Welding method and type of steel | Samples | Median or geometric mean (GM) (mg/m3) | Highest level (mg/m3) |
---|---|---|---|
MMA, manual metal arc welding; MAG, metal arc gas welding. | |||
MMA mild steel with or without local exhaust ventilation | 13 | 0.26 (GM) | 0.77 |
MAG mild steel with or without local exhaust ventilation | 49 | 0.30 (GM) | 1.8 |
MMA mould welding of rails | 92 | 0.13 (GM) | 1.14 |
MMA stainless steel without local exhaust ventilation | 67 | 0.14 (Median) | 0.78 |