Numerous researches have been carried in the past decade to explore the insight of the welding process such as parameter study, defect formation mechanism, high temperature materials joining, etc [7–10]. These studies have improve FSW process suitable for commercial application and many industries like automobile, aerospace, petrochemical, etc have successfully implemented FSW for material joining [11,12]. Even though the FSW process emerged as leading joining process, the weldment requires some inspection for assessing their quality, for which destructive testing methodologies are widely followed