Welding method for surface treatment of steel and titanium or steel and titanium alloy

Abstract

The invention discloses a welding method for surface treatment of steel and titanium or steel and titanium alloy. The welding method comprises the following steps: step 1: an injection layer of titanium is formed on near surface and surface of the steel substrate through the ion-injection method; step 2: a sedimentary layer of titanium is deposited on the surface of the injection layer through the multi-arc ion plating method; step 3: the surface of the sedimentary layer is adopted as a surface to be welded; the sedimentary layer and titanium or the sedimentary layer and the titanium alloy are subject to the diffusion welding. According to the invention, metallurgical connection between titanium and steel or between the titanium alloy and the steel is achieved; the formation and the diffusion of inter metallic compounds of the titanium and the steel or the titanium alloy and the steel under high temperature are effectively reduced; the brittleness of the welded joints is reduced, so that the operational performance of the welded joints is remarkably improved and industrial application of structural components can be met.

Description

technical field [0001] The invention belongs to the field of welding, and more specifically, the invention relates to a welding method of surface-treated steel and titanium or titanium alloy. Background technique [0002] Since the welded components of dissimilar metal titanium and stainless steel can make full use of the respective advantages of the materials and maximize the characteristics of the materials, the welded joints of titanium and steel are widely used in aviation, aerospace, Petrochemical, shipbuilding and other industrial sectors. [0003] However, titanium is easy to form FeTi and Fe with iron and carbon in steel at high temperature. 2 Ti, Fe 2 Ti 4 Compounds such as O and TiC increase the brittleness of welded joints; in addition, the linear expansion coefficients of steel and titanium differ greatly, which reduces the bonding strength of welded joints and affects the performance of welded joints between titanium and steel. [0004] The invention patent ...

AI Technical Summary

Problems solved by technology

However, the introduction of this method has expanded the number of interfaces between titanium and steel from one interface to N interfaces, including longitudinal interfaces and transverse interfaces. The connection strength of titanium and steel welded joints is largely affected by the pre-welded block The influence of the welding quality of the bulk structure; after processing, the properties of the connection interfaces in the slices cut from the block structure will be destroyed to a certain extent; at the same time, the slices are placed vertically between the titanium and steel interfaces to form multiple T-shaped The weld joint directly affects the connection strength of the joint

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