Metal fusion bonding – Including means to apply flux or filler to work or applicator – Gaseous flux
Patent
1990-11-15
1992-03-31
Rowan, Kurt
Metal fusion bonding
Including means to apply flux or filler to work or applicator
Gaseous flux
228219, B23K 500
Patent
active
051000431
ABSTRACT:
A purge gas unit establishes an enclosed zone for purge gas within tubes or pipes having portions which are to be joined by welding. The purge gas unit includes a first bladder to be positioned on one side of the welding location and a second bladder positioned on the other side of the location. A purge gas supply tube extends through the first bladder and has an opening near the second bladder through which purge gas is supplied to the weld zone or space between the bladders. A vent tube extends through the first bladder and communicates with the weld zone near the first bladder and with a space beyond the first bladder. A safety cable also is attached to the second bladder and extends at least substantially through the first bladder, with the cable enabling the purge unit to be removed from the tubes after welding. The bladders can have annular chambers with central passages through which elongate members can extend. The bladders, in another embodiment, can be substantially flat when not inflated.
REFERENCES:
patent: 3095844 (1963-07-01), Thielsch
patent: 3194466 (1965-07-01), Davis
patent: 3292254 (1966-12-01), Sloan
patent: 3338499 (1967-08-01), Gilbert
patent: 4669650 (1987-06-01), Moe
patent: 4828160 (1989-05-01), Sundholm
patent: 4912293 (1990-03-01), Mueller et al.
Gutchess, Jr. Allen D.
Mah Chuck Y.
Rowan Kurt
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