Metal fusion bonding – Miscellaneous
Patent
1981-05-07
1983-11-15
Godici, Nicholas P.
Metal fusion bonding
Miscellaneous
228219, B23K 3700
Patent
active
044151144
ABSTRACT:
A purge gas unit is provided for establishing an enclosed zone for purge gas within a tube or pipe having portions which are to be joined by welding at a predetermined location relative to the length of the tube or pipe. The purge unit includes at least one cone to be positioned on one side of the location where the welding is performed and a second cone positioned on the other side of the location. A purge gas supply tube is connected between the cones and has at least one opening therebetween through which purge gas is supplied to the weld zone in the pipe or tube between the cones. The gas supply tube extends through one of the cones beyond the weld zone defined between them and is connected to gas supply means. The gas supply tube also aids in withdrawing the cones from the pipe or tube after the weld is completed or, with tubing which is moved continuously and butt-welded along a longitudinal seam, the gas supply tube can be used to hold the cones in a stationary position as the tubing is moved longitudinally during the forming and welding operations. In a preferred form, the cones face in a common direction. Also, the gas supply tube between the cones can be flexible to enable the cones to be withdrawn through a curved portion of the pipe or tube after the welding operation when the pipe or tube is stationary.
REFERENCES:
patent: 1647223 (1927-11-01), Hart
patent: 2654014 (1953-09-01), Schaefer
Raymond A. Mueller, Welding Apparatus, Jun. 30, 1953.
Godici Nicholas P.
Gutchess, Jr. Allen D.
Jordan M.
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