Welding Wps Variables: GTAW
nonessential#QW-404.14 to supplementary essential#QW-403.6
ASME BPVC Section IX and AWS D1.1 welding procedure specification (WPS) essential, supplementary essential, and nonessential variables for 8 processes (SMAW, GMAW, GTAW, FCAW, SAW, ESW, EGW, PAW) with QW variable numbers, requalification requirements, and P-number applicability
| welding process | variable key | P number applicability | QW variable number | description | requalification required | standard | typical range or limits | variable category | variable name | variable type |
|---|---|---|---|---|---|---|---|---|---|---|
| GTAW | nonessential#QW-404.14 | all | QW-404.14 | Change from autogenous (no filler) to filler metal added | no | ASME BPVC Section IX 2023 Table QW-256; QW-404.14 | Exception: change to autogenous from filler is essential per QW-404.14 (see notes) | filler metal | Addition of filler metal | nonessential |
| GTAW | nonessential#QW-405.1 | all | QW-405.1 | Addition of positions | no | ASME BPVC Section IX 2023 Table QW-256 | 1G through 6GR | position | Position change | nonessential |
| GTAW | nonessential#QW-410.1 | all | QW-410.1 | Change from multiple to single pass per side | no | ASME BPVC Section IX 2023 Table QW-256 | Same as SMAW | technique | Single vs. multiple pass | nonessential |
| GTAW | supplementary essential#QW-403.6 | P-1 through P-5F | QW-403.6 | Change in Group Number for CVN toughness | yes | ASME BPVC Section IX 2023 Table QW-256; QW-403.6 | Same as other processes; required for toughness qualification | base metal | Group Number change | supplementary essential |
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