دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a welding technique for joining pipe ends. Two general types of automatic welding used in pipeline construction are submerged-arc welding and automatic wire welding.

n: an automatic welding process utilising a continuous wire feed and a shielding gas. Automatic wire welding is similar to semiautomatic welding except that manual adjustment of the rate of wire feed and amount of shielding gas is unnecessary. See also semiautomatic welding.

n: a welding technique in which the arc is maintained in a continuous stream of gas between an electrode and the pipe being welded. The semi- automatic welding apparatus consists of a spool of coiled wire that provides filler metal for the weld, a pair of driving rollers that guide the wire to the weld, a welding gun, and a supply of shielding gas. Each type of semiautomatic welding is usually identified by the type of shielding gas used;in CO2 wire welding, for example, carbon dioxide is the shielding gas.

n: an automatic welding process utilizing a continuous wire feed and a shielding medium of fusible granular flux. Submerged-arc welding offers high deposition rates and weld passes of substantial thickness.