A numerical analysis of molten pool convection considering geometric parameters of cathode and anode

Cited 5 time in webofscience Cited 0 time in scopus
  • Hit : 256
  • Download : 0
The heat transfer and fluid flow in the molten pool during stationary gas tungsten are welding (GTAW) using Ar shielding gas have been studied with an emphasis on the impact of geometric parameters on the welding are, such as electrode bevel angle, are length and surface depression due to are pressure acting on the molten pool surface. Driving forces responsible for weld pool convection, i.e., self-induced electromagnetic force, surface tension due to the temperature gradient at the surface of the molten pool and shear stress acting on the molten pool surface by the are plasma flow, were considered. The numerical model was applied to type 304L stainless steel plate with 30 ppm sulfur. As the welding current increased, the discrepancy of penetration at the weld center between the calculation and experiment increased because of the strong flow along the molten pool surface. As the electrode bevel angle decreased, the shear stress acting on the molten pool surface increased. Therefore, the fusion width increased and the fusion depth decreased. Changing the arc length did not influence the fusion shape because variation in shear stress, which determined the surface flow along the molten pool surface, was minor. From the simulation, considering the depression of the molten pool surface, the effects of the increased are length and elevated anode temperature resulted in a more accurate fusion width.
Publisher
AMER WELDING SOC
Issue Date
1997-11
Language
English
Article Type
Article
Keywords

FUSION ZONE GEOMETRY; GTA WELD SHAPE; FLUID-FLOW

Citation

WELDING JOURNAL, v.76, no.11, pp.S484 - S497

ISSN
0043-2296
URI
http://hdl.handle.net/10203/76783
Appears in Collection
ME-Journal Papers(저널논문)
Files in This Item
There are no files associated with this item.
This item is cited by other documents in WoS
⊙ Detail Information in WoSⓡ Click to see webofscience_button
⊙ Cited 5 items in WoS Click to see citing articles in records_button

qr_code

  • mendeley

    citeulike


rss_1.0 rss_2.0 atom_1.0