Note: Preheating a molybdenum anode (stress relief)
Objective:
Preheating a molybdenum anode for x-ray tubes to 752 °F (400 °C) for stress relief
End Product:
Molybdenum anode
Equipment:
Ambrell 4.2 kW induction heating system, equipped with a remote workhead containing one 1.0 μF capacitor.
An induction heating coil designed and developed specifically for this application.
Materials:
2.5 in (63.5 mm) diameter molybdenum tube welded to a 5 in (127 mm) diameter flange
Temperature:
752 °F (400 °C)
Frequency:
215 kHz
Testing:
A four-turn helical pancake coil is used to heat the anode. The area on the anode to be preheated is the weld between the tube and flange. The part is placed in a fixture and placed in the coil. Power is applied for 1 minute to reach 752 °F (400 °C).
Benefits:
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Integrates easily into existing production lines
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Faster production rates, increased production
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Flameless process
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Precise and controllable placement of heat
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Even distribution of heating
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