Method and apparatus for welding tapered metal poles

Details Method and apparatus for welding tapered metal poles Method and apparatus for welding tapered metal poles

1982-09-30

1985-04-02

Envall, Jr., Roy N.

Electric heating

Metal heating

Of cylinders

219 6111, 219 6113, 219 613, 219 67, B23K 1132

Patent

active

045089493

ABSTRACT:
Methods and apparatus for manufacturing tapered, hollow metal poles which can be used for manufacturing poles of various lengths, tapers and cross-sectional dimensions with the same apparatus. A substantially complete, tapered tube is formed from a plate or sheet of metal having lips at its longitudinal side edges which extend transversely to the major surface of the plate or sheet. The tube is guided at its lip portions to a weld point where pressure is applied to force the lips together by a grooved roller which applies pressure to the oppositely facing surfaces of the lips in directions transverse to such surfaces. The lips are spaced in advance of the weld point, and high frequency, electric heating current is supplied to the tube at opposite sides of the gap between the lips to heat the tube at the lips to welding temperature as it is advanced to the weld point.

REFERENCES:
patent: 2629806 (1953-02-01), Anderson
patent: 3234352 (1966-02-01), Morris et al.
patent: 3648008 (1972-03-01), Kawato et al.

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