Butt and flat fillet welding of miniature LPG tanks, spiral pipes,ships, vehicles, machinery, cars..structural steels. Especially insensitive to oil, rust, ... small, it is very economical.Applicable to horizontal and flat fillet welding.Notes on Usage1,Dry the flux at 300 ... excessive, poor bead appearance may occur.3,Remove rust, scales, oil, paint, water, dirt and slag of tack welds from the groove ...