The objective of this work is to demonstrate the tempering response quantification approach for process - property optimization in the heat affected zone (HAZ) of SA-508 Gr. 2 Cl. 1 (formerly designated as SA-508 Cl. 2) subjected to temper bead welding (TBW).

The tempering response in the CGHAZ and ICHAZ was quantified by a series of TBW thermal history simulations, followed by microstructural characterization and hardness measurements. Tempering response predictive equations were developed utilizing a version of the Grange Baughman parameter (GBP), modified to reflect the thermal histories in multi-pass welding.

In parallel, the accuracy of the tempering response quantification and predictive hardness equations were validated. Validation was achieved through experimental welding with thermal history acquisition, determination of a predicted hardness value using the recorded thermal data, and comparison of the predicted values with micro-hardness measurements.

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