Figure 2From: Comparison of stainless and mild steel welding fumes in generation of reactive oxygen speciesElectron micrographs of two of the 15 filters used in the MOUDI and nano-MOUDI. A) shows stage 4 (3.2 μm cut-off) larger particles and the formation of agglomerated chains of particles. B) shows stage 12 (0.032 μm cut-off) smaller individual particles and less chain formation.Back to article page