Objective
Uniformly high frequency annealing copper tubes simultaneously to 800°F (426°C) in under 10 seconds with induction heating.
Equipment
DW-HF-45kw induction heater
Helical coil
Material
• Two copper tubes
– OD: 0.69’’ (1.75 cm)
– ID: 0.55’’ (1.40 cm)
– Length: 5.50’’ (14.0 cm).
Key Parameters
Power: 27kW
Temperature: 842°F (450°C)
Time: 5 sec
Helical coil
Material
• Two copper tubes
– OD: 0.69’’ (1.75 cm)
– ID: 0.55’’ (1.40 cm)
– Length: 5.50’’ (14.0 cm).
Key Parameters
Power: 27kW
Temperature: 842°F (450°C)
Time: 5 sec
Process:
- The two copper tubes were placed together in the coil.
- Induction heating was applied for 5s.
- Improved process control for uniform induction heating to a desired temperature
- Power on demand and rapid, consistent heat cycles
- Technology without pollution, which is both clean and safe
Induction Annealing Stainless Steel Tubes With High Frequency Heating Equipment
Objective To anneal a ¼” area around an oval cutout on a stainless steel tube prior to extrusion
Material .75” (19mm), 1.5” (38.1mm) and 4” (101.6mm) diameter steel tubes
Temperature 1900 ºF ( 1038 ºC)
Frequency 300 kHz
Equipment • DW-UHF-20kW induction heating system, equipped with a remote workhead containing one 1.0μF capacitor.
• An induction heating coil designed and developed specifically for this application.
Process A single turn helical coil is used on the 4” (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.
Results/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
