Patent ID: 6180918
Filing Date: 2001-01-30
Classification: B23K

Abstract:
A method for making a welded joint, including the following steps:grooving edges of parts for welding with formation of a junction of Y-shaped form when the edges of the parts are placed adjacent one another,making a shrink groove for a weld seam root during said grooving of said part edges,assembling a joint being welded by tack welding prior to filling the junction, the tack welding being carried out by manual argon-arc welding with direct polarity current using a non-consumable electrode and chromium-plated filling wire, that is fed into the weld seam root,filling the junction by means of multi-run automatic electric arc welding using a chromium-plated filling wire that is fed into the weld seam root,making a first run with a tungsten non-consumable electrode in an argon medium with direct polarity current,making a second and subsequent runs with a consumable electrode in a helium medium with reverse polarity current,making a last run with a consumable electrode in a mixture of shielding gases consisting of 50% argon and 50% carbon dioxide with reverse polarity current.