GMAW procedure qualification and production application of WDB620D steel for spiral case of Fengning Pumped Storage Power Station

Welding procedure qualification of WDB620D steel was evaluated by gas metal arc welding (GMAW). Non-destructive testing was carried out on welds of WDB620D steel, and mechanical properties tests of tensile, bending and impact were carried out on welded joints. Test results showed that mechanical properties and weldability indexes of welding procedure qualification met requirements of drawings and ASME Ⅸ standard. GMAW process was applied and verified in the volutes manufacturing of Fengning Pumped Storage Power Station, and good results were obtained.