WELDING

There are a very few of the metals which are susceptible of being united by pre ure or hammering, or of being welded together. Two pieces of pota ium may be welded at common temperatures (from 60° to 80°); but the term is generally applied to the junction of two pieces of iron at a white heat, or of iron and steel. Platinum, also, although infusible, may be welded at a white heat; and it is in this way that that WELL. valuable metal, when in the granular or pulverulent state, is worked into bars. [s. 1336]