Method of soldering titanium alloy thin-walled parts with Ti-Cu-Ni-Zr solder

A technology of ti-cu-ni-zr and thin-walled parts is applied in the field of brazing titanium alloy thin-walled parts with Ti-Cu-Ni-Zr filler metal, which can solve the problems of brittleness and low penetration rate of joints, and achieve Solve the effect of high weight, high penetration rate and high quality connection

Active Publication Date: 2014-04-30
HARBIN DONGAN ENGINE GRP
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AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method of using Ti-Cu-Ni-Zr solder to braze titanium alloy thin-walled parts, which can meet the requirements of welding and solve the problems of low penetration rate and brittleness of joints

Method used

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Examples

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Embodiment 1

[0028] For the welding of an engine blade and ring, both the blade and the ring are thin-walled parts, the thickness of the blade is 0.8mm, and the thickness of the ring is 0.8mm. After welding, the penetration rate is required to be more than 85%. The welding steps are as follows:

[0029] 1) Chemically clean the parts before brazing to completely remove the oxide film and oil. The chemical cleaning is as follows: use HNO with a composition of d=1.36 in the pickling tank 3 285ml / L, d=1.13 HF27ml / L, the rest is pickling with deionized water mixture; the temperature is room temperature, the time is 3min, after pickling, immediately wash with water at room temperature for 2min

[0030] 2) Within 4 hours, dehydrogenate titanium alloy thin-walled parts and titanium alloy specimens together to prevent hydrogen from interacting with titanium to form TiH 2 brittle phase, and then put the part into a clean container; the dehydrogenation method is: carry out in a vacuum furnace at a te...

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Abstract

The invention relates to a method of soldering titanium alloy thin-walled parts with Ti-Cu-Ni-Zr solder. The Ti-Cu-Ni-Zr solder is utilized, soldering temperature and temperature holding time are controlled, joint structure and shear strength are controlled accordingly, titanium alloy thin-walled parts are connected successfully, a high-strength high-penetration joint is obtained, shear strength of the joint reaches 557MPa-597MPa, and penetration rate reaches more than 95%. The titanium alloy thin-walled parts are successfully connected with the Ti-Cu-Ni-Zr solder, the joint is applied to airspace engines to connect the titanium alloy thin-walled parts with high strength and high quality, and the problem that cold end parts in the airspace engines are generally high in weight and poor in corrosion resistance is solved.

Description

technical field [0001] The invention relates to a method for brazing titanium alloy thin-wall parts by using Ti-based solder. Background technique [0002] Titanium alloys have low density and light weight and are increasingly used in aerospace and other industries. Titanium alloy has a small coefficient of thermal expansion, low thermal conductivity, and low strength, but it has good plasticity, good machinability and corrosion resistance, and can be processed under normal pressure. Due to the above-mentioned excellent properties of titanium alloy, titanium alloy materials are used to process structural parts for aero-engines, such as fan casings and stator rings of aero-engines. The thickness of these parts is between 0.6mm and 1.0mm, and the base material is mainly It is an α + β titanium alloy. However, for the welding of titanium alloy materials, especially thin-walled parts, intermetallic compounds will generally be formed after welding, causing joint brittleness and...

Claims

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Application Information

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IPC IPC(8): B23K1/008B23K1/20B23K1/14B23K35/30B23K35/22B23K103/14
CPCB23K1/008B23K1/14B23K1/20B23K1/206B23K33/004B23K35/325B23K2103/14
Inventor 郑医王广海师玉英宋健兰宇王振明陈玉宝
Owner HARBIN DONGAN ENGINE GRP
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