Acta Metallurgica Sinica (English Letters) ›› 2013, Vol. 26 ›› Issue (3): 352-360.DOI: 10.1007/s40195-012-0166-5

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Numerical Analysis of Welding Residual Stress and Distortion in Laser+GMAW Hybrid Welding of Aluminum Alloy T-Joint

Guoxiang XU1), Chuansong WU2), Xuezhou MA1), Xuyou WANG3)   

  1. 1) Key Laboratory of Advanced Welding Technology of Jiangsu Province, Jiangsu Univeristy of Science and Technology, Zhenjiang 212003, China
    2) Institute of Advanced Welding Technology, Shandong University,Jinan 250061, China
    3) Harbin Welding Institute,China Academy of Machinery Science & Technology, Harbin 150080,China
  • Received:2012-09-19 Revised:2013-01-23 Online:2013-06-25 Published:2013-05-06
  • Contact: Guoxiang XU
  • Supported by:

    Sino-Russian Cooperation Research Project of China (No. 2009DFR50170), the National Natural Science Foundation of China (No. 51105182) and the College Natural Science Foundation of Jiangsu Province (No. 11KJB460004).

Abstract:

A 3-D finite element model is developed to predict the temperature field and thermally induced residual stress and distortion in laser+GMAW hybrid welding of 6061-T6 aluminum alloy T-joint. And the characteristics of residual stress distribution and deformation are numerically investigated. In the simulation, the heat source model takes into account the effect of joint geometric shape and welding torch slant on the heat flux distribution and a sequentially coupled thermo-mechanical method is used. The calculated results show that higher residual stress is distributed in and surround the weld zone. Its peak value is very close to the yield strength of base metal. Besides, a large deformation appears in the middle and rear part of the weldment.

Key words: Hybrid welding, Residual stress, Welding distortion, Aluminum alloy T-joint, Numerical simulation