As an accessory process of welding work, it refers to the operation of heating the base metal surface to which welding metal is welded before and during welding to a certain temperature or higher.
Shell plates supporting structures (columns, bracing, etc.), and additional devices for pressurized parts perform PWHT after welding is completed, and NDE is completed before PWHT.
Curing and dry-out with high-efficiency gas burners and electrical equipment removes moisture contained in the refractory, thereby improving the quality and durability of refractory products.
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