Method for the manufacture of internally enhanced welded tubing
AssigneeOlin Corporation
InventorsMyron R. Randlett, Jerome M. Dupy
Life of this patent
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Abstract
There is provided a method for the manufacture of a welded tube having an enhanced inner wall. A fin insert shapes the edges of a metallic strip prior to welding and minimizes the formation of a weld bead inside the tube. The portion of the edge of the metallic strip adjacent the outer surface of the tube is formed to a first angle, while that portion of the edge adjacent an inner wall of the tube is formed to a second, lesser angle.
Claims7
A method for the manufacture of a heat exchange tube formed from a metallic strip having opposing first and second surfaces and opposing longitudinal edges joined by a longitudinally running weld bead, comprising the steps of:
- a) forming a pattern on said second surface of said metallic strip;
- b) forming said metallic strip into an ellipse with said second surface forming an inner wall;
- c) shaping, with a fin insert, the opposing longitudinal edges of said metallic strip to:
- (i) a first angle adjacent said first surface,
- (ii) a second angle adjacent said second surface, said first angle and said second angle being measured relative to a center line axis which runs perpendicular to said longitudinally running weld bead, and
- (iii) an inflection zone connecting said first angle and said second angle wherein said inflection zone is closer to said center line axis than said shaped opposing longitudinally edges;
- d) contacting said shaped opposing longitudinal edges of said metallic strip;
- and
- e) welding said shaped opposing longitudinal edges together.
Dependencies are inferred from the claim text.