Author： Hong T. Debroy T. Babu S. David S.
Publisher： Springer Publishing Company
ISSN： 1543-1916
Source： Metallurgical and Materials Transactions B, Vol.31, Iss.1, 2000-02, pp. : 161-169
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Abstract
The composition, size distribution, and number density of oxide inclusions in weld metal are critical factors in determining weldment properties. A computational model has been developed to understand these factors, considering fluid flow and the temperature field in the weld pool during submerged are (SA) welding of low-alloy steels. The equations of conservation of mass, momentum, and energy are solved in three dimensions to calculate the velocity and temperature fields in the weld pool. The loci and corresponding thermal cycles of thousands of oxide inclusions are numerically calculated in the weld pool. The inclusions undergo considerable recirculatory motion and experience strong temperature gyrations. The temperature-time history and the computed time-temperature-transformation (TTT) behavior of inclusions were then used to understand the growth and dissolution of oxide inclusions in the weld pool. The statistically meaningful characteristics of inclusion behavior in the weld pool, such as the residence time, number of temperature peaks,
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