This article discusses two categories of stainless steel casting alloys and their nomenclature. It provides information on two situations in which welding of stainless steel castings is required. These situations are based on casting defects and selection of welding processes. The article presents compositions and typical microstructures of corrosion-resistant stainless steel casting alloys in tabular form. It presents special considerations for the welding of martensitic stainless steel castings. The article reviews the two most serious problems encountered in the welding of stainless steel castings, namely, solidification hot cracking and heat-affected zone hot cracking. It concludes with a discussion on the some useful considerations for welding corrosion-resistant alloys to avoid defects.
This article discusses four types of defects in materials that have been fusion welded and that have been the focus of much attention because of the magnitude of their impact on product quality. These include hot cracks, heat-affected zone (HAZ) microfissures, cold cracks, and lamellar tearing. These defects, all of which manifest themselves as cracks, are characteristic of phenomena that occur at certain temperature intervals specific to a given alloy. The article presents selected alloy 625 compositions used in weldability study.