Rectangle Ferrite Rod for ERW Tube Mill

What Is a Rectangle Ferrite Rod?

A rectangle ferrite rod is a magnetic ceramic core installed inside the impeder. It works together with the high-frequency welder by guiding the magnetic flux to the strip edges where welding occurs.

Without a properly matched ferrite rod, more current is lost inside the tube body, reducing welding efficiency and increasing energy consumption. Choosing the correct ferrite rod is therefore essential for stable ERW production.

Main Functions

• Concentrates the high-frequency magnetic field

• Improves welding efficiency

• Reduces energy loss

• Enhances weld stability

• Protects overall impeder performance

Types of Ferrite Rods

Ferrite rods are available in several shapes to match different impeder designs and production requirements.

✅Rectangle Ferrite Rod

The most widely used type in ERW tube mills. Its rectangular profile provides excellent magnetic performance and efficient use of the impeder space, making it suitable for most production lines.

✅Round Ferrite Rod

Mainly used in smaller or specially designed impeders where a circular ferrite core is required.

✅Hollow Ferrite Rod

Designed for water-cooled impeders. The center hole allows cooling water to circulate while maintaining effective magnetic concentration.

✅Custom Ferrite Rod

Available in different widths, heights, lengths, and structures according to customer drawings or existing samples.

How to Choose the Right Ferrite Rod

The ferrite rod should be selected according to the actual production conditions rather than size alone.

Tube Diameter

Different pipe diameters require different impeder sizes, which directly affects the dimensions of the ferrite rod.

Wall Thickness

Thicker wall tubes require higher welding energy. A properly matched ferrite rod helps improve current concentration and welding efficiency.

Steel Material

Carbon steel, galvanized steel, and stainless steel have different welding characteristics. Selecting the correct ferrite specification helps achieve more stable welding performance.

Impeder Dimensions

The width and height of the ferrite rod must match the internal dimensions of the impeder. Proper fitting ensures the best magnetic effect and extends service life.

⭐The fastest way to select a ferrite rod is to provide your tube size, wall thickness, steel material, and the impeder dimensions or an existing sample.

Common Specifications

Rectangle ferrite rods are manufactured in various dimensions to suit different ERW tube mills. Among them, 45 mm × 20 mm is one of the most commonly used specifications, but it is not the only option.

AIS Machinery can produce ferrite rods according to your required:

If your equipment uses a non-standard specification, simply send us the drawing or dimensions for confirmation.

Custom Ferrite Rod Manufacturing

Every ERW tube mill has different impeder structures, so customized ferrite rods are often the best solution. Our engineering team can manufacture ferrite rods based on:

• ●Technical drawings

• ●Existing samples

• ●Impeder internal dimensions

• ●Tube production specifications

We also provide matching impeder casings and complete impeder consumable solutions.

Proven in Global ERW Tube Mill Projects

AIS Machinery has supplied rectangle ferrite rods, complete impeders, impeder casings, return impeders, and other HF welding consumables to customers in many countries. These products are widely used in ERW tube mills for carbon steel, galvanized steel, and stainless steel pipe production, with positive feedback for stable performance and reliable quality.

We Supply Complete Impeder Solutions

Instead of supplying only ferrite rods, we also provide a full range of matching components for high-frequency welding systems:

• Rectangle Ferrite Rod

• Round & Hollow Ferrite Rod

• Complete Impeder

• Return Impeder

• Impeder Casing 

• Ferrite Assemblies

• Other HF Welder & Impeder Spare Parts

Frequently Asked Questions

How do I know which ferrite rod I need?

Please provide the tube diameter, wall thickness, steel material, and impeder dimensions. Our engineers will recommend the suitable specification.

Is 45 × 20 mm the only size available?

No. It is the most common size, but we can manufacture other dimensions according to your impeder or drawing.

Can you manufacture non-standard sizes?

Yes. We regularly produce customized ferrite rods according to customer drawings, samples, and special dimensions.

Can I order ferrite rods together with the impeder casing?

Yes. AIS Machinery supplies both rectangle ferrite rods and matching impeder casings, ensuring proper dimensional compatibility.