Welding Preheat Interpass: nickel_alloy
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| nickel_alloy | F-No.41-45 | no | Alloy 625 / Alloy 825 / Alloy 276; Inconel / Incoloy grades | low_H2_required | 150 | 300 | 21 | 70 | F-No.41-45#any | any | any | Preheat to room temperature minimum (70°F); clean base metal thoroughly; max interpass 300°F; use matching filler (ERNiCrMo-3 for 625); avoid contamination from Cu or Pb |
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