Induction Annealing Stainless Steel Tubes With High Frequency Heating Equipment
Objective To anneal a Ā¼ā area around an oval cutout on a stainless steelĀ tube prior to extrusion
Material .75ā (19mm), 1.5ā (38.1mm) and 4ā (101.6mm) diameter steelĀ tubes
Temperature 1900 ĀŗF ( 1038 ĀŗC)
Frequency 300 kHz
Equipment ā¢ DW-UHF-20kW induction heating system, equipped with aĀ remote workhead containing one 1.0Ī¼F capacitor.
ā¢ An induction heating coil designed and developedĀ specifically for this application.
Process A single turn helical coil is used on the 4ā (101.6mm) diameterĀ tubes and a two turn helical coil is used on the smallerĀ diameters. The coil is placed over the oval cutout and power is
supplied for 15 seconds to anneal a .25 (6.35mm) diameterĀ around the cutout.
Results/Benefits Induction heating provides:
ā¢ Precise and controllable placement of heat to anneal onlyĀ the required area
ā¢ Faster process than flame
ā¢ Repeatable results
ā¢ Hands-free heating that involves no operator skill forĀ manufacturing
