NDLI: Influence of driving forces on weld pool dynamics in GTA and laser welding

Content Provider	Springer Nature Link
Author	Cho, Won Ik Na, Suck Joo Han, Sang Woo Kim, Cheol Hee
Copyright Year	2012
Abstract	There are several driving forces such as surface tension, buoyancy force, arc pressure, electromagnetic force, recoil pressure, drag force, etc. in gas tungsten arc (GTA) welding and laser welding, which have different influences on flow dynamics in the weld pool.This paper investigates the influence of respective driving forces on weld pool dynamics by using mathematical models and numerical simulations. In numerical simulations, the flow patterns in the weld pool and the maximum fluid velocity caused by respective driving forces can be observed, since driving forces can be applied separately.As all driving forces are applied under experimental conditions, the results of experiments and numerical simulations were compared to validate the numerical simulations and mathematical models used in this paper. In GTA welding, Marangoni flow can be considered as the most dominant force in the radial direction, while the velocity magnitudes of the z-axis direction of all respective forces except buoyancy and drag force are almost the same. The influence of buoyancy force is negligible. In keyhole laser welding, however, recoil pressure can be considered the dominant force, while the other driving forces have only a negligible influence on fluid dynamics in deep keyhole welding. In laser–GTA hybrid welding, recoil pressure can be considered the dominant force.
Starting Page	257
Ending Page	264
Page Count	8
File Format	PDF
ISSN	00432288
Journal	Welding in the World
Volume Number	57
Issue Number	2
e-ISSN	18786669
Language	English
Publisher	Springer-Verlag
Publisher Date	2013-01-08
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Metallic Materials Theoretical and Applied Mechanics Continuum Mechanics and Mechanics of Materials
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Metals and Alloys Mechanical Engineering

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