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Research Papers: Heat Transfer in Manufacturing

Modeling of the Adsorption Kinetics and the Convection of Surfactants in a Weld Pool

[+] Author and Article Information
Minh Do-Quang

Linné Flow Centre, Department of Mechanics, Royal Institute of Technology, SE-811 81 Sandviken, Swedenminh@mech.kth.se

Gustav Amberg

Linné Flow Centre, Department of Mechanics, Royal Institute of Technology, SE-811 81 Sandviken, Swedengustava@mech.kth.se

Claes-Ove Pettersson

Research and Development Department, Sandvik Materials Technology, Swedenclaes-ove.pettersson@sandvik.com

J. Heat Transfer 130(9), 092102 (Jul 09, 2008) (11 pages) doi:10.1115/1.2946476 History: Received April 16, 2007; Revised March 03, 2008; Published July 09, 2008

This paper presents a comprehensive three-dimensional, time-dependent model for simulating the adsorption kinetics and the redistribution of surfactants at the surface and in the bulk of a weld pool. A physicochemical approach that was included in this paper allows the surfactant concentration at the surface and in the bulk to depart from its thermodynamical equilibrium. The Langmuir equilibrium adsorption ratio was based on the kseg coefficient of Sahoo (1988, “Surface-Tension of Binary Metal—Surface-Active Solute Systems Under Conditions Relevant to Welding Metallurgy  ,” Metall. Trans. B, 19B, pp. 483–491) and was finally used for calculating fluid flow and heat transfer in gas tungsten arc welding of a super duplex stainless steel, SAF 2507. In this study, the authors applied the multicomponent surfactant mass transfer model to investigate the effect of the influence of sulfur and oxygen redistribution in welding of a super duplex stainless steel.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Modeling multicomponent surfactant mass transfer in the weld pool

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Figure 2

The Langmuir equilibrium adsorption ratio of sulfur, kL,S

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Figure 3

The Langmuir equilibrium adsorption ratio of oxygen, kL,O

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Figure 4

An adaptive mesh

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Figure 5

The numerical and the experimental cross section of the weld pool. (A) Multicomponent model. (B) Sulfur redistribution model. (C) Experimental result. Welding conditions: Us=200mmmin−1, I=100A, U=10.2V, and η=65%.

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Figure 6

The evolution of the surface concentration with the moving speed of heat source Us=200mmmin−1

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Figure 7

The evolution of the surface concentration with the moving speed of heat source Us=200mmmin−1

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Figure 8

The numerical and experimental cross sections of the weld pool. (A) Multicomponent model. (B) Sulfur redistribution model. (C) Experimental result. Welding conditions: Us=100mmmin−1, I=100A, U=10.2V, and η=65%.

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Figure 9

The evolution of the surface concentration with the moving speed of heat source Us=100mmmin−1

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