Low-cost titanium alloy welding wire suitable for welding titanium alloy at high temperature of over 520 DEG C

Abstract

The invention discloses a low-cost titanium alloy welding wire suitable for welding titanium alloy at a high temperature of over 520 DEG C. The welding wire comprises Al, Sn, Zr, Mo and Si five alloy elements and is characterized in that: the Si is increased to share part of the high-temperature strengthening effect of the Al, Sn and Zr, so that the added amount of the alloy elements is reduced, the metal in a weld zone has relatively high deformation capability, the cracking tendency of a high-temperature titanium alloy weld is restrained, and meanwhile, the metal in the weld zone also keeps the strength of a base material, high-temperature lasting resistance and room-temperature deformation capability. Besides the ingredient range of the welding wire, the invention also provides three different types of optimal welding wire ingredients and a thermal treatment process according to the different requirements of aerospace industry on sheet welding. The welding wire in the invention can be produced by a conventional process, is high in yield and therefore is low in cost. Along the widespread application of the high-temperature titanium alloy in the aerospace field, the welding wire has a promising application prospect and is expected to create huge social and economical benefit.

Description

Technical field: [0001] The invention belongs to the technical field of titanium-based alloys, and in particular relates to a titanium alloy welding wire suitable for welding high-temperature titanium alloys above 520°C. Background technique [0002] In order to meet the design requirements of reducing weight and increasing the thrust-to-weight ratio of aircraft, it is necessary to increase the amount of titanium alloy materials with high specific strength as much as possible. In recent years, the use of titanium alloys on aircraft at home and abroad has shown a significant increase. The use and level of titanium alloys have become an important indicator to measure the advanced level of aerospace technology and aircraft performance at home and abroad. [0003] The use of welded structure is also an important means to improve the thrust-to-weight ratio. Using a welded structure instead of the traditional riveted structure not only reduces the number of parts, but also achiev...

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Problems solved by technology

The most notable feature of high-temperature titanium alloys is that they have high resistance to deformation at high temperatures. For this reason, high-temperature titanium alloys must adopt methods to increase the degree of alloying and reduce the addition of β-stabilizing elements. The resulting problem is the material In order to improve the deformation resistance of the as-cast structure of the joint, it is necessary to reduce the alloying degree of the weld zone, and at the same time ensure that its high temperature deformation resistance is not lower than that of the base material, so as to avoid failure of the joint during service. This is the biggest challenge encountered in the development of Ti-55 welding wire

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