Note: Anneal an oval cut-out on a stainless steel tube

Objective:

To anneal an area around an oval cutout on a stainless steel tube prior to extrusion 

End Product:

tube

Equipment:

  • Ambrell 10kW 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:

.75 in  (19mm), 1.5 in  (38.1mm) and 4 in  (101.6mm) diameter steel tubes

Temperature:

1900 °F (1038 °C)

Frequency:

300 kHz

Testing:

A single turn helical coil is used on the 4 in  (101.6mm) diameter tubes and a two turn helical coil is used on the smaller diameters. The coil is placed over the oval cutout and power is supplied for 15 seconds to anneal a .25 (6.35mm) diameter around the cutout.

Benefits:

Induction heating provides:

  • Precise and controllable placement of heat to anneal only the required area

  • Faster process than flame

  • Repeatable results

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

Anneal an oval cut-out on a stainless steel tube

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