The Effect of Metal Transfer Modes and Shielding Gas Composition on the Emission of Ultrafine Particles in MAG Steel Welding

Translated title of the contribution: Efeito dos modos de transferência e da composição de gás de protecção na emissão de partículas ultrafinas na soldadura MAG de aços

J. F. Gomes, R. M. Miranda, Patrícia A. Carvalho, M. L. Quintino

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

The 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. The emission of airborne ultrafine particles increases with the current intensity as fume formation rate does. When comparing the shielding gas mixtures, higher emissions were observed for more oxidizing mixtures, that is, with higher CO2 content, which means that these mixtures originate higher concentrations of ultrafine particles (as measured by number of particles. by cubic centimeter of air) and higher values of alveolar deposited surface area of particles, thus resulting in a more hazardous condition regarding welders exposure.

Translated title of the contributionEfeito dos modos de transferência e da composição de gás de protecção na emissão de partículas ultrafinas na soldadura MAG de aços
Original languageMultiple languages
Pages (from-to)168-176
Number of pages9
JournalSoldagem & Inspecao
Volume19
Issue number2
DOIs
Publication statusPublished - 2014

Keywords

  • gas metal arc Welding
  • welding fumes
  • ultrafine particles
  • alveolar deposited surface area

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