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VACUUM ›› 2020, Vol. 57 ›› Issue (4): 89-94.doi: 10.13385/j.cnki.vacuum.2020.04.18

• 3D Printing Technology • Previous Articles     Next Articles

Research on Microstructure and Mechanical Properties of Laser Butt Welding of Thin TC4 Titanium Alloy

ZHAO Xing-wang, LIU Yan-mei, FU He-guo, SHI Ji-peng, GUAN Feng   

  1. Avic Shenyang Aircraft Corporation, Shenyang 110013, China
  • Received:2020-02-25 Online:2020-07-25 Published:2020-07-23

Abstract: Aiming at the characteristics of the complex mechanical in actual environment of aviation titanium alloy structural parts, the most widely used laser welding of 1.0mm and 2.0mm TC4 thin-walled titanium alloy were taken as the research object in this paper. From the perspective of welding process, the welding process parameters were optimized, the shear performance were tested, as well as tensile performance and bending performance of the joint. In order to further analyze the as-measured mechanical performance results, X-ray and SEM were used to observe the internal quality and microstructure. The results show that laser welding joints with good performance can be obtained using the optimized process parameters, and all indicators of the joint meet the requirements of aviation standard level Ⅰ. This is mainly due to the large temperature gradient and fast cooling speed of the laser welding molten pool, the joint microstructure is mainly composed of tiny needle-shaped martensite distributed in a basket shape that improves the plasticity of the joint and the high temperature endurance strength.

Key words: TC4, lasew welding, microstructure, mechanical properties

CLC Number: 

  • TG457
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