'A DEVICE AND A METHOD FOR PURGING INERT GAS INSIDE WELDABLE TUBES TO ELIMINATE ROOT OXIDIZATION OF WELD METAL'

摘要

The invention relates to a device for purging inert gas into rotating tubes during a process of gas - shielded butt welding of the tubes to eliminate root oxidization of weld metal and the adjacent regions comprising a purging gas spray distribution (8) located adjacent the weldable joint; a purging gas hose (7) attached to the distributor (8) and axially extending backwardly through the inner diameter upto the tube inlet; an outlet hose connector nipple (6) having a first end and a second end, the first end of the nipple (6) connected to the distal end of the purging hose (7), and the second end of the nipple (6) connected to a stepped Teflon adaptor (4) which is sealingly connected to the tube inlet; and a bearing (5) with a bearing adaptor (3) and a bearing nipple (2) disposed inside the Teflon adaptor (4) to allow supply of purging gas from a gas source to the bearing nipple (2) through an inlet hose connector nipple (1) brazed to the bearing adaptor (3), wherein the gas spray distributor (8) regulating the gas flow in all directions of the weldable joint to eliminate root oxidization.