Post Weld Heat Treatment (PWHT) is a method of normalizing the welds after completion to ensure the grain structure is able to handle the severe environment, heat, of cyclic service. We encounter projects where we have to price both localized and oven heat treatment methods.
A mobile set up will com to our shop and PWHT on‐site, this is very costly but will ensure that schedules are accelerated to oven PWHT methods and allow for quicker completion.
Another method to PWHT is sending spools to a PWHT company where they will use their ovens to complete PWHT cycle. This method is much more cost effective and allows multiple pieces to be completed at the same time.