研究目的
Investigating the effect of beam offset towards titanium alloy on composition, microstructure, tensile properties and fracture mode of titanium/stainless steel joints welded with continuous Yb:YAG laser.
研究成果
Appropriate laser beam offset on the titanium side allows reducing the formation of brittle intermetallic phases to several 10 μm thin interface on the limit between stainless steel and the melted zone. The best average tensile and flexure strength were 174±69 and 297±48 MPa respectively for beam offset of 0.32 mm. The analysis of fracture surfaces revealed a complex mode of fracture determined by the local development of intermetallic layers.
研究不足
The study is limited to the effects of beam offset on the mechanical properties and microstructure of the welds. Additional investigation is necessary for an accurate description of tensile behavior of the welds in light of Weibull statistics, as well as NDE tests to understand if the micro-cracks appear immediately after the welding or during cutting process.
