Babcock Valves has developed new welding procedures for F91 and F92 materials, avoiding direct flame heating on the forgings and using electrical heating resistances during the entire process of pre-heating, interpass maintenance and post-weld heat treatment. The process includes dehydrogenation between 280-300°C for 2 hours per 25 mm thickness with minimum of 2 hours.

The temperature is permanently monitored during the entire process. This guarantees that the material is 100% martensitic and the superficial and volumetric integrity of the same is perfectly controlled. For more information about our quality procedures and certifications, you can visit our quality section.

Electric heating for welding