Welding Preheat Interpass: duplex_SS
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| duplex_SS | P10H | no | ASTM A790 2205 / A928 2205; 22Cr-5Ni-3Mo (S31803 / S32205) | low_H2_required | 150 | 300 | 10 | 50 | P10H#any | any | any | Preheat to remove chill (50°F min); critical max interpass 300°F to maintain ferrite/austenite balance (30-50%); use matching ER2209 filler; avoid over-heating |
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