Laser welding method of titanium alloy-stainless steel dissimilar metal by adopting composite intermediate layer

Abstract

The invention relates to a laser welding method of a titanium alloy-stainless steel dissimilar metal by adopting a composite intermediate layer, and belongs to the technical field of material welding (connection). According to the method, laser is adopted as a welding heat source, and a Ta/V/Fe composite layer is used as an intermediate layer material, so that formation of an omega brittle phase in a titanium alloy-vanadium welding line and an alpha brittle phase in a vanadium-stainless steel welding line can be controlled, the joint brittleness can be reduced, and the joint performance can be improved; by adopting the two welding, a high-quality high-efficiency welding joint which is made of a dissimilar metal material and contains a titanium alloy-vanadium welding line, an unmolten vanadium layer and a vanadium-stainless steel welding line can be obtained. The process comprises the steps of plate assembling and clamping, preload adjustment of a titanium alloy-intermediate layer-stainless steel contact face, and laser welding along the center line of a Ta intermediate layer and the center line of a Fe intermediate layer, so that connection of the titanium alloy-stainless steel dissimilar metal can be realized. The method has the advantages of stable welding process, attracted welding line formation, no welding defects including crack, pore, undercutting, uncomplete welding, incomplete fusion and the like, and good welding process performance.

Description

technical field [0001] The invention relates to the technical field of material welding (connection), in particular to a titanium alloy-stainless steel dissimilar metal laser welding method using a composite intermediate layer. Used in aerospace, medical, petrochemical and nuclear industries and other technical fields. Background technique [0002] Titanium and titanium alloys are widely used in manufacturing fields such as aerospace, medical, petrochemical, and nuclear industries 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, the composite components of titanium alloy and other metal materials, especially titanium alloy and stainless steel, have become an important development direction of structural manufacturing. A large number of brittle Ti-Fe intermetallic compounds are easy to be produced in titanium alloy-stainless steel ...

AI Technical Summary

Problems solved by technology

However, ω brittle phases are easy to form in titanium alloy-vanadium welds, and σ brittle phases are easy to form in vanadium-stainless steel welds. These brittle phases are not conducive to further improving joint performance.

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