Abstract: Welding is an indispensable processing technology in process equipment. For commonly used welding methods such as butt welding of pressure parts, mature non-destructive testing methods have been used for welding quality control. Yet for special welding methods such as surfacing, the applicability of commonly used non-destructive testing methods is not good. Welding quality affects the working performance and life of process equipment directly. This paper takes surfacing of sealing surface as example and proposes an advanced non-destructive testing method, namely infrared non-destructive testing (IRNDT). Meanwhile, it compares and studies the commonly used penetration testing results. Finally, based on the testing results, the paper puts forward some suggestions for improving the non-destructive testing method and timing of special welding of process equipment.

Key words: process equipment; special welding; infrared non-destructive testing