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A challenging weld repair of Grade 91 tubing by avoiding PWHT

In a collaborative research program, the BWI and Laborelec undertook the challenge to investigate the feasibility of a Cold Weld Repair methodology in order to weld repair T91 tubes without the use of gas backing and PWHT. The feasibility study so far demonstrated that a repair method based on the selection of an undermatched consumable and a controlled deposition procedure can result in an acceptable microstructure and hence inherent
properties. The results of the research program are very promising for temporary repair welding of T91 tubes within the containment of the boiler.