Method of spot annealing tubing
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
May 15, 1984
Issued Date -
N/A
app pub date -
Dec 15, 1982
filing date -
May 6, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In the manufacture of tubing, and particularly finned tubing, for use by the heat transfer industry in the manufacture of heat exchangers, annealed ends and lands are desirable in certain applications to facilitate the assembly of the tubes to headers and baffles by expanding techniques. Such spot-annealed portions can be produced on a continuous basis by the described apparatus and method in which the moving tube is passed through a heating chamber which reciprocates on a carriage in the direction of tube movement. The heating chamber has a pair of power-actuated, current-carrying clamps which grip spaced portions of the tube so as to resistance-heat the tube portion between the clamps. The heating chamber and carriage move with the tube while it is clamped to provide sufficient heating time. The carriage then returns to its starting position. If desired, an inert gas can be supplied to the heating chamber to prevent oxidation and/or discoloration. Also, if desired, a quench can be supplied in a secondary chamber positioned on the carriage immediately downstream of the heating chamber to prevent post-oxidation of the annealed tube.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully