Heat Source Modeling of GMAW Considering Metal Transfer

Jung, Ki-Nam; Lee, Ji-Hye; Lee, Jae-Young; Yoo, Choong-Don

Journal of KWJS 2004;22(2):69-77.
Published online September 15, 2004.

[연구논문] 용적이행을 고려한 GMA 용접의 열원 모델링

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Heat Source Modeling of GMAW Considering Metal Transfer

Ki-Nam Jung, Ji-Hye Lee, Jae-Young Lee, Choong-Don Yoo

Abstract

The Gaussian heat source has been widely used to simulate the heat flux of the welding arc, and applied to calculating the temperature distribution of a workpiece. The conventional two-dimensional Gaussian heat source for the GMAW is modified in this work by decomposing the arc heat into heats of the cathode and metal transfer. The efficiency and effective arc radius of each heat source are determined analytically for the free-flight mode such as the globular and spray modes. The temperature distribution and weld geometry are calculated using the finite element method, and distribution of the drop heat is found to have significant effects on the penetration. The predicted results show good agreements with the available experimental results, especially with the penetration.