Welding

in the metallic arts, an inti-+ mate union produced between the surfaces of two pieces of malleable metal, when heated almost to fusion, and hammered. This uniort is so strong, that when two bars of metal are properly welded, the place of jenction is as strong, relatively to its thickne , as any other part of the bar. Only tio of the old metals; however, are capable of firm union by welding, namely platina and iron; yet the same property belongs to the newly discovered metals, pota ium and sodiiim.