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Author:

Wang, Y. (Wang, Y..) | Li, H. (Li, H..) | Li, Z. (Li, Z..) | Zhang, Y. (Zhang, Y..) | Qin, J. (Qin, J..) | Chen, G. (Chen, G..) | Qi, B. (Qi, B..) | Zeng, C. (Zeng, C..) | Cong, B. (Cong, B..)

Indexed by:

EI Scopus SCIE

Abstract:

The increasing demand for achieving high-efficiency and high-quality medium-thick aluminium alloy welded structures, especially for large scale aerospace components, presents an urgent challenge to the conventional TIG arc welding process. This work proposed a novel double-pulsed variable polarity tungsten inert gas (DP-VPTIG) arc, in which the variable polarity square wave current was simultaneously modulated into ultrasonic frequency (20–80 kHz) and low frequency (0.5–10 Hz) pulses. Full penetration welds of 6 mm thick AA2219 aluminum alloy were successfully obtained by using this process. The microstructure and mechanical properties of the weld produced by DP-VPTIG arc were investigated, taking the conventional VPTIG arc as a comparative study. Results show that the microstructure of weld zone by DP-VPTIG arc showed an alternating distribution of fine equiaxed grain band and slightly coarse equiaxed grain band. Compared to VPTIG arc, the grain structure was effectively refined in the weld zone with DP-VPTIG arc, showing a significant reduction of average grain size by 51.2% along transverse section and 61.3% along longitudinal section. The morphology of α-Al+θ-CuAl2 eutectics transformed from continuously distributed netlike shape to separately distributed granular shape, and segregation of Cu solute element was obviously improved. The average microhardness of weld zone was increased by about 8.7% and 5.6% along transverse section and along longitudinal section. The tensile properties of ultimate tensile strength, yield strength and elongation were increased by 6.6%, 10.6% and 20.5%, respectively. The results provide a valuable basis for improving welding efficiency and joint quality through a hybrid pulsed arc. © 2023 The Authors

Keyword:

Microstructure Tungsten inert gas welding Mechanical property Aluminum alloy Double pulse

Author Community:

  • [ 1 ] [Wang Y.]Department of Materials Science and Engineering, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing, 100124, China
  • [ 2 ] [Li H.]Department of Materials Science and Engineering, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing, 100124, China
  • [ 3 ] [Li Z.]Department of Materials Science and Engineering, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing, 100124, China
  • [ 4 ] [Zhang Y.]Department of Materials Science and Engineering, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing, 100124, China
  • [ 5 ] [Qin J.]Welding Engineering and Laser Processing Centre, Cranfield University, Cranfield, United Kingdom
  • [ 6 ] [Chen G.]Welding Engineering and Laser Processing Centre, Cranfield University, Cranfield, United Kingdom
  • [ 7 ] [Qi B.]School of Mechanical Engineering and Automation, Beihang University, Beijing, 100191, China
  • [ 8 ] [Zeng C.]School of Mechanical Engineering and Automation, Beihang University, Beijing, 100191, China
  • [ 9 ] [Cong B.]School of Mechanical Engineering and Automation, Beihang University, Beijing, 100191, China

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Source :

Journal of Materials Research and Technology

ISSN: 2238-7854

Year: 2023

Volume: 23

Page: 3048-3061

6 . 4 0 0

JCR@2022

Cited Count:

WoS CC Cited Count: 0

SCOPUS Cited Count: 18

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 4

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