Electric heating – Metal heating – Of cylinders
Patent
1990-05-25
1992-08-18
Shaw, Clifford C.
Electric heating
Metal heating
Of cylinders
219 60R, 219 61, B23K 1301
Patent
active
051401231
ABSTRACT:
A continuous manufacturing method for a metal welded tube and a manufacturing apparatus therefor, which obtains a tubular member by continuously passing a metal band coil through molding rollers, guides the tubular member to abutting rollers to bring the edges thereof in slight contact with each other so as to form a V-throat having the vertex of an edge contact portion at the upstream side of the abutting rollers, disposes an inductor of a high frequency preheating unit aiming at edge preheating at the outer periphery in front of the abutting point of the V-throat and at need disposes an impeder also at the inner surface of the V-throat, and further disposes welding torches in a single or double rows of a welding unit for melting and welding the tubular member by welding high density energy at the upstream side of the abutting rollers including the line connecting the centers thereof.
REFERENCES:
patent: 3270176 (1966-08-01), O'Neill et al.
patent: 3294928 (1966-12-01), Schafer
patent: 3585337 (1971-06-01), Rudd
patent: 3707257 (1972-12-01), Wogerbauer et al.
patent: 4339938 (1982-07-01), Nakagawa et al.
patent: 4709845 (1987-12-01), Akiyama et al.
Kusakabe Electric & Machinery Co. Ltd.
Shaw Clifford C.
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