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

A high-temperature titanium alloy, low-cost technology, applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc., can solve the problems of reduced toughness, reduced degree of alloying in the weld zone, and material plasticity

Inactive Publication Date: 2011-02-09
INST OF METAL RESEARCH - CHINESE ACAD OF SCI +1
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  • Abstract
  • Description
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  • Application Information

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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

Method used

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

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Embodiment Construction

[0018] The present invention will be further described in detail through the following several preferred embodiments, but the present invention is not limited to the following several embodiments.

[0019] Table 1

[0020]

[0021] The smelting process of titanium alloy within the composition range of the present invention is as follows: the raw material adopts 0-grade sponge titanium, the alloy element Si is in the form of Al-Si master alloy, Al and Zr are in the form of pure metal, Sn is in the form of TiSn master alloy, and Mo is in the form of Al-Mo master alloy join in. After the master alloy and titanium sponge are batched and mixed, they are pressed into small electrodes with a press. Several small electrode groups are welded together, put into a vacuum consumable electrode electric arc furnace and smelted twice to make an alloy ingot. After the cap is cut off and the surface defects are removed, the ingot enters the thermal processing process. Ingot billeting→hyd...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/40B23K35/32
Inventor 王清江刘建荣陈志勇朱绍祥刘羽寅李晋炜锁红波陈哲源
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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