Implicit analysis of heat affected zone hardness (HAZH) of aluminum weldment as a function of HAZH of similarly cooled metals

This paper presents an implicit analysis of the heat affected zone hardness of aluminum weldment cooled in air as a function of the heat affected zone hardness of similarly cooled mild steel and cast iron weldments. This evaluation resulted to model derivation; β = 1.2279 (γα /(α + γ)). The empirical model predicted the heat affected zone hardness (HAZH) of the aluminium weldment as a function of the HAZH of similarly cooled rmild steel and cast iron weldments. The HAZHs of mild steel and cast iron were also respectively predicted following evaluation of generated results on re-arranging the model. The maximum deviation of the model-predicted HAZHs (from experimental values) was less than 0.01% indicating a model confidence and reliability level above 99.99% and reliability coefficient of above 0.9999.