Annealing lip on cryogenic dewar

Objective

Annealing a 1” lip on aluminum cryogenic dewar that has been work hardened during the process of spin forming. 

End Product

Aluminum dewar

Equipment

• Ambrell 3.5 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

Aluminum dewar, lip has a 3.24” (82.3mm) ID and is 0.05” (1.3mm) thick 

Temperature

800 ºF (427 ºC)

Frequency

303 kHz

Testing

A two turn helical coil is used to heat the lip on the cryogenic dewar. The dewar is placed in the coil and power is applied for 2 minutes to anneal the required 1” heat zone. 

Benefits

Induction heating provides:

• Hands-free heating that involves no operator skill for manufacturing

• Fast, controllable, accurate heating

• High efficiency, low energy cost

• Even distribution of heating 

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