Heat applied after a welding operation is called?

The term "postheat" refers specifically to heat applied after a welding operation has been completed. This process is often utilized to relieve residual stresses and reduce brittleness in the weld area, especially in high-strength steels or under particular conditions where stress concentrations might lead to cracking or other issues. By applying postheat, the metallurgical properties of the welded joint can be improved, enhancing its overall performance and longevity.

Preheat, on the other hand, is the heat applied to a base metal before welding begins, aimed at minimizing the risk of cracking and ensuring proper fusion during the welding process. Finishing heat and heat treatment are broader terms that can apply to various processes involving heat but do not specifically refer to the heat applied after a welding operation. Thus, postheat is the precise term that describes this critical stage in the welding process, focusing on the treatment of the weld after it has been made.