Welding Wps Variables: SAW
nonessential#QW-409.4 to supplementary essential#QW-404.33
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 |
|---|---|---|---|---|---|---|---|---|---|---|
| SAW | nonessential#QW-409.4 | all | QW-409.4 | Change in arc voltage outside qualified range | no | ASME BPVC Section IX 2023 Table QW-254 | Typical SAW voltage 26-34V; range ±3V | electrical | Voltage range change | nonessential |
| SAW | supplementary essential#QW-403.6 | P-1 through P-5F | QW-403.6 | Change in Group Number for CVN | yes | ASME BPVC Section IX 2023 Table QW-254; QW-403.6 | Same toughness rule; SAW weld metal often requires CVN testing for pressure vessels | base metal | Group Number change | supplementary essential |
| SAW | supplementary essential#QW-404.33 | all | QW-404.33 | Change from single wire to multiple wire (tandem; twin-arc) SAW | yes | ASME BPVC Section IX 2023 Table QW-254; QW-404.33 | Single-wire vs tandem-wire SAW produces different heat inputs and cooling rates | filler metal | Single to multiple wire change | supplementary essential |
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