Table 1.
Actual galvanized steel spot welding exposure chamber concentrations.
Exposure Condition | Fume Concentration (mg/m3)a |
---|---|
Galvanized steel, no glue | 24.6 ± 2.6 |
Galvanized steel, plus glue | 23.8 ± 2.8 |
Galvanized steel, plus anti-spatter spray | 22.9 ± 4.0 |
Mean daily fume concentrations in the exposure chamber ± standard error (n = 8). Measurements were made in duplicate every 30 min during the daily 4-h exposure for each day. Target fume concentration was 25 mg/m3. Inhalation exposures were for 4 h/day for 8 days.