Welding Preheat Interpass: copper
Minimum preheat and maximum interpass temperatures for welding per AWS D1.1, ASME BPVC, ASME B31.3, and EN 1011. Covers carbon steels (AWS categories A/B), HSLA (category C, HPS 70W/100W), quenched and tempered (category D), Cr-Mo alloys (P5/P11/P22/P91/P4/P5B), austenitic stainless (P8), duplex stainless (P10H), nickel alloys, aluminum, titanium, and copper. Each record includes base metal group, thickness range, carbon equivalent, preheat/interpass temperatures in both F and C, PWHT requirements, hydrogen control level, and welding process notes. 46 records.
| base metal group | AWS group number | PWHT required | base metal examples | hydrogen control | interpass max C (degC) | interpass max F (degF) | preheat min C (degC) | preheat min F (degF) | record key | thickness range in | thickness range mm | welding process notes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| copper | F-No.31-37 | no | C10200 Deoxidized copper / C71500 Cu-Ni / C61900 Al-bronze | standard | 205 | 400 | 93 | 200 | F-No.31-37#1/4_to_1 | 1/4_to_1 | 6_to_25 | Sections over 1/4in: 200°F preheat required due to high thermal conductivity; use high-deposition processes (GMAW/SAW); max interpass 400°F |
| copper | F-No.31-37 | no | C10200 Deoxidized copper / C71500 Cu-Ni / C61900 Al-bronze | standard | 205 | 400 | 204 | 400 | F-No.31-37#over_1 | over_1 | over_25 | Thick copper: 400°F preheat required; maintain preheat throughout; consider induction or furnace pre-heating for very thick sections (>2in) |
| copper | F-No.31-37 | no | C10200 Deoxidized copper / C71500 Cu-Ni / C61900 Al-bronze | standard | 205 | 400 | 21 | 70 | F-No.31-37#up_to_1/4 | up_to_1/4 | up_to_6 | Thin sections: no preheat; copper conducts heat rapidly requiring higher heat input; use DCEP GTAW or GMAW |
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