Diffusion welding method of titanium or titanium alloy and stainless steel

Abstract

The invention discloses a diffusion welding method of titanium or titanium alloy and stainless steel. A plate pack having the same material quality with welded workpieces is welded into a block structure in advance. The plate pack is lengthways cut into slices along the block structure to form a structural middle layer 7. The middle layer is processed and then vertically arranged between the welded workpieces for diffusion welding. Because the middle layer having the same material quality with the workpiece is adopted, a joint heterogeneous interface combination mode is changed into a combination mode that half heterogeneous workpieces are directly combined and half heterogeneous workpieces are combined, and the titanium or titanium alloy and stainless steel workpieces are in high-intensity connection. In the diffusion welding method, the tensile strength of the joint is improved to above 80% from 50-70%(week side workpiece intensity) obtained by the direct diffusion welding technology, and various types of titanium or titanium alloy and stainless steel can be in high-intensity connection.

Description

technical field [0001] The invention relates to a diffusion welding method, in particular to a diffusion welding method of titanium or titanium alloy and stainless steel. Background technique [0002] Titanium or titanium alloys have high specific strength, excellent corrosion resistance and good processability, and are widely used in aerospace, medical, metallurgy and other fields, and are known as the third rising contemporary metal. However, the primary problem limiting the application and promotion of titanium alloys is the high price. The price of stainless steel is relatively low, and it is a more commonly used material in industry. Composite components of titanium or titanium alloy and stainless steel can give full play to their complementary advantages in performance and economy, and have broad application prospects in aerospace, national defense and chemical industries. [0003] Vacuum diffusion welding is a precise solid-phase joining method, which means that und...

AI Technical Summary

Problems solved by technology

However, considering that the addition of the third material intermediate layer often reduces the corrosion resistance of the joint and the continuity of the joint performance transition, and the processing cost of the micron-sized copper foil used in the intermediate layer is relatively high, so this method is used in most case is not allowed

[0006] The Chinese patent "An Active Composite Gradient Barrier Diffusion Welding Method for Titanium-Al-Based Alloy and Steel" with application number 02133239.8 discloses an active composite gradient barrier diffusion welding method for titanium-aluminum-based alloy and steel. Micron-sized titanium, nickel, copper, and niobium metal foils are added between the two to achieve an effective connection between the two, but there are also shortcomings in the high cost of the intermediate layer used and the reduction of joint corrosion resistance and performance transition continuity.

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