Welding Wps Variables: GTAW
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 | notes | requalification required | typical range or limits | variable category | variable name | variable type |
|---|---|---|---|---|---|---|---|---|---|---|
| GTAW | essential#QW-403.11 | all | QW-403.11 | Change in P-Number of base metal | Same as other processes | yes | P-1 through P-15F; see QW-424 | base_metal | P-Number change | essential |
| GTAW | essential#QW-404.4 | all | QW-404.4 | Change in F-Number of filler wire | No filler metal (autogenous) constitutes F-No. = none; change to or from autogenous is essential | yes | F-6 bare wire typical for GTAW (ER70S-2 ER309L etc.) | filler_metal | F-Number change | essential |
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