Analysis of Ni interlayer effects on laser beam welding of dissimilar pure Mo alloy to stainless steel
Source abstract
Abstract
Abstract The effect of Ni interlayer thickness on chemical composition, microstructure and mechanical properties of laser welding of Mo and stainless steel was analyzed systematically. Experimental results indicated that with the increase in thickness of Ni interlayer, the number of Mo Fe IMCs, the hardness at the Mo-FZ interface, the width and grain size in the heat affected zone of Mo side and the thickness of Mo Fe IMCs layer decreased significantly. The maximum tensile strength attained 351 MPa for joints with 0.1 mm thick Ni interlayer. With excessive (>0.1 mm) Ni addition in the welded joint, the mechanical properties deteriorated due to the formation incomplete fusion, void and crack defects. The tensile investigation showed that the weakest area of the joint was Mo Fe IMCs layer. When an appropriate thickness of Ni interlayer is used, the Mo Fe IMCs layer can be strengthened by increasing diffusion ability of Mo to FZ and Ni concentration in the Mo Fe IMCs and restraining of Mo Fe IMCs, consequently producing high-quality welded joints.
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