Modeling of the Weld Shape Development During the Autogenous Welding Process by Coupling Welding Arc with Weld Pool |
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Authors: | Wenchao Dong Shanping Lu Dianzhong Li Yiyi Li |
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Affiliation: | (1) Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang, 110016, China |
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Abstract: | A numerical model of the welding arc is coupled to a model for the heat transfer and fluid flow in the weld pool of a SUS304
stainless steel during a moving GTA welding process. The described model avoids the use of the assumption of the empirical
Gaussian boundary conditions, and at the same time, provides reliable boundary conditions to analyze the weld pool. Based
on the two-dimensional axisymmetric numerical modeling of the argon arc, the heat flux to workpiece, the input current density,
and the plasma drag stress are obtained. The arc temperature contours, the distributions of heat flux, and current density
at the anode are in fair agreement with the reported experimental results. Numerical simulation and experimental studies to
the weld pool development are carried out for a moving GTA welding on SUS304 stainless steel with different oxygen content
from 30 to 220 ppm. The calculated result show that the oxygen can change the Marangoni convection from outward to inward
direction on the liquid pool surface and make the wide shallow weld shape become narrow deep one. The calculated result for
the weld shape and weld D/W ratio agrees well with the experimental one. |
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Keywords: | |
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