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A COMPUTATIONAL FLUID DYNAMICS ANALYSIS OF TRANSPORT ENFORCED BY MARANGONI EFFECT DURING LASER WELDING

ALEKSANDER SIWEK



Abstract: The presence of surface active elements such as sulfur in steel, changes the surface tension on the weld pool surface. The Marangoni effect induced by temperature dependent surface tension gradient, determines the direction of fluid flow in the entire volume of the weld pool. The difference of initial sulfur concentration of the welded parts is an additional factor which complicates the model. During welding an additional body force source term has been added to the momentum equations at the liquid steel surface, depending on sulfur concentration gradient. Mutual mixing of welded steels in the weld pool leads to periodic changes of driving force direction. The model permits the calculation of sulfur concentration in the weld pool and weld size depending on the initial composition, laser power and welding velocity.

Key words: CFD, dissimilar welding, surface active element


 
GENERAL INFORMATION

Title of Journal:
Computer Methods in Materials Science QUARTERLY

Title of Journal in Polish:
Informatyka w Technologii Materiałów KWARTALNIK

ISSN: 1641-8581
Publishing House: AKAPIT
Current issue: Vol. 17, 2017, No. 4
 
 
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