Journal
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART B-JOURNAL OF ENGINEERING MANUFACTURE
Volume 223, Issue 6, Pages 751-757Publisher
SAGE PUBLICATIONS LTD
DOI: 10.1243/09544054JEM1369SC
Keywords
high-speed welding; weld-bead defects; double-electrode gas metal arc welding (DE-GMAW); critical welding speed
Funding
- National Science Foundation of China [50675119]
- Specialized Research Fund for the Doctoral Programme of Higher Education in China [20050422027]
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It is of great practical significance to improve welding production efficiency by modifying conventional gas metal arc welding (GMAW) and increasing welding speed. In this study, an experimental system was developed to implement double-electrode gas metal arc welding (DE-GMAW) and to conduct high-speed arc welding experiments. The geometric parameters for assembling two welding torches were optimized according to the weld-bead quality in DE-GMAW experiments. Based on the measured values of the wire Current 1, base metal current I-bm, and bypass Current their relationship, i.e. I is the SUM of I-bm, and I-bp, was validated, and the scheme of DE-GMAW was realized. By means of adjusting the relative levels of the three current components, weld-bead defects such as humping and/or undercut occurring in high-speed welding can be suppressed and good weld-bead formation call be achieved. Compared with conventional GMAW, DE-GMAW can be operated at much higher welding speed without weld-bead defects occurring. The critical welding speed in DE-GMAW is increased by 28.3-80.0 per cent under the conditions employed in the experiments.
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