Hot Products

Products Categories

High Precision Steel Pipe Mill for Fu...

Low Carbon Steel ERW Pipe Making Machine

Precision Steel Tube Mill Line

High Frequency Welding Pipe Making Ma...

High Quality Carbon Steel Pipe Making...

Automatic ERW Carbon Steel Tube Mill

Mild Steel Pipe Making Machine

Round Carbon Steel Manufacturing Machine

Customized Square Welded Steel Tube Mill

High Speed Steel Pipe Manufacuring Ma...

0102030405

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

The PTFE tube, though compact, plays a crucial role in high-frequency welded pipe mills. Manufactured in China, this essential component serves as the inner lining of the induction coil (copper tube), ensuring superior insulation, exceptional heat resistance, and precise internal alignment. As a leading supplier in the industry, our factory produces PTFE tubes that meet the highest standards, making them indispensable for efficient pipe welding processes.

Product Details

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.

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

Frequently Asked Questions (FAQ)

What is the main function of the PTFE tube in a high frequency welded pipe mill?

The PTFE tube acts as an insulated inner liner inside the copper induction coil. It provides critical electrical insulation to prevent short circuits, offers high-temperature thermal protection, and guides cooling water flow uniformly to prevent overheating.

Why is electrical insulation necessary inside the copper induction coil?

Since high-frequency current runs through the coil and cooling water flows inside it, regular water conducts electricity. The PTFE tube acts as a superior electrical insulator, isolating the conductive water from the copper wall to prevent electrical breakdown, arc discharges, and short circuits to the grounded steel pipe.

How does the PTFE tube protect the system from extreme heat?

Welding temperatures can exceed 1000°C. With its high-temperature resistance of up to 250°C and low thermal conductivity, the PTFE tube acts as a thermal barrier. This prevents cooling water from boiling, forming vapor, or causing steam blockages and coil burnout.

What size options are available for these PTFE tubes?

The standard size offerings include 2mm, 4mm, 6mm, 8mm, 10mm, and 12mm. Customized sizes can also be manufactured according to specific machine requirements.

What makes PTFE superior to other materials for this application?

PTFE is the only material that simultaneously provides high electrical insulation, long-term heat resistance up to 250°C, low friction to prevent scaling and water blockage, and chemical resistance to prevent reaction with water or additives.

Inquire Now!

For inquiries about our products or pricelist, please leave your email to us and we will be in touch within 24 hours.