Rectification of smaller defects related to Wheelburns , Squats , small cracks , joining small pieces – If welding is allowed to rectify such defects , then after good cleaning and grinding to remove the defects , the same preheating and interpass temperature to be kept as (A) for welding with M303G. The same slow cooling with insulating cloth to be maintained. If surface hardness is required for the weld then work hardening with the same procedure as (A) to be followed.