中國有色金屬學報(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 29 No. 6 June 2019 |
（1. Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China;
2. Key Laboratory for Advanced Materials Processing Technology, Ministry of Education, Tsinghua University, Beijing 100084, China;
3. China Academy of Launch Vehicle Technology, Beijing 100076, China;
4. State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China;
5. Tianjin Long March Launch Vehicle Manufacturing Co., Ltd., Tianjin 300462, China;
6. Capital Aerospace Machinery Corporation Limited, Beijing 100076, China）
Abstract:Numerical simulation and experimental methods were used to investigate the effects of weld penetration on tensile properties of 2219 aluminum alloy tungsten inert gas (TIG) welded joints. The results show that when other geometric parameters are consistent, within a certain range, the deeper the weld penetration of the capping weld is, the lower the tensile strength of the joint is. The deeper weld penetration of the capping weld can cause the more concentrated stress at the weld toe and the joint is more likely to crack accordingly. Based on necessary assumptions, a model for analyzing the mathematical relation between the weld penetration of the capping weld and the tensile strength of the joint was proposed to validate the experimental results. The decrease of weld penetration of capping weld can be controlled by decreasing welding current, helium content or increasing welding voltage.
Key words: 2219-C10S aluminum alloy; weld penetration; tensile strength; numerical simulation; correlation
