NDLI: Double-Pulse Triple-Wire MIG Welding of 6082-T6 Aluminum Alloy: Process Characteristics and Joint Performances

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Double-Pulse Triple-Wire MIG Welding of 6082-T6 Aluminum Alloy: Process Characteristics and Joint Performances

Content Provider	MDPI
Author	Yang, Ke Wang, Fei Liu, Hongbing Wang, Peng Luo, Chuanguang Yu, Zhishui Yang, Lijun Li, Huan
Copyright Year	2021
Description	High-efficiency and high-quality welding has always been the focus of welding research. This article proposes a novel double-pulse, triple-wire MIG welding process for the welding of 6082-T6 aluminum alloy. The process characteristics of welding arc and droplet transfer were studied, and the performances of weld formation, morphology, hardness, and tensile strength were tested for the 1 Hz, 3 Hz, and 5 Hz double-pulse welding and normal-pulse welding. It was found that in the welding process, the pulsed arc steadily alternated among three welding wires without arc interruption, and the arc length changed periodically with the double-pulse frequency. The droplets transferred with a stable one-pulse-one-drop mode. Besides, a proper double-pulse frequency, e.g., 3 Hz in this case, was conducive to forming good welds with regular fish-scale patterns and no pores. The tensile strength of the joint could reach 64% of the base material’s tensile strength, and its fracture belonged to plastic fracture, which occurred in the HAZ. This new welding method will have great potential in aluminum alloy welding.
Starting Page	1388
e-ISSN	20754701
DOI	10.3390/met11091388
Journal	Metals
Issue Number	9
Volume Number	11
Language	English
Publisher	MDPI
Publisher Date	2021-08-31
Access Restriction	Open
Subject Keyword	Metals Manufacturing Engineering Double-pulse Welding Triple-wire Welding 6082 Aluminum Alloy Welding Arc Droplet Transfer Joint Performance
Content Type	Text
Resource Type	Article

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