Laser Welding Method of Titanium Alloy-Stainless Steel Dissimilar Metal with Vanadium Interlayer

Abstract

The invention relates to a vanadium intermediate layer-added titanium alloy-stainless steel dissimilar metal laser welding method, and belongs to the technical field of material welding (connecting). The formation of an omega brittle phase in a titanium alloy-vanadium welding seam and a sigma brittle phase in a vanadium-stainless steel welding seam is controlled and the brittleness of a joint is reduced by precisely controlling welding process parameters by adopting laser as a welding heat source and taking vanadium as an intermediate layer. A high-quality and high-efficiency welding joint which contains a titanium alloy-vanadium welding seam and an un-molten vanadium layer-stainless steel welding seam and is made of dissimilar metals is obtained by adopting two-time welding. The vanadium intermediate layer-added titanium alloy-stainless steel dissimilar metal laser welding method comprises the following steps: performing plate grouping and clamping, performing titanium alloy-intermediate layer-stainless steel contact surface pre-tightening force regulating, and welding a titanium alloy-vanadium contact surface and a vanadium-stainless steel contact surface respectively, so that the connecting of titanium alloy-stainless steel dissimilar metals is realized. The vanadium intermediate layer-added titanium alloy-stainless steel dissimilar metal laser welding method has the advantages that a laser welding process is stable; a welding seam is attractive; the welding defects, such as cracks, air holes, undercut edges, incomplete welding and incomplete fusing, are avoided; and the welding process performance is good.

Description

technical field [0001] The invention relates to the technical field of material welding (connection), in particular to a laser welding method of a titanium alloy-stainless steel dissimilar metal with a vanadium intermediate layer. Used in aerospace, medical, weapon manufacturing and other technical fields. Background technique [0002] Titanium and titanium alloys are widely used in aerospace, medical, metallurgy, weaponry and other manufacturing fields due to their high specific strength, corrosion resistance and good processability. However, its high price limits the large-scale application of titanium alloys as structural parts. Therefore, titanium alloys and other metal materials, especially composite components of titanium alloys and stainless steel, have become an important development direction for welded parts in the fields of medical equipment and weaponry. A large number of brittle Ti-Fe intermetallic compounds are easy to be produced in titanium alloy-stainless ...

AI Technical Summary

Problems solved by technology

At the same time, by precisely controlling the laser offset, the formation of ω-brittle phases in titanium alloy-vanadium welds and σ-brittle phases in vanadium-stainless steel welds is suppressed, which solves the new brittleness problem introduced by adding an intermediate layer and improves The mechanical properties of the joint

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