Valve welding inspection
Valve welding inspection generally consists of following two parts:
1. Document review:
1.1 WPS(WELDING PROCEDURE SPECIFICATION), PQR, welder qualification WPQ;
1.2 Whether supplied WPS covers key variables such as parent material, welding material, welding method, groove form, thickness, preheating and post-weld heat treatment required by the order.
1.3 In accordance with WPS assessed by ASME volume 9 and NB/T47014, there are corresponding key variables in WPS; any key variable changed will lead to re-evaluation.
2. Inspection of field welding:
2.1 Usually VT (visual inspection) is used to check whether there are obvious welding defects on valves, such as cracks, nibbling, weld nodules, forming defects, burn-through, spatter, etc.
2.2 PT is usually used to check whether there is any crack on the welding sealing face.
2.3 Soldering of the seat and body requires a smooth appearance, no undercut, dislocation or overlap.
2.4 RT or UT checking internal quality for structural welding such as valve with extension nipples will be performed when order is required.
1. Document review:
1.1 WPS(WELDING PROCEDURE SPECIFICATION), PQR, welder qualification WPQ;
1.2 Whether supplied WPS covers key variables such as parent material, welding material, welding method, groove form, thickness, preheating and post-weld heat treatment required by the order.
1.3 In accordance with WPS assessed by ASME volume 9 and NB/T47014, there are corresponding key variables in WPS; any key variable changed will lead to re-evaluation.
2. Inspection of field welding:
2.1 Usually VT (visual inspection) is used to check whether there are obvious welding defects on valves, such as cracks, nibbling, weld nodules, forming defects, burn-through, spatter, etc.
2.2 PT is usually used to check whether there is any crack on the welding sealing face.
2.3 Soldering of the seat and body requires a smooth appearance, no undercut, dislocation or overlap.
2.4 RT or UT checking internal quality for structural welding such as valve with extension nipples will be performed when order is required.