EWI/TWI controlled deposition repair welding procedure for 1{1/4}Cr-{1/2}Mo and 2{1/4}Cr-1Mo steels

The Edison Welding Institute (EWI) and TWI of Cambridge, England, have completed a group-sponsored project that has been successful in demonstrating the acceptability to weld repair 1{1/4}Cr-{1/2}Mo and 2{1/4}Cr-1Mo steels without PWHT. A detailed SMAW welding procedure was developed for all welding positions that provides excellent weldment properties in the as-welded condition for both Cr-Mo steels. This procedure is supported by detailed welding instructions for controlled deposition welding, a welder training document, and instructions for welding of the welder qualification test assembly. The program included a significant amount of mechanical property characterization and performance testing to validate the acceptability of controlled deposition, as-welded repair of the Cr-Mo steels. The purpose of the present paper is to present the details of the EWI/TWI controlled deposition welding procedure and to provide data that demonstrates the ability of the procedure to refine and temper the parent steel HAZ.