Note: Preheating Rod Assemblies for Welding
Objective:
To preheat steel rod assemblies for welding
End Product:
Steel rods
Equipment:
Ambrell EKOHEAT 10 kW, 50-150 kHz induction heating system with a workhead and coil specifically designed for this application
Materials:
Multiple magnetic steel assemblies
Temperature:
204 °C (400 °F)
Frequency:
109 kHz
Testing:
Background: This is an automotive industry application. The client had been using torches for preheating. However, due to process improvements thanks to new automation in their facility, torch heating became too slow. This resulted in a backlog that kept them from maximizing their throughput.
Temperature indicating paint was applied to the part, which dissolves when the part reaches the target temperature. It took 45 to 75 seconds to heat each part to temperature, depending on part size. The height of the coil relative to the joint area is a critical consideration for this application. The distance impacts how uniformly both sides of the joint heat
Benefits:
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Speed: The torch couldn't keep up with new heating time requirements, but induction was able to meet and exceed them.
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Precision: Induction offers more precise heating than a torch.
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Repeatability: With induction, the client can expect to see the same result every time a part is heated.
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Throughput: The reduced heating time enables the client to enjoy improved throughput and fully realize the efficiency gains from their investment in automation.
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