A controlled heating and cooling process applied to welded components or structures to improve their mechanical properties, relieve residual stresses, and reduce the riskA measure of loss in terms of both the incident likelihood of occurrence and the magnitude of the consequences. of weldLocalized coalescence of metals produced by heating the materials to the welding temperature, with or without the application of pressure, or by the application…-related defects. PWHTA controlled heating and cooling process applied to welded components or structures to improve their mechanical properties, relieve residual stresses, and reduc… reduces risk of cracking and can also increase the strength and hardness of the material.