Welding parameters optimization and mechanical properties analysis of PVPPA welded high-strength aluminum alloy

被引：0
|
作者：
Li G. [1 ,2 ]
Liang Y. [1 ,2 ]
Chen F. [1 ,2 ]
Han Y. [1 ,2 ]
机构：
[1] Inner Mongolia University of Technology, Hohhot
[2] Inner Mongolia Key Laboratory of Light Metal Materials, Hohhot
来源：
Hanjie Xuebao/Transactions of the China Welding Institution | 2019年 / 40卷 / 10期
关键词：
7075 aluminum alloy; Mechanical property; PVPPA; Welding parameters;
D O I：
10.12073/j.hjxb.2019400268
中图分类号：
学科分类号：
摘要：
The welding process of 7075 aluminum alloy with a thickness of 10mm was carried out by PVPPAW. The influence of welding current and plasma gas flow rate on weld forming coefficient was studied. The optimum welding parameters were determined and the well-formed welds were obtained. The mechanical properties of the well-formed welded joints were analyzed. The results shown that the weld forming coefficient initially decreased and then increased with the increase of welding current. While the plasma gas flow rate increased, the weld forming coefficient gradually decreased. The better weld forming coefficient range is 1.1 ~ 1.3. Compared with the plasma gas flow rate, the welding current has greater influence on weld formation. The satisfying weld appearance can be achieved under the pulse welding current of 250 A/290 A, the plasma gas flow rate of 2.0 L/min. The welding quality is good under the optimum welding parameters, and the tensile strength of the weld reached 397.9 MPa, which is nearly 67.5% of that of the base metal. The weld area exhibited the dendrite microstructure. © 2019, Editorial Board of Transactions of the China Welding Institution, Magazine Agency Welding. All right reserved.
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页码：86 / 92
页数：6
相关论文
共 11 条
  • [1] Chen D., Li Z., Dai M., Et al., Microstructure and properties of 7075 high strength Al-alloy pulsed MIG welding joints, Journal of Netshape Forming Engineering, 9, 6, pp. 170-174, (2017)
  • [2] Liu C., Liu Z., Ruan X., Et al., Effect of post-weld heat treatment on microstructure and mechanical properties of welded joint of 7075 aluminum alloy by double-pulsed metal inert-gas welding process, Transactions of the China Welding Institution, 37, 10, pp. 81-84, (2016)
  • [3] Li G., Chen F., Han Y., Et al., Improving mechanical properties of PVPPA welded joints of 7075 aluminum alloy by PWHT, Materials, 11, 3, (2018)
  • [4] Liu C., Northwood D.O., Bhole S.D., Tensile fracture behavior in CO<sub>2</sub> laser beam welds of 7075-T6 aluminum alloy, Material & Design, 25, 7, pp. 573-577, (2004)
  • [5] Chang L., Song X., Li H., Et al., Microstructure and mechanical properties of laser-MIG hybrid welded joint of 7075-T6 aluminum alloy, Hot Working Technology, 43, 9, pp. 25-28, (2014)
  • [6] Li D., Yang X., Cui L., Et al., Investigation of stationary shoulder friction stir welding of aluminum alloy 7075-T651, Journal of Materials Processing Technology, 222, pp. 391-398, (2015)
  • [7] Sun Z., Han Y., Zhang S., Et al., LB-VPPA hybrid welding heat source model for aluminum alloy, Journal of Mechanical Engineering, 52, 12, pp. 46-51, (2016)
  • [8] Nunes A.C., Bayless E.O., Variable polarity plasma arc welding on space shuttle external tank, Welding Journal, 63, 4, pp. 27-35, (1984)
  • [9] Ding C., Liu C., Optimization of double-pulsed MIG welding and mechanical vibration combined process of 7075 super-hard aluminum alloy, Hot Working Technology, 47, 9, (2018)
  • [10] Chun L., Han Y., Chen F., Et al., Pulse variable polarity plasma arc welding technology of aluminum alloy, Transactions of the China Welding Institution, 37, 1, pp. 29-32, (2016)
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