A tool for removing slag, scale or unwanted metal when preparing a surface for welding or finishing a weld.

A chipping hammer may be equipped with either drift or chisel ends, chisels on each end set at right angles to each other, or with adjustable chisels. Cleaning a surface with a chipping hammer is accompanied by a peening action which helps knock off particles of slag or scale, but also has a tendency to compact the weld metal slightly. Peening results in higher density of the weld and improves soundness and strength. The peening is usually followed by a vigorous brushing with a stiff wire brush.