Investigation of Transport Phenomena in Three-Dimensional Gas Metal Arc Welding of Thick Metals
Arc welding is generally used to join thick metals in many engineering applications. However, poor penetration often occurs due to arc heat diffusion into the base metal. Hence, arc welding of thick metals normally requires grooving and/or preheating of the base metal and sometimes requires multiple passes for very thick metals or metals with high conductivity, such as aluminum alloys. In gas metal arc welding of thick metals with grooves and preheating, complicated melt flow and heat transfer are caused by the combined effect of droplet impingement, gravity, electromagnetic force, surface tension, and plasma arc pressure. Understanding these complicated transport phenomena involved in the welding process is critical in improving the penetration depth and weld quality. In this study, mathematical models and associated numerical techniques have been developed to study the effects of grooves and preheating on melt flow, diffusion of species, and weld penetration in gas metal arc welding of thick metals. Complex melt flow, transient weld pool shape and distributions of temperature and species in the weld pool are calculated. The continuum formation is adopted to handle liquid region, mushy zone and solid region. VOF technique is used to handle transient deformed shape of weld pool surface. The preliminary results show both grooves and preheating have important effects on the melt flow in weld pool and the weld penetration. Computer animations showing the evolutions of temperature; melt flow; and the interaction between droplets and weld pool will be presented. Copyright © 2007 by ASME.
J. Zhou et al., "Investigation of Transport Phenomena in Three-Dimensional Gas Metal Arc Welding of Thick Metals," 2007 Proceedings of the ASME/JSME Thermal Engineering Summer Heat Transfer Conference - HT 2007, American Society of Mechanical Engineers (ASME), Jan 2007.
The definitive version is available at http://dx.doi.org/10.1115/HT2007-32686
2007 ASME/JSME Thermal Engineering Summer Heat Transfer Conference, HT 2007
Mechanical and Aerospace Engineering
ASME, Heat Transfer Division
Japanese Society of Mechanical Engineers (JSME)
Article - Conference proceedings
© 2007 American Society of Mechanical Engineers (ASME), All rights reserved.