If there are technical requirements or the size of the workpiece is not huge and the equipment conditions permit, it is natural to carry out stress relief annealing as a whole.

On the contrary, for larger tooling equipment, such as bridges and reservoir gates, or without suitable heating equipment, only local stress relief annealing treatment can be carried out on the weld.

Local annealing treatment, such as covering the weld with a heating device called a heating blanket, can be heat-treated by electrifying.