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Typical Bend Formations for Tubular Heaters
Forming Tubular ElementsThe
MgO insulation used in tubular heating elements is compacted by reducing
the element diameter. The elements are then annealed in a controlled
atmosphere furnace to relieve the metal stressing (work hardening) that
takes place during the rolling to size reduction of the sheath.
Annealing brings the metal back to a soft state, allowing the element to
be bent virtually into any configuration. However, since forming also
work hardens the metal, some precautions must be observed in order to
prevent the sheath from breaking during bending or developing stress
cracking marks.
Avoid bends within a minimum of 1/2" of the terminal pin and resistance wire junctions unless the bending radius is a minimum 3" (75 mm). Tubular Element Minimum Bending Radius
Note: Smaller inside
bending radius than listed in the table can be factory accomplished. It
requires special forming techniques to prevent damage to the tubular
heater. Consult ISE with your requirements.
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