There is silicone in some wire for a cleanser. If the base metal is dirty/has oxides,or if you don't have quite enough shielding gas, the silicone will come out of the weld, leaving minor "slag" on the surface.
Oct 01, 2009 Rating
slag by: Anonymous
Slag comes from the wire coating or flux. If you are using a flux cored wire and a shielding gas the process is called duel shield if you don't want any slag use a hard wire with shielding gas. islandwelder@earthlink.net
