The invention discloses a
welding gun for rotating arc
gas metal arc welding. The
welding gun comprises a
welding gun outer
barrel, wherein the welding gun outer
barrel is internally provided with an eccentric
assembly, the eccentric
assembly comprises an upper inner
barrel, a lower inner barrel and an eccentric slide block adjustment mechanism, the welding gun also comprises a hollow rotation shaft arranged on the eccentric
assembly, when the upper inner barrel and the lower inner barrel rotate, the hollow rotation shaft does eccentric revolution surrounding the axle line of the upper inner barrel and the lower inner barrel, and does reversed rotation surrounding the self axle line at the same time, the front end of the hollow rotation shaft is connected with an electric conduction
nozzle, the rear end of the hollow rotation shaft is connected with an electric conduction disc, during the welding, the
electric current flows into the electric conduction disc through a
flexible cable from an end cover, then reaches the electric conduction
nozzle through the hollow rotation shaft, and is conducted onto a welding wire, a rotating arc generated along with the rotation of the hollow shaft and the electric conduction
nozzle. The
flexible cable can stably conducting
electricity in a fixing manner, and the problem of stable electric conduction between a rotating part (the hollow rotation shaft) and a fixing part (welding cable) is solved. The welding gun disclosed by the invention can be used for a variety of positions welding such as flat position welding, over-
head position welding, vertical position welding and horizontal position welding, and the appearance of a welded joint is good and in a clear fish-scale pattern shape.