WELDING

There are D very few of the metals which arc susceptible of being united by pre ure or hammering, or of being welded together. Two pieces of pota ium may idtta at common temperatures (from 60° to 80°); but mi is generally applied to the junction of two pli i iron at a white heat, or of iron and steel. Platinum, also, although infusible, may be welded at a white heat; and it is la this way that that valuable metal, when in the granular or pulverulent state, is worked Into bars. [s. 1347]