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Ferrite VS Impeder: Key Differences in ERW Tube Mill
Aug . 21, 2025 10:43
1. Ferrite Rod
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Nature: A ferrite made of ferrite material.
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Function: Mainly used to change the distribution of the electromagnetic field, increase inductance, and concentrate magnetic flux.
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Application in HF Tube Welding: Inserted inside the tube, it focuses the welding current on the seam edges, improving welding efficiency and reducing energy loss.
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Features:
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It is only a material or semi-finished product
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Can be made in different shapes (rod, tube, block)
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Needs to be combined with copper sleeves, water-cooling sleeves, etc., for use in tube mills
2. Impeder
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Nature: A complete device composed of ferrite rods + water-cooling tube + protective sleeve.
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Function: Installed inside the tube at the welding position of the tube mill, it prevents HF current from spreading, forcing the current to concentrate at the seam edges.
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Components:
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Inside: Ferrite rod (core material)
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Shell: Stainless steel or fiberglass sleeve (for protection)
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Cooling: Copper or stainless-steel tube for water-cooling
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Features:
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An application product of ferrite rods
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Can be customized according to tube size, frequency, and power
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Performance and lifetime depend directly on ferrite quality
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3. Summary of Differences
| Comparison | Ferrite Rod | Impeder |
|---|---|---|
| Definition | A magnetic material (Ferrite), a component | A complete device used in tube mills |
| Function | Concentrates magnetic field, increases inductance | Concentrates HF current at the seam, improves welding efficiency |
| Form | Rod, tube, block | Assembly containing ferrite rod |
| Directly usable | Cannot be directly used in tube mills | Can be directly installed and used |
| Relationship | Core raw material of impeder | Application product of magnetic rods |
👉 In short:
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Ferrite rod is the “raw material”
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Impeder is the “finished tool”
The ferrite rod is placed inside the impeder, which is then used in the tube mill.
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