A kind of brazing method of titanium-steel plate butt joint with dual heat sources and low heat input

Abstract

The invention belongs to the field of material processing engineering, and particularly relates to a double-heat-source low-heat-input soldering method for butt joint of a titanium-steel plate. Soldering connection of titanium and steel is achieved through double-heat-source low-heat-input welding; according to the different expansion coefficients of titanium and steel, heat distribution between the two metals is improved in the welding process by controlling energy parameters and position parameters of the two heat sources on the front side and the back side, and the probability of heat mismatching between titanium and steel is lowered; and generation of Ti-Fe brittle compounds is effectively restrained, the residual stress of a joint is effectively reduced, and efficient and reliable connection of the joint is achieved. Moreover, through direct heating and gas protection of the heat source on the back side to the back side of the joint, wetting and spreading of a filter metal on theback side of the joint is promoted, and the formation of a weld is greatly improved. In the welding process, the process similar to preheating before welding or heat treatment after welding can be provided by changing the relative positions of the heat source on the front side and the heat source on the back side in the welding direction. The double-heat-source low-heat-input soldering method is easy to operate and suitable for soldering, melt welding, melt soldering and the like.

Description

technical field [0001] The invention relates to the field of material processing engineering, in particular to a brazing method for butt jointing of titanium-steel plates with dual heat sources and low heat input. Background technique [0002] Titanium and titanium alloys have good low-temperature toughness and high-temperature strength, especially high specific strength, and are widely used in the manufacture of structures in the aerospace field. However, the high cost of titanium limits its popularization and application in the engineering field. As a widely used engineering material, stainless steel is cheap and has good thermal conductivity and mechanical properties. The welding of titanium and steel can not only make full use of the advantages and characteristics of their respective materials, but also reduce costs and improve economic benefits, and has broad application prospects. [0003] Although the connection of titanium-steel dissimilar metals has the dual advan...

AI Technical Summary

Problems solved by technology

At the same time, the uneven heating of the joints further deteriorates the distribution of residual stress in the joints and deteriorates the performance of the joints

Yan Jiuchun from Harbin Institute of Technology used the TIG welding method to weld titanium alloy-stainless steel with Cu as the filler material. The results showed that it was difficult to effectively suppress the formation of Ti-Fe brittle compounds by using the TIG welding method, and it was difficult to obtain a titanium-steel joint with reliable performance

Once the base metal of the joint is melted, the interface is connected by a liquid / liquid interface, the atomic diffusion speed is fast, it is difficult to suppress the formation of Ti-Fe intermetallic compounds, and the performance of the joint is difficult to meet the requirements

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