Valve welding inspection is generally divided into two parts

1, document review needs to provide WPS, PQR, welder qualification WPQ.Does the supplied WPS cover the important variables required by the order such as base material, welding material, welding method, groove form, thickness, preheating, post-welding heat treatment, etc.The WPS assessed in accordance with ASME Title IX and NB/T47014 have corresponding requirements for significant variables.When important variables change, they must be reassessed.

2, The on-site welding inspection usually adopts VT (visual inspection) to check whether there are obvious welding defects, such as cracks, edge bites, welding bumps, poor forming, burning through, splashing, etc.Sealing surface surfacing welding, usually PT will be used to check whether there is a crack, but also need to detect the hardness of the sealing surface;Check the insert welding of the valve seat and the valve body, basically as long as the appearance is smooth, without biting edges, dislocation and welding tumors.Check the welding of structures such as lengthening pipes, when the order requires RT or UT check the internal quality.