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Modeling of the Weld Shape Development During the Autogenous Welding Process by Coupling Welding Arc with Weld Pool

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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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Acknowledgments

The authors are grateful for the financial support from the National Science Foundation of China (NSFC) under Grant No. 50874101 and the Science Program of Shenyang City under Grant No. 1071275-0-02.

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Authors and Affiliations

  1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang, 110016, China

    Wenchao Dong, Shanping Lu, Dianzhong Li & Yiyi Li

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  1. Wenchao Dong
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  2. Shanping Lu
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Correspondence to Shanping Lu.

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Dong, W., Lu, S., Li, D. et al. Modeling of the Weld Shape Development During the Autogenous Welding Process by Coupling Welding Arc with Weld Pool. J. of Materi Eng and Perform 19, 942–950 (2010). https://doi.org/10.1007/s11665-009-9570-z

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  • DOI: https://doi.org/10.1007/s11665-009-9570-z

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