Method and apparatus for making helically seamed tubing

Details Method and apparatus for making helically seamed tubing Method and apparatus for making helically seamed tubing

1976-12-13

1979-02-27

Smith, Al Lawrence

Metal fusion bonding

Process

With shaping

228 177, B21C 37083, B21C 3712, B23K 3106

Patent

active

041414810

ABSTRACT:
A thin perforate, helically wound welded edge tubing is used as a filter core for a roving wound filter. The slightly roughened external edges of the spirally formed welded joint greatly adds to the ability of securing the fiber roving to the tube and prevents relative slippage therebetween. Also, the invention comprehends an apparatus for, and a method of making the helically seamed tube by first drawing a sheet metal from a supply and raising two lateral edges thereof to form flanges. The material can be guided in a helical path by engaging the inside of the flanges so that the trailing edge abuts the leading edge. The abutted edges are heated so that the flanges themselves provide the filler for a weld on the exterior surface thereof. Drive rollers are provided to move the welded tube from the welding area and to torque the tube to prevent edge separation prior to the cooling of the weld.

REFERENCES:
patent: 886298 (1908-04-01), Johns
patent: 1294465 (1919-02-01), Horvath
patent: 2233233 (1941-02-01), Williams
patent: 3046382 (1962-07-01), Morris
patent: 3090336 (1963-05-01), Gruter
patent: 3174373 (1965-03-01), Gensman
patent: 3240177 (1966-03-01), Habdas
patent: 3356226 (1967-12-01), Miller et al.
patent: 3371770 (1968-03-01), Graham et al.
patent: 3487537 (1970-01-01), Lombardi
patent: 3997098 (1976-12-01), Van Petten

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