Titanium/steel composites were prepared by machine tool machining and composite welding mechanism

Abstract

In this work, the machine tool machining and compound welding mechanism are combined to create a new processing technology. Dissimilar welds between stainless steel (SS) and Ti alloy were produced with mechanical joining and metallurgical joining technique. The mechanical joining of the Cu interlayer, CuZnSn filler and Ti alloy was connected by screws, and then the laser weld formed at the SS/Cu interface due to the good weldability of Fe and Cu. Brazing weld at Ti/CuZnSn interface formed through the SS side weld heat conduction, which realized the mechanical and metallurgical double joining of the SS/Ti joint and improved the strength of the joint. Unmelted Cu interlayer was retained by laser offset to the SS side to achieve heat transfer to the CuZnSn and Ti alloy. The CuZnSn filler was not melted, but the eutectic reaction with low melting point still occurred by atomic diffusion. The joint fractured at the Ti side interface with the maximum tensile strength of 199 MPa. This method combines the advantages of machine tool machining and metallurgical machining at the same time.