Similar to welding, this part defines requirements for brazing procedures and personnel. QF - Plastic Fusing Qualifications
| | Essential? | Typical Change Requiring Re-qual | |--------------|----------------|--------------------------------------| | Process (e.g., SMAW → GTAW) | Yes | Any process change | | Base metal P-Number | Yes | P-1 to P-4 | | Filler metal F-Number | Yes | F-1 to F-4 | | Thickness (t) | Yes | Exceeding 2t from PQR | | Diameter (pipe) | Yes (for welder) | Below 2-7/8" OD | | Preheat temperature | Supplementary | Reduction by more than 100°F | | PWHT | Supplementary | Adding or removing PWHT | | Shielding gas | Yes (GTAW/GMAW) | Ar → Ar+CO₂ > 20% | asme sec-ix