The objective of this paper is to provide an overview of the main welding defects that frequently exist in piping and equipment and how to detect these defects without destroying the welds using Non Destructive Testing (NDT) methods. Then, the sensitization of stainless steel weld, characterization, processing and structure properties of HAZ as well as weld metal will be discussed in details. Furthermore, this paper will illustrate the treatment of the weld decay by recovery of passivation film after welding which will be followed by prevention of intergranular corrosion or weld decay of SS using surface mechanical attrition treatment and all of these will be described with help of characterization techniques XRD, SEM, TEM and EPMA.

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