Comparative investigations in order to characterise ultrafine particles in fumes in the case of welding and allied processes

Discussions about the stipulation of limiting values for welding fumes in the air and for the ultrafine particles (UFPs) they contain as well as recent findings about the properties of particles in the Nano size range caused the "Metal and Surface Treatment" expert committee in the employers' liability insurance association to have investigations conducted into the type, quantity and parameters of these particles. These investigations may be used for a subsequent assessment of the possibly pathogenic effect of these particles. In particular, the objective was to obtain data material comparable in this regard from currently used welding, cutting and soldering/brazing processes and materials.