PTFE Pipes for High-Frequency Welded Pipe Machines - Quality China Suppliers & Factory Solutions

The induction coil is supplied with a very high-frequency electrical current. Since copper tubing is used and cooling water flows directly inside (regular water conducts electricity), the high voltage could flow through the water and into the grounded steel pipe, resulting in:

• Electrical breakdown
• Arc discharge
• Short circuits to ground
• Equipment damage or safety risks

PTFE, which is commonly known as Teflon, is a superior electrical insulator. As a liner, it completely isolates conductive cooling water from the copper wall, ensuring high-frequency current remains fully contained within the coil.

During welding, temperatures at the weld seam can exceed 1,000°C, transferring intense radiant heat to the induction coil. Copper transfers heat extremely efficiently. Without insulation, heat could rapidly reach the cooling water, causing:

• Localized boiling
• Vapor formation
• Fluctuating cooling efficiency
• Risk of overheating, steam blockage, or coil burnout

Thanks to its excellent high-temperature resistance and low thermal conductivity, the PTFE tube acts as a thermal barrier, stabilizing cooling performance.

The PTFE tube also helps maintain a stable flow path inside the induction coil. By occupying the center of the copper tube, it ensures cooling water flows uniformly around it, preventing turbulence, stagnation, or uneven cooling caused by pipe curvature. This improves thermal control and prevents localized overheating.