The effect of metal transfer modes and shielding gas composition on the emission of ultrafine particles in MAG steel welding

Abstract

Resumo Este estudo consistiu na caracterização de partículas ultrafinas emitidas durante a soldadura de arco de aço ao carbono e inoxidável, utilizando diferentes misturas como protecção gasosa por forma a avaliar a influência dos modos de transferência AbstractThe present study aims to characterize ultrafine particles emitted during gas metal arc welding of mild steel and stainless steel, using different shielding gas mixtures, and to evaluate the effect of metal transfer modes, controlled by both processing parameters and shielding gas composition, on the quantity and morphology of the ultrafine particles. It was found that the amount of emitted ultrafine particles (measured by particle number and alveolar deposited surface area) are clearly dependent from the main welding parameters, namely the current intensity and the heat input of the welding process.