7A52 aluminum alloy VPPA-MIG hybrid welding residual stress testing based on elastic modulus variation

被引：0
|
作者：
Gan S. [1 ,2 ]
Han Y. [1 ]
Chen F. [1 ]
Li X. [1 ]
机构：
[1] Materials Forming Key Laboratory, Inner Mongolia University of Technology, Hohhot
[2] College of Mechanical Engineering, Inner Mongolia University of Technology, Hohhot
来源：
Hanjie Xuebao/Transactions of the China Welding Institution | 2019年 / 40卷 / 05期
关键词：
Aluminum alloy; Elastic modulus; Residual stress; Variable polarity plasma arc-metal inert gas;
D O I：
10.12073/j.hjxb.2019400120
中图分类号：
学科分类号：
摘要：
A residual stress testing system based on hole-drilling method was designed by virtual instrument and NI data acquisition card to analyze the welding residual stress distribution for 7A52 aluminum alloyplates after the process of VPPA-MIG hybrid welding. To reduce the impact of elastic modulus error on the final measurement results, the elastic modulus is derived from curve that is fit to data measured in different hybrid welded joint areas. The experiment of VPPA-MIG welding residual stress measurement was carried out on 10 mm thick 7A52 aluminum alloy plates. The results show that the distribution of residual stresses on two sides of weld is basically symmetrical along the weld center. Maximum tensile stresses exist in the fusion zone, and the maximum transverse residual stress σy and the maximum longitudinal residual stress σx are 118 and 223 MPa, respectively. From fusion zone to heat affected zone, residual stresses are all tensile stresses, which become smaller gradually and are higher than the residual stresses in the weld center. Compared with the result of MIG welding, the maximum transverse residual stress and the maximum longitudinal residual stress of VPPA-MIG hybrid welding are higher, but the high-stress area of VPPA-MIG hybrid welding are narrower. © 2019, Editorial Board of Transactions of the China Welding Institution, Magazine Agency Welding. All right reserved.
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页码：13 / 17and23
页数：1710
相关论文
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