Table 2.

Mass Median Aerodynamic Diameters (MMADs) and Geometric Standard Deviations (GSDs) of Welding Fumes for Different Shielding Gases and Processes, from MOUDI Data

Shielding Gas	Process	MMAD (nm)	GSD
Ar/CO2 99%/1%	Short circuit	340	1.46
Ar/O2 99%/1%	Short circuit	280	1.53
He/Ar/CO2 90%/7.5%/2.5%	Short circuit	330	1.47
Ar/CO2 99%/1%	Axial spray	260	1.23
Ar/O2 99%/1%	Axial spray	250	1.37
Ar/CO2 98%/2%	Pulsed spray	320	1.58
Ar/CO2 75%/25%	FCAW	363	1.35
—	SMAW	600	1.34