The objective of this Guidance Note is to describe the various post weld heat treatment techniques, when it has to be used and the circumstances where it can legitimately be avoided. The Note is also intended to assist the Fabrication Industry in providing information on where to look for guidance on post weld heat treatment heating rates, cooling rates, holding temperatures, holding times, thermocouple placement, thermocouple attachment, and qualification of welding procedures. It is intended for use by Welding Supervisors, Welding Inspectors, fabrication personnel and Engineers involved in both the fabrication industry and typical Owner/Operator industries.