Investigation of the Difference in the Pulse Current in the Double Pulsed Gas Metal Arc Welding of Aluminum Alloys

Li Jin; Yuqing Yang; Ping Yao; Wenshi Chen; Zhiqiu Qian; Jiaxiang Xue

doi:10.3390/ma15072513

Investigation of the Difference in the Pulse Current in the Double Pulsed Gas Metal Arc Welding of Aluminum Alloys

Materials (Basel). 2022 Mar 29;15(7):2513. doi: 10.3390/ma15072513.

Authors

Li Jin¹, Yuqing Yang¹, Ping Yao², Wenshi Chen¹, Zhiqiu Qian¹, Jiaxiang Xue³

Affiliations

¹ School of Mechatronics Engineering, Guizhou Minzu University, Guiyang 550025, China.
² College of Electromechanical Engineering, Guangdong Polytechnic Normal University, Guangzhou 510635, China.
³ School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510650, China.

Abstract

In this paper, a double pulse gas metal arc welding (DP-GMAW) for an AA6061-T6 aluminum alloy based on fewer basic welding parameters than the traditional DP-GMAW is proposed. This study compared the difference in pulse base currents (ΔIb) and the difference in the pulse peak currents (ΔIp) by analyzing the electrical signal and morphology properties of welded samples. The results indicated that changing ΔIp caused welding defects or even welding failure easily. The welding stability after changing ΔIb was much better than that after changing ΔIp. The individual fish-scale width of the weld joint remained unchanged when ΔIb was at different values. In addition, the average absorbed work, tensile strength, yield strength and elongation of the weld joints obtained by different ΔIb values reached 31.1%, 60.2%, 52.9% and 37.9% of the base metal, respectively.

Keywords: DP-GMAW; aluminum alloy; basic welding parameters; current waveform; mechanical properties; pores; welding stability.