采用Nd：YAG激光器实现200μm厚Ni
The welding joint of Ni47Ti44Nb9 shape memory alloy with thickness of 200 μm was achieved by Nd:YAG laser, and the laser process parameters were investigated by orthogonal experiment. The welding joint microstructure was observed by optical microscopy, the strength of extension of the joint was tested by precision stretcher, and the micro-hardness of the welding joint was tested with the precision hardmeter. The results shows that the best laser parameters of jointing Ni47Ti44Nb9 shape memory alloy with thickness of 200 μm are that the average power is 16.8 W, the width of pulse is 4.5 ms and the frequency is 4.5Hz. At this time, the tensile strength is 880 MPa, reaching 95% strength of the base metal. The horizontal surfaces appear uniform scales striate. And there is a phenomenon of layering on the cross-section, the center of the welding joint is ultrafine axis crystal. The heat affected zone is the column structure. The longitudinal section is exchange distribution of equiaxed grains and pseudoeutectic of NiTi-βNb. The average hardness of the welding joint is greater than that of the base metal.
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