Welding & Fabrication Reference
Welding & Fabrication Quick Reference
Plan qualification, filler selection, heat treatment, weld examination, end preparation, joint-type selection and dissimilar-metal joints without reproducing controlled Code tables.
Base-metal qualification index (ASME IX / B31.3)
7 items| Specification / Grade | Product | Family | P-No. | Group | Caution & Controls | Source Reference |
|---|---|---|---|---|---|---|
| SA/ASTM A106 Grade B | Seamless pipe | Carbon steel | P-P-No. 1 | Group 1 | Confirm the exact adopted material specification and any supplementary requirements. | ASME BPVC Section IX (2025)QW/QB-422; verify exact specification, grade and UNS row |
| SA/ASTM A333 Grade 6 | Low-temperature pipe | Carbon steel | P-P-No. 1 | Group 1 | Impact-test and low-temperature service requirements are separate from P-Number grouping. | ASME BPVC Section IX (2025)QW/QB-422; verify exact specification, grade and UNS row |
| SA/ASTM A335 P11 | Seamless pipe | 1.25Cr–0.5Mo alloy steel | P-P-No. 4 | Group 1 | Heat treatment and hardness controls normally govern fabrication planning. | ASME BPVC Section IX (2025)QW/QB-422; verify exact specification, grade and UNS row |
| SA/ASTM A335 P22 | Seamless pipe | 2.25Cr–1Mo alloy steel | P-P-No. 5A | Group 1 | Verify thickness-dependent preheat, PWHT and impact-test requirements. | ASME BPVC Section IX (2025)QW/QB-422; verify exact specification, grade and UNS row |
| SA/ASTM A312 TP304L | Pipe | Austenitic stainless steel | P-P-No. 8 | Group 1 | Control contamination, heat tint and interpass temperature; P-Number alone does not address corrosion service. | ASME BPVC Section IX (2025)QW/QB-422; verify exact specification, grade and UNS row |
| SA/ASTM A312 TP316L | Pipe | Austenitic stainless steel | P-P-No. 8 | Group 1 | Confirm filler selection against service corrosion requirements and project ferrite limits. | ASME BPVC Section IX (2025)QW/QB-422; verify exact specification, grade and UNS row |
| SB/ASTM B167 UNS N06600 | Nickel-alloy pipe/tube | Nickel-chromium alloy | P-P-No. 43 | Verify current row | Nickel-alloy group assignments and filler restrictions must be checked in the licensed edition. | ASME BPVC Section IX (2025)QW/QB-422; verify exact specification, grade and UNS row |
Base-metal to filler-metal screening
7 items| Base-metal pair | Process | AWS Classification | F-No. | A-No. | Selection basis | Source Reference |
|---|---|---|---|---|---|---|
| P-No. 1 → P-No. 1 | SMAW | E7018 family | F-Typical F-No. 4 | A-Typical A-No. 1 | Common low-hydrogen carbon-steel screening family; match strength, toughness and hydrogen controls to the WPS. | ASME BPVC Section IX (2025)QW/QB-422; verify exact specification, grade and UNS row |
| P-No. 1 → P-No. 1 | GTAW | ER70S-2 / ER70S-6 family | F-Verify by filler specification | A-Typical A-No. 1 | Common carbon-steel root/fill family; deoxidizer choice depends on cleanliness and procedure. | ASME BPVC Section IX (2025)QW/QB-422; verify exact specification, grade and UNS row |
| P-No. 4 → P-No. 4 | SMAW | E8018-B2 family | F-Typical F-No. 4 | A-Verify deposited chemistry | Nominal 1.25Cr–0.5Mo matching family; confirm temper-bead, hardness and PWHT controls. | ASME BPVC Section IX (2025)QW/QB-422; verify exact specification, grade and UNS row |
| P-No. 5A → P-No. 5A | SMAW | E9018-B3 family | F-Typical F-No. 4 | A-Verify deposited chemistry | Nominal 2.25Cr–1Mo matching family; final choice must follow qualified chemistry and heat treatment. | ASME BPVC Section IX (2025)QW/QB-422; verify exact specification, grade and UNS row |
| P-No. 8 (304L) → P-No. 8 (304L) | GTAW / GMAW / SMAW | ER308L / E308L family | F-Process-specific; verify Section IX | A-Typical austenitic weld-metal group | Common matching stainless family; verify ferrite, impact and corrosion-service requirements. | ASME BPVC Section IX (2025)QW/QB-422; verify exact specification, grade and UNS row |
| P-No. 8 (316L) → P-No. 8 (316L) | GTAW / GMAW / SMAW | ER316L / E316L family | F-Process-specific; verify Section IX | A-Typical austenitic weld-metal group | Common matching molybdenum-bearing stainless family; confirm service chemistry and ferrite limits. | ASME BPVC Section IX (2025)QW/QB-422; verify exact specification, grade and UNS row |
| P-No. 1 → P-No. 8 | GTAW / SMAW | ER309L / E309L family | F-Process-specific; verify Section IX | A-Typical austenitic weld-metal group | Common transition family for carbon steel to austenitic stainless; dilution and service temperature can require a nickel-base alternative. | ASME BPVC Section IX (2025)QW/QB-422; verify exact specification, grade and UNS row |