Study on Interface Bonding Mechanism and Mechanical Properties of Aluminum Steel Dissimilar Material Refill Friction Stir Spot Welding Joint
Taking 5754 aluminum alloy and DC04 steel as the base materials,the refill friction stir spot welding tests were carried out,which revealed the effects of penetration depth of the stirring sleeve on the microstructure characteristics and the mechanical properties of the joints.The results show that metallurgical bonding is the main bonding mechanism of aluminum-steel interface when the stirring sleeve is not inserted into the lower steel plate.When the stirring sleeve is inserted into the lower steel plate,the aluminum-steel interface simultaneously undergoes mechanical interlocking and metallurgical bonding.The mechanical interlocking mainly occurs in the action area of the stirring sleeve.Through optimizing process parameters,the optimal parameters are obtained as follows:the rotational speed,welding speed and sleeve penetration depth are 2000 r/min,0.5 mm/s and 1.45 mm,respectively.The maximum tensile shear failure load of the joint is 5105 N.
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