This method describes a laboratory device and procedure for obtaining representative fume samples and determining fume generation rates of welding and allied processes. A separate collection procedure for determining fume constituents is described. A standard set of fume generation test conditions is specified to calibrate the sampling equipment. Methods for obtaining breathing zone and general area welding fume samples are not within the scope of this standard Sampling of gases is not within the scope of this standard. This standard will be revised as required in accordance with acknowledged technical advancements in the field. This standard makes sole use of U.S. Customary Units except for measures of mass@ fume generation rate@ and filter pore size. Approximate mathematical equivalents in the International System of Units (SI) are provided for comparison in parentheses or in appropriate columns in tables and figures.