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PTFE Pipes Used In High-Frequency Welded Pipe Machines
Product Description
The PTFE tube may look small, but its effect is vital in a high frequency welded pipe mill. It is designed to be used as the inner lining of the induction coil (the copper tube), which provides insulation, heat resistance, and internal alignment.
You can consider it as the “insulated inner liner” for the induction coil.
Core Function — Internal Protection for the Induction Coil
In a high-frequency welding system, the induction coil is a hollow copper tube through cooling water flowing sustainingly to hold back overheating. The copper coil is filled with PTFE tube.
Its main functions are as follows:
1. Electrical Insulation — Preventing Coil-to-Pipe Short Circuits
The induction coil is supplied with a very high-frequency electrical current.
Copper tubing used and cooling water flowing 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.
Copper tubing used and cooling water flowing directly inside (regular water conducts electricity), the high voltage could flow through the water and into the grounded steel pipe, resulting in:
2. Thermal Protection — Preventing Water Boiling and Vapor Lock
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.
3. Centering and Flow Guidance — Ensuring Uniform Water Circulation
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.
No other material provides this combination of electrical safety, thermal stability, and durability.
Why PTFE Is the Only Suitable Material
PTFE is chosen because it meets all demanding operational conditions:
| Performance Requirement | PTFE Capability |
| Electrical insulation | Excellent, non-conductive |
| Heat resistance | aging resistance, reinforced grade, Wear Resistance |
| Grade | Long-term working up to 250°C |
| Low friction and smooth surface | Prevents scaling and water blockage |
| Chemical resistance | Does not react with water or additives |
Machine Parameters
| Product Name | PTFE tube/ PTFE pipe |
| Color | Natural White, milk white, semi-clear, clear or Customized |
| Feature | aging resistance, reinforced grade, Wear Resistance |
| Grade | hollow grade, extrusion grade |
| Size | 2mm,4mm,6mm,8mm,10mm,12mm, customized |
| Warranty | 1 Year |
ERW pipe production Flow chart
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