Abstract
Dissimilar welding of Nitinol shape memory alloy to Ti–6Al–4V with copper interlayer was performed by a pulsed Nd:YAG laser beam and effect of interlayer thickness on microstructure, chemical composition, mechanical properties and fracture behavior was investigated. The results indicated that the thickness of interlayer has a great influence on chemical composition and Ultimate Tensile Strength of joints. With the increase of interlayer thickness to 75µm, tensile strength and elongation of the joint reached the maximum value of 300MPa and 3.3%. Further increase in interlayer thickness resulted in deterioration of mechanical properties because of formation of Ti–Cu IMCs and shrinkage cavities in weld metal. This shows that the thickness of the copper interlayer for dissimilar welding of these alloys needs to be optimized.
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