Inclusion characteristics are extremely important factors which affect the weld metal microstructure. Estimation of the inclusion characteristics in low alloy steel weld metals was attempted using thermodynamic calculation. Reasonable quantitative agreement is found between the calculated results and experimental observations in the literature, indicating that the present approach is useful for controlling inclusions in weld metals and optimising weld chemistry. It is also suggested that thermodynamic phase stability exerts a significant influence on the inclusions in low alloy steel weld metals.
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