ASME BPVC Sec IX

Key requirements (8)

• Welding and brazing qualifications.
• WPS (Welding Procedure Spec) supported by PQR (Procedure Qualification Record).
• PQR essential variables include: P-number, F-number, A-number, thickness range, position, preheat, PWHT, impact.
• Welder/operator qualification: bend tests OR radiography per QW-302.
• Coupon thickness qualifies a range: Table QW-451 (e.g., 25 mm coupon qualifies 5–50 mm).
• Position qualification: 6G qualifies all positions for pipe.
• Performance qualification expires if 6 months without welding (re-qualify).
• Notch toughness essentials when impact required by construction code.