Abstract
—The micro-structural changes in type 304L stainless steel post weld solution treated at 1060 C for 15 minutes time were studied using streicher screening corrosion test, hardness traverses, repeated solution treatment cycles, delta ferrite measurements and optical microscopic techniques. The aim of the present paper is focused on post weld heat treatment qualification by describes the results of an investigation to understand the micro structural changes that taken place in type 304L stainless steel weld deposits as function of temperature / time by showing any presence of re-crystallization and / or strain induced grain boundary migration and the dissolution of any carbide formed at grain boundaries in welding monitored by metallographic examination.