Gradient transition connection method of steel/titanium dissimilar metal based on laser synchronous preheating deposition

Abstract

The invention relates to the technical field of laser machining, in particular to a gradient transition connection method of steel / titanium dissimilar metal based on laser synchronous preheating deposition. The method comprises the following steps of (1) machining and cleaning a substrate, wherein the joint form is butt joint or corner joint; (2) preheating, specifically, preheating the cross section of the deposition position of a titanium alloy base material by adopting laser; (3) powder preparation, specifically, weighing the stainless steel and the titanium alloy, and separately mixing theweighed stainless steel and titanium alloy with a nickel-based alloy; (4) laser deposition and synchronous preheating, specifically, preheating a deposition layer after laser deposition for a certainperiod of time, then continuously depositing, and alternately performing; (5) post-heating, specifically, continuously running the laser to perform post-heat treatment on the deposition layer; and (6) welding, specifically, obtaining the titanium / nickel / steel gradient deposition layer and performing welding. The method solves the problems of low strength and poor toughness of a welding joint caused by the fact that a continuous and high-brittleness intermetallic compound is extremely easy to form at an interface in the traditional fusion welding, high-energy beam welding and solid-phase connection process of the titanium alloy and the stainless steel at present.

Description

technical field [0001] The invention relates to the technical field of laser processing, in particular to a gradient transition connection method based on laser synchronous preheating deposition of steel / titanium dissimilar metals. Background technique [0002] Welding of dissimilar materials has potential advantages in terms of cost savings, weight reduction, product design flexibility, and enhanced product functionality, and has continuously attracted the attention of the industry. However, there are still some unresolved issues in joining dissimilar metal materials, especially the weakening of mechanical properties caused by the formation of brittle intermetallic phases in welds. The heterogeneous joining of titanium alloys and stainless steels has broad application prospects in chemical, energy, aerospace, and nuclear applications. However, the direct welding process of titanium alloy and stainless steel FeTi and Fe 2 Brittle intermetallic compounds such as Ti are diff...

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Problems solved by technology

[0005] The purpose of the present invention is to make up for the defects of the existing technology, and to provide a gradient transition connection method based on laser synchronous preheating deposition of steel / titanium dissimilar metals, which solves the problem of traditional fusion welding, high energy beam welding and solid phase welding of titanium alloy and stainless steel. During the connection process, continuous and highly brittle intermetallic compounds are easily formed at the interface, resulting in low strength and poor toughness of the welded joint

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