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US 4,383,163 AGranted
Method of manufacturing a heat exchange tube with internal surface enlarging elements
AssigneeGotaverken Anteknik AB
InventorBertil H. Sjoholm
Life of this patent
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Abstract
The invention relates to a tube with surface-enlarging elements attached to the inside thereof, which elements are in the form of radially inwardly directed pins welded on the tube wall. A method for forming such a tube also is provided, the method comprising inserting a holder for each pin into the tube and moving the holder outwardly to press the pin against the tube wall while welding the pin thereto.
Claims4
A method of manufacturing a heat conducting member in the form of a tube provided with surface enlarging pin elements at its internal wall face, comprising the steps of:
- mounting said tube on a support;
- arranging a plurality of elongate pin holders in an annular group, each of said holders having a length sufficient to position a pin at any desired location along said tube;
- placing a pin in each of said holders generally transverse to the length of said holders;
- inserting said holders into said tube to a desired depth and position where said pins are to be attached;
- applying an outwardly directed force to said holders to bring one end of each of said pins into contact with said internal wall face;
- passing a welding current through said pins and the areas of contact at said wall face, while continuing to press said pins against said wall face;
- detaching said holders from said pins and removing said holders from said tube;
- and
- repeating the above pin positioning and welding steps for each group of pins to be attached to said internal wall face.
6 more elements
Dependencies are inferred from the claim text.