Welding process for titanium alloy workpiece

A welding process and titanium alloy technology, which is applied in the field of welding process of titanium alloy parts, can solve the problems of low tensile strength of the matrix, reduction of alloy strength, and deformation of parts, so as to avoid the reduction of alloy strength, high production efficiency and excellent welding process. easy effect

Pending Publication Date: 2022-07-08
CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Solution aging is mainly used for heat treatment of small-sized bars, and is not suitable for post-weld heat treatment of welded parts. It is easy to cause serious deformation of parts. The titanium alloy obtained after complex double annealing has better tensile strength, but the disadvantage of this process is that it is too It is complex and requires two vacuum heat treatments, among which rapid air cooling is required after heat preservation at 740-760°C, and a large-scale vacuum air quenching heat treatment furnace is required to achiev

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  • Welding process for titanium alloy workpiece

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Experimental program
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Effect test

Example Embodiment

[0028] Example 1

[0029] After cleaning the surface of the titanium alloy with acetone solution, fix the workpiece to be welded and put it into the vacuum heat treatment furnace. The vacuum working pressure in the vacuum chamber is 5×10 -2 Pa, use a three-stage heating method to raise the temperature with the furnace to 400°C, keep the temperature for 15 minutes, raise the temperature to 700°C at a heating rate of 5°C / min, keep the temperature for 30 minutes, and continue to raise the temperature to 950°C at a heating rate of 5°C / min. ℃, hold for 30 minutes, cool with the furnace, cool the titanium alloy welded parts to below 200 ℃, and then air-cool the titanium alloy parts; test the tensile strength and elongation of the titanium alloy parts after heat treatment.

Example Embodiment

[0030] Example 2

[0031] After cleaning the surface of the titanium alloy with acetone solution, the workpieces to be welded are assembled and fixed and put into the vacuum heat treatment furnace. The vacuum working pressure in the vacuum chamber is 5.5×10 -2 Pa, use a three-stage heating method to raise the temperature with the furnace to 400°C, keep the temperature for 15 minutes, raise the temperature to 700°C at a heating rate of 5°C / min, keep the temperature for 30 minutes, and continue to raise the temperature to 950°C at a heating rate of 5°C / min. ℃, hold for 30 minutes, cool with the furnace, cool the titanium alloy welded parts to below 200 ℃, and then air-cool the titanium alloy parts; test the tensile strength and elongation of the titanium alloy parts after heat treatment.

Example Embodiment

[0032] Example 3

[0033] After cleaning the surface of the titanium alloy with acetone solution, fix the workpiece to be welded and put it into the vacuum heat treatment furnace. The vacuum working pressure in the vacuum chamber is 5×10 -2 Pa, use a three-stage heating method to raise the temperature with the furnace to 450°C, keep the temperature for 15 minutes, raise the temperature to 700°C at a heating rate of 7°C / min, keep the temperature for 30 minutes, and continue to raise the temperature to 950°C at a heating rate of 7°C / min. ℃, hold for 30 minutes, cool with the furnace, cool the titanium alloy welded parts to below 200 ℃, and then air-cool the titanium alloy parts; test the tensile strength and elongation of the titanium alloy parts after heat treatment.

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Abstract

The invention discloses a welding process of a titanium alloy workpiece, which comprises the following steps: pre-treating the surface of a titanium alloy, combining and fixing with other workpieces to be welded, putting into a vacuum heat treatment furnace, heating to 900-950 DEG C along with the furnace in a three-section heating manner, preserving heat, and cooling along with the furnace to obtain the titanium alloy workpiece. The three-stage heating mode comprises the following steps: heating to 400-450 DEG C along with a furnace, preserving heat for 10-20 minutes, heating to 700-800 DEG C at a heating rate of 5-15 DEG C/min, preserving heat for 30-40 minutes, continuously heating to 900-950 DEG C at a heating rate of 5 DEG C/min, preserving heat for 30-40 minutes, and cooling along with the furnace. The titanium alloy workpiece has good tensile strength; the welding technology is simple and convenient, the production efficiency is high, meanwhile, alloy strength reduction caused by a traditional common annealing technology can be effectively avoided, and good application prospects are achieved.

Description

technical field [0001] The invention belongs to the technical field of alloy preparation, and particularly relates to a welding process for titanium alloy parts. Background technique [0002] Titanium alloys are alloys based on titanium with other elements added. Titanium and titanium alloys are a very important structural metal that emerged in the 1950s. Compared with other structural metals, it has a series of outstanding advantages. The first is that the specific gravity of titanium is small and the specific strength is high. The specific gravity of titanium is 4.5, which is between aluminum (2.7) and iron (7.6), but the specific strength is higher than that of aluminum and iron. The heat resistance of titanium alloys is also much higher than that of aluminum and magnesium alloys. For example, at 300°C to 350°C, the strength of titanium alloys is about one grade higher than that of aluminum and magnesium alloys, while at 400°C to 500°C, aluminum and magnesium alloys l...

Claims

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Application Information

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IPC IPC(8): C22F1/18C22F1/02
CPCC22F1/183C22F1/02
Inventor 尹立孟张可欣王刚姚宗湘张鹤鹤陈玉华方乃文
Owner CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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