spot welding joints surface morphology observation and shear tensile test。 The results show that:within the scope of the experiment, with the increase of tool rotation speed, the tool penctration depth,and welding time, the surface shaping becomes better. When process parameters increase too large,the surface shaping gradually becomes poor again. With the increase of tool rotation speed, the tool Penctration depth,welding time, the tensile shear increasesm first, and then reduces. The tensile shear tests show that optimized friction stir spot welding process parameters is that when the rotary speed reaches 950r/min and pressed shoulder depth 0.3mm with the holding time 9s, the surface topography of spot-welded joint is good, and the maximum shear strength of the welded joint can be realized and the maximum shear strength is 7.262 k N.