Alternating current-gas metal arc welding for application to thick plates

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An alternating current (AC)-gas metal arc welding (GMAW) process with an improved current waveform is proposed. In this process, an increase in the welding current and electrode negative (EN) ratio resulted in finger-like penetration. Concentrated heat input was observed at the center of the weld pool at high current, and this input increased with the EN ratio. The lack of fusion at the joint side walls, which was observed for plates thicker than 5 mm, can be overcome by rapid pre-heating of the joint sides through induction heating. The effectiveness of using the AC-GMAW process under the strong magnetic fields of induction heating was evaluated in comparison with the pulsed-GMAW process. The proposed approach, by utilizing the benefits of a higher material deposition rate and controlled heat input, can be used to apply the AC-GMAW process to workpieces of greater thickness.
Publisher
ELSEVIER SCIENCE SA
Issue Date
2015-08
Language
English
Article Type
Article
Citation

JOURNAL OF MATERIALS PROCESSING TECHNOLOGY, v.222, pp.75 - 83

ISSN
0924-0136
DOI
10.1016/j.jmatprotec.2015.02.041
URI
http://hdl.handle.net/10203/199077
Appears in Collection
ME-Journal Papers(저널논문)
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