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High-Frequency Welded Pipe Machines PTFE Tubes - China Suppliers & Factory Quality Insulation Solutions
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:
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.
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.
Centering & 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
Frequently Asked Questions
What is the primary function of the PTFE tube in a high-frequency welded pipe mill?
The PTFE tube acts as an insulated inner liner for the induction coil (copper tube). It provides essential electrical insulation, thermal protection, and guides the internal flow of cooling water to ensure stable operation.
How does the PTFE liner prevent short circuits in the induction coil?
Since regular cooling water inside the copper tube conducts electricity, high voltage could flow through the water and ground into the steel pipe. As an outstanding electrical insulator, the PTFE tube completely isolates the conductive water from the copper wall, containing the high-frequency current.
Why is thermal protection necessary for the cooling water during welding?
Welding temperatures can exceed 1,000°C, transferring extreme radiant heat to the copper coil. Without the PTFE liner acting as a thermal barrier, the cooling water would boil rapidly, creating vapor locks, fluctuating cooling efficiency, and risking coil burnout.
What maximum temperature can the PTFE tube withstand?
The PTFE tube is designed for long-term working conditions with temperatures reaching up to 250°C, offering excellent heat resistance and thermal stability.
What sizes and colors are available for these PTFE tubes?
Standard sizes include 2mm, 4mm, 6mm, 8mm, 10mm, and 12mm, with custom dimensions available. Available colors include natural white, milk white, semi-clear, clear, or other customized colors.
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