Process for producing large-sized rectangular or square steel pi

Details Process for producing large-sized rectangular or square steel pi Process for producing large-sized rectangular or square steel pi

1979-11-13

1981-11-17

Mayewsky, Volodymyr Y.

Electric heating

Metal heating

Of cylinders

72 52, 219 85, 219 591, 228146, 228173F, B23K 3106

Patent

active

043013481

ABSTRACT:
A process for producing large-sized square steel pipe includes the steps of continuously paying off steel plate from a roll of the same, removing strain from the plate while conveying the plate, and cutting the plate to predetermined lengths. The lengths of plate are successively bent into a shape resembling a rectangular or square pipe having corner portions with angles slightly larger the 90.degree.. The successive plates are tack-welded and opposed outer rollers are pressed against the outer sides of the plate while the plate is conveyed longitudinally thereof. The opposed edges of the plate are thereafter welded together by high frequency welding.

REFERENCES:
patent: 3230336 (1966-01-01), Gueugnier
patent: 3337944 (1967-08-01), Morris
patent: 3603761 (1971-09-01), Wogerbauer

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