Arc characteristic evaluation of the double-electrode GTAW process using high current values
- 74 Downloads
This work presents new research results from double-electrode gas tungsten arc welding, a process variant that was developed with the aim of improving productivity and welding speed. A welding torch specially constructed for research was used with total current in the range of 200–600 A. Tests using a high-speed camera were conducted in order to characterize the arc morphology at different distances between the electrodes. It could be seen that the morphology of the arc and the voltage drop in each electrode change significantly with the increase in the welding speed, especially when there is a larger clearance distance between electrodes. The resulting arc presented bigger asymmetry as the welding speed was increased. Bead-on-plate tests were performed in order to evaluate their susceptibility to humping defects. The results showed that in comparison with the conventional GTAW, the double-electrode process enables a considerable increase in the maximum speed, without defects—taking into consideration the total applied current. This shows that this new process has great potential for expanding the range of gas tungsten arc welding in high-productivity welding applications.
KeywordsArc pressure Humping High-efficiency welding High welding current Arc morphology
Unable to display preview. Download preview PDF.
The authors gratefully acknowledge the financial support (scholarship) of CAPES (Brazilian Federal Agency for Support and Evaluation of Graduate Education) and the CNPq (National Council of Technological and Scientific Development).
- 2.Welding handbook (2004) Welding processes, part 1, vol 2, 9th edn. American Welding Society, Miami, p 117 ISBN: 0-87171-729-8Google Scholar
- 3.Shinozaki K, Yamamoto M, Mitsuhata K, Nagashima T, Kanazawa T, Arashin H (2011) Bead formation and wire temperature distribution during ultra-high-speed GTA welding using pulse-heated hot-wire. Weld World 55(04):12–18Google Scholar
- 4.Savage WF, Nippes EF, Agusa K (1979) Effect of arc force on defect formation in GTA welding. Weld J:212s–224sGoogle Scholar
- 5.Mendez PF, Eagar TW (2003) Penetration and defect formation in high-current arc welding. Weld J:296–306Google Scholar
- 6.Kumar A, Debroy T (2006) Toward a unified model to prevent humping defects in gas tungsten arc welding. Weld J:292–304Google Scholar
- 14.Ogino Y, Hirata Y, Kawata J, Nomura K (2013) Numerical analysis of arc plasma and weld pool formation by a tandem TIG arc. Weld World 57:411–423Google Scholar
- 19.Schwedersky MB, Dutra JC, G RH, e Silva U, Reisgen KW (2015) Double-electrode process speeds GTAW. Weld J:64–67Google Scholar
- 22.Polysoude – TIGer brochure, Accessed 14 June 2014. http://fr.polysoude.com/images/stories/documents/french/technical/DOC_Broch_TIGer-technology_FR.pdf