Weld joint procedure qualification
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Which weld joints require welding procedure qualification?
All ABCD categories need to be evaluated
Welding procedure qualification shall be carried out for all weld joints of the pressure-bearing components on pressure vessels. Before welding pressure vessel products, the manufacturing unit shall conduct welding procedure qualification for the butt joints of the pressure-bearing components, as well as for the T-joints or corner joints that require full penetration; for the T-joints or corner joints between pressure-bearing components and non-pressure-bearing components that bear loads; and for the corrosion-resistant surfacing layers of the pressure-bearing components.
During the manufacturing of containers, all weld joints should undergo a welding procedure qualification to assess the reliability of the welding.
Article 67 of the \"Regulations on Safety Technical Inspection of Pressure Vessels\" stipulates that prior to welding pressure vessel products, a welding procedure qualification must be carried out for the butt weld joints between pressure-bearing components, as well as for the T-joint welds that require full penetration; for the fully penetrated T- or fillet weld joints between pressure-bearing components and non-pressure-bearing components that bear loads; and for the corrosion-resistant surfacing layers on pressure-bearing components.
In practical work, the assessment of butt welds is more common; that is, there are many assessments for Class A and B welds, and many Class C/D welds can also be covered. Sometimes type tests are conducted. It depends on the specific situation of the company.
You can refer to standards such as tolerance specifications and steam specifications