PTFE Pipes for High-Frequency Welded Pipe Machines - China Suppliers and Factory Solutions
Product Description
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:
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.
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.
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
| Parameter | Specification |
|---|---|
| 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 function of a 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 vital electrical insulation, high heat resistance, and helps maintain internal flow alignment for the cooling water.
How does the PTFE tube prevent electrical short circuits in the coil?
Since high-frequency current runs through the copper tubing and cooling water conducts electricity, high voltage could flow to the grounded steel pipe. PTFE (Teflon) is a superior insulator that completely isolates the conductive cooling water from the copper wall, preventing electrical breakdown, arc discharge, and short circuits.
Why is thermal protection necessary for the induction coil?
Welding temperatures can exceed 1,000°C, transferring extreme radiant heat to the coil. Without PTFE's low thermal conductivity acting as a barrier, the cooling water inside the copper tube could boil rapidly, causing vapor lock, uneven cooling, and potential coil burnout.
How does the PTFE tube improve cooling water flow?
By occupying the center of the copper tube, the PTFE tube guides the cooling water to flow uniformly around it. This prevents turbulence, stagnation, or localized overheating caused by the curvature of the coil.
What sizes and parameters are available for these PTFE tubes?
The tubes come in hollow/extrusion grades with sizes including 2mm, 4mm, 6mm, 8mm, 10mm, 12mm, and customized options. They are available in natural white, milk white, semi-clear, or custom colors, and carry a 1-year warranty.
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