Note: Pre-heating a steel plate and a carriage roller shaft

Objective:

To pre-heat a steel plate and a carriage roller shaft for a welding application 

End Product:

Steel plate

Equipment:

Ambrell EASYHEAT 10 kW, 150-400 kHz induction heating power supply with a remote workhead containing two 1.0‚ μF capacitors
A single-position, two-turn pancake induction heating coil designed and developed for this application 

Materials:

Steel plate
Carriage roller shaft

Temperature:

300 °F (149 °C)

Frequency:

259 kHz

Testing:

The carriage roller shaft was placed on the 0.5” (13 mm) thick steel plate and positioned in the center of the pancake coil. The power was turned on and the parts began to heat. It was noticed that after 32 seconds the parts achieved temperature. In order to provide more heat to the plate (instead of the carriage roller shaft), the coil  must be adjusted to be closer to the plate. With that adjustment, both parts can be heated to roughly the same temperature. The client was using a torch, but induction will increase their output as it enables preheating while welding. 

Benefits:

  • Speed: Induction was able to achieve the client’s targeted speed/production rate; additionally induction opens up the possibility of preheating while welding
  • Repeatability: Induction was able to achieve an identical result consistently
  • Energy savings: Induction is a more efficient heating method than torch heating 
Pre-heating a steel plate and a carriage roller shaft

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