Journal
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART B-JOURNAL OF ENGINEERING MANUFACTURE
Volume 222, Issue 11, Pages 1315-1324Publisher
SAGE PUBLICATIONS LTD
DOI: 10.1243/09544054JEM944
Keywords
CO2 laser welding; gas metal arc welding (GMAW); hybrid welding; laser-induced plasma; shielding gas
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In carbon dioxide (CO2) laser-gas metal arc hybrid welding, a shielding gas is supplied to isolate the molten metal from the ambient air, suppress the laser-induced plasma, remove the plume out of the keyhole, and stabilize the metal transfer. In this study, a shielding gas consisting of helium, argon, and CO2 was used, and its effects on the composition of the welding phenomena, such as behaviours of laser-induced plasma generation, molten pool flow, and droplet transfer in gas metal arc welding, were investigated. High-speed video observation was used to investigate the welding phenomena inside the arc regime. Consequently, helium was found to have a dominant role in suppressing laser-induced plasma; minimum helium content at a laser power of 8 kW was suggested for laser autogenous and hybrid welding. Argon and CO2 govern the droplet transfer and arc stability. A 1.2 per cent addition Of CO2 stabilizes the metal transfer and eliminates undercut caused by insufficient wetting of molten metal.
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