In this paper,the laser thermal conductivity welding process was used to prepare titanium/steel lap welded joints using Cu-Ni interlayer.The changes in the microstructure and properties of the welded joints were studied by changing the laser power.The research shows that the addition of Cu-Ni interlayer changed the microstructure and element distribution of titanium/steel laser welding pool.Through SEM,EDS and XRD,it was found that new phases such as Ti-Ni and Ti-Cu were formed on the side near the titanium base material,which effectively inhibited the formation of Fe-Ti binary brittle phase.The mechanical experiments show that the mechanical properties of titanium/steel welded joints are the best when the laser power is 2900W,and the maximum shear force is 1845.02N,indicating that the addition of Cu-Ni interlayer improves the weldability of titanium/steel dissimilar metals.
titanium/steel dissimilar metalslaser weldinginterlayermicrostructure and properties
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