Weld pool development during GTA and laser beam welding of type 304 stainless steel Part I. Theoretical analysis

T. Zacharia, S. A. David, J. M. Vitek, Tarasankar Debroy

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Abstract

A computational and experimental study was carried out to quantitatively understand the influence of the heat flow and the fluid flow in the transient development of the weld pool during gas tungsten arc (GTA) and laser beam welding of Type 304 stainless steel. Stationary gas tungsten arc and laser beam welds were made on two heats of Type 304 austenitic stainless steels containing 90 ppm sulfur and 240 ppm sulfur. A transient heat transfer model was utilized to simulate the heat flow and fluid flow in the weld pool. The current investigation differs from earlier modeling studies which assumed a constant temperature coefficient of surface tension dγ/dT at the weld pool surface independent of both the local temperatures and the concentration of surface active elements such as sulfur. In the present investigation, dγ/dT was calculated as a function of temperature and sulfur content. This allows for a realistic simulation of the effect of the concentration of surface active elements on the fluid flow and weld geometry.

Original languageEnglish (US)
JournalWelding Journal
Volume68
Issue number12
StatePublished - Dec 1989

All Science Journal Classification (ASJC) codes

  • Metals and Alloys

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