Induction welding is also used to make finned tubes for heat exchangers. The finning process is done by high-speed succession welding of spiral fins to a carbon steel tube. Unlike conventional tube welding, high-frequency power injection is done using gliding contacts on the tube and the fin. Compared to other types of welding, this process doubles a system's productivity.
Induction welding offers some advantages over conventional welding techniques, which makes the process more productive:
• Precise heating area (fewer heat-affected zones)
• Shorter heating times (lower energy consumption)
• Low maintenance
• High-quality even welding
• Option to weld non-scoured strips.
One of the main applications for induction is welding for tubes and other closed profiles made of steel, aluminum or copper. Wheels are used to deform flat strips into the desired shape. The wheels guide the blank, which moves through a ring-shaped inductor and the induced currents generated move across the lips of the tube to the point of contact.
Fives installations are typically equipped with high-frequency generators using several hundred kW and MOS transistors technology (High Power CELES MP range for frequencies of up to 400 kHz at high powers and the CELES MP for frequencies of up to 2 MHz at lower powers).
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