Welding Preheat Interpass: aluminum
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| aluminum | F-No.21-23 | no | 6061-T6 / 5083 / 5052 / 3003; AA series | standard | 93 | 200 | 0 | 32 | F-No.21-23#any | any | any | No preheat normally required; max interpass 200°F (93°C) to prevent HAZ softening and loss of temper; brush/clean oxide layer immediately before welding; use DCEP or AC-GTAW |
This is a sample. Search the full welding preheat interpass dataset and 300+ more by creating a free account and accessing the database.
Get started for FREE