Welding nozzle, esp. for MIG welding using aluminium wire - where recess in nozzle tip prevents wire welding in the nozzle

摘要

Welding nozzle has a heat resisting tip and an axial bore through which welding wire is fed. The nozzle tip has a circular recess forming a ring wall with height (h) which is several times the wire dia. (d). The bore (D) of the recess pref. equals or is less than its height (h); and the recess pref. has an upward conical taper leading to the axial bore through which the welding wire travels. One pref. nozzle has the dimensional ratios h = 3.5 x d; D = 3d; and D' = 5.5 x d; where D' is the dia. of the end of the nozzle. Used esp. in precision short arc welding using a consumable aluminium electrode wire, where the arrangement prevents the Al wire from welding in the end of the nozzle, e.g. at the end of a welding pass.