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Whole tube annealing
The modern tube industry prefers heating by induction for stress-relieving or whole-body annealing, over the conventional oil / gas-fired furnaces, for obvious advantages.
Large saving in energy, consistent output temperature, suitability for automatic handling, suitability for intermittent operations, quick start-up are some major benefits.
Whole-tube annealing installations are used where annealing between 'drawing' operations are required.
In these machines the entire body of the tube is uniformly heated to the required temperature as the tubes pass through the induction coil.
These machines consist of
- an input magazine where the raw tubes are loaded by the user
- a release mechanism to release one tube at a time on the input, powerised roller conveyor
- a multiple pinch-roll drive to grip the tube and move it forward through the induction coil
- a coil assembly with quick release power and water connections
- powerised roller conveyor at the output section, and
- diverter to divert the annealed tubes to the exit magazine.
The length of the line decides the soaking and cooling time available for the tube.
GH also offer temperature monitoring by infrared pyrometer.
Shrouding with thermal insulation, protective atmosphere of nitrogen or cracked ammonia gas possible.
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