Models for assessment and prediction of the hardness of the heat affected zone in aluminum weldment cooled in groundnut oil in relation to similarly cooled mild steel and cast iron weldments

Abstract

Models have been derived for assessing and predicting the heat affected zone hardness of aluminum weldment cooled in groundnut oil in relation to the respective and combined values of HAZ hardness of mild steel and cast iron welded and cooled under the same conditions have been derived. The derived single models; β = 0.4478γ, β = 0.8031α, and γ = 1.7934α as well as general model; β = 1.2509[(γα/γ + α)] were found to predict the HAZ hardness of aluminum weldment cooled in groundnut oil as a function of the HAZ hardness of mild steel or cast iron welded and cooled under the same conditions. The maximum deviation of the model-predicted HAZ hardness values β, γ and α from the corresponding experimental values βexp, γexp and αexp was less 0.02% indicating the reliability and validity of the model.