During plasma or gas cutting, strong melting often occurs, with the molten metal sagging on the beam-exit side. This so-called slag occurs both on the inner and outer contours of the workpiece and must be removed for economical further processing.
Common manual methods for deslagging include chipping it away using a hammer and chisel, or grinding using an angle grinder. In terms of mechanical processes, excess accumulations of material can be removed by grinding with a soft contact roller. Another industrial method is knocking it off using a slag hammer brush made up of multiple flexibly mounted pins.