Internally and externally enhanced wielded tube

Details Internally and externally enhanced wielded tube Internally and externally enhanced wielded tube

1995-05-24

1998-03-24

Scherbel, David

Pipes and tubular conduits

Longitudinally seamed

Permanent type seam

138 38, 138142, 138177, F16L 917

Patent

active

057301891

ABSTRACT:
An externally and internally enhanced welded tube formed from a strip having a thickness b. The tube includes an inner wall enhanced with a first desired pattern having a thickness of a. An outer wail is enhanced with a second desired pattern, the second desired pattern having a thickness c. The weld fusing a portion of adjacent longitudinal edges of the strip wherein a weld bead associated with said weld is recessed within said desired patterns, does not extend beyond said desired patterns, and the length of said portion of said adjacent longitudinal edges that is fused together is from about (b+0.05a+0.05c) to about (b+0.2a+0.2c).

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