Is a weld procedure qualification required for the lining flange and the lining flange cover?
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May I ask whether a weld overlay welding procedure qualification is required for welding stainless steel lined flange rings and stainless steel lined flange covers?
Welding of stainless steel liner flanges and lined flange covers requires a weld overlay welding procedure qualification to ensure welding quality and safety. .
Looking at the structural components, it is generally a weld assessment for composite plates
The welding of stainless steel lining flanges and lined flange covers constitutes welding of dissimilar steels, not surfacing welding. Welding procedure qualification is required. However, it is not a welding procedure qualification for surfacing.
Let’s check the location. The fillet welds joining the gasket ring to the flange are welds between dissimilar steels. If the lining flange cover has plug welding holes, a weld assessment for surfacing welding may be required