Expandable purge unit

Details Expandable purge unit Expandable purge unit

1979-05-04

1981-03-03

Reynolds, B. A.

Electric heating

Metal heating

Nonatmospheric environment at hot spot

219 74, 228 57, B23K 916

Patent

active

042543215

ABSTRACT:
An improved purge unit is provided for establishing an enclosed zone around a weld area for retaining an inert gas. The purge unit is particularly advantageous when welding a branch pipe or pipe connection to a main pipe or header. The purge unit has a cone-shaped member which is inserted into an opening in the header through the branch pipe or connection and is then expanded to establish the enclosed zone around the inside of the weld area. An inert gas is then supplied through the purge unit into the zone and the cone-shaped member is subsequently collapsed and withdrawn after the weld is complete. An expandable tube is employed to expand the cone-shaped member and has a rod extending therethrough and connected to the member to provide greater stability for the purge unit.

REFERENCES:
patent: 1549168 (1925-08-01), Townsend
patent: 2843154 (1958-07-01), Hoskins
patent: 3994429 (1976-11-01), Hallenbeck et al.
patent: 4096372 (1978-06-01), Hallenbeck

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