Electric heating – Metal heating – Of cylinders
Patent
1994-06-24
1996-01-23
Shaw, Clifford C.
Electric heating
Metal heating
Of cylinders
B23K 9028
Patent
active
054866707
ABSTRACT:
An orbital type welding apparatus adapted for use in welding tubes into a tubesheet by an inert gas electric arc welding process. The welding apparatus includes a housing, a rotor rotatably mounted within the housing, and a pilot probe unit extending from the housing lower side. The pilot probe unit contains a plurality of resiliently-mounted convex projections such as balls, which are spaced apart both circumferentially and longitudinally with respect to the pilot probe unit. The balls are mounted in transverse openings in the pilot unit. The spring-loaded projections serve to center the pilot unit and welding apparatus more quickly and accurately within a tube being electric arc welded to a tubesheet. Alternatively, a pilot probe unit having a plurality of transverse grooves can be used for welding tubes which are essentially round.
REFERENCES:
patent: 3783230 (1974-01-01), Peyrot
patent: 4142084 (1979-02-01), Torrani
patent: 4427868 (1984-01-01), Kazlauskas
patent: 4476367 (1984-10-01), Kazlauskas
patent: 5239154 (1993-08-01), Puls
Foster Wheeler Energy Corporation
Naigur Marvin A.
Shaw Clifford C.
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