Induction coil

その Induction Coil is a critical component in a High Frequency (HF) Welding Machine, primarily used for pipe and tube welding. It generates a high-frequency electromagnetic field that induces eddy currents in the pipe's edges, causing them to heat up and fuse under pressure—without direct contact.

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✅ 1. Introduction

その Induction Coil is a critical component in a High Frequency (HF) Welding Machine, primarily used for pipe and tube welding. It generates a high-frequency electromagnetic field that induces eddy currents in the pipe's edges, causing them to heat up and fuse under pressure—without direct contact.


✅ 2. 製品詳細

  • Product Name: Induction Coil / Welding Coil

  • 応用: Seam welding of steel, stainless steel, aluminum, and copper tubes or profiles

  • Frequency Range: 100 kHz – 800 kHz (typically)

  • Cooling Type: Water-cooled (inner copper tube or spiral structure)

  • Compatibility: Solid-state and vacuum tube HF welders


✅ 3. Main Components

  1. Induction Loop / Copper Coil – Forms the electromagnetic field

  2. Cooling Tube – Circulates water to prevent overheating

  3. Support Housing – Provides insulation and structural integrity

  4. Connection Terminals – Interface with the HF generator

  5. Ferrite Cores (optional) – Improve magnetic field focus and efficiency

  • induction coil
  • induction coil

 

  • induction coil
  • induction coil1

✅ 4. Comparison of Induction Coil Types for HF Welding

Coil Type Structural Features Application Scenarios 利点 デメリット
Spiral Coil Multiple turns of round or oval copper tube Small to medium pipe diameters Uniform heating, widely applicable Less efficient for large-diameter pipes
U-Shaped Coil U-shape copper tube, open side faces weld seam Medium-diameter pipes, focused heating Focused seam heating, fast welding Limited heating area, needs precise alignment
Saddle-Type Coil Shaped like a saddle to fit the pipe contour Large-diameter or shaped tubes Wide heating area, suitable for irregular shapes Complex design, higher cost
Ferrite Core Coil With ferrite cores to enhance magnetic focusing High-efficiency HF welding Increases heating efficiency, reduces energy loss Ferrite is fragile, requires careful handling
Adjustable Coil Adjustable structure to fit various pipe sizes Multi-size production lines Highly flexible and versatile Complex structure, requires experienced handling

📌 Selection Tips

  • Small pipes (<50 mm): Spiral coil is recommended for its simplicity and cost-effectiveness.

  • Medium pipes (50–150 mm): U-shaped coils offer efficient, focused heating.

  • Large or irregular pipes (>150 mm): Saddle coils cover a wider area and handle complex profiles.

  • High-efficiency requirements: Ferrite core coils help reduce energy loss and improve heat focus.

  • Versatile production lines: Adjustable coils are ideal for lines requiring flexibility in pipe diameters.

✅ 5. 動作原理

  1. The HF generator sends current to the induction coil.

  2. A strong high-frequency magnetic field is created around the coil.

  3. As the pipe passes through the coil, eddy currents are induced at the edge surfaces.

  4. These currents generate localized heat at the pipe’s seam (skin effect + proximity effect).

  5. When the pipe edges reach the fusion point, squeeze rollers press them together to form a solid weld without filler material.


✅ 6. Technical Parameters (Typical Values)

Parameter Value Range
Frequency Range 100 – 800 kHz
Input Power Capacity 50 – 600 kW (depends on system)
Coil Inner Diameter 20 mm – 300 mm (customizable)
Coil Type Spiral, U-shape, Saddle, or Custom Form
Cooling Method Water Cooling (2–5 L/min)
Max Operating Temperature ~200–300°C (with active cooling)
Coil Material High-purity copper with insulation

✅ 7. まとめ

  • その induction coil is a key part of HF welding, enabling non-contact, high-speed seam welding for pipe production.

  • Coil shape and size are customizable to match pipe diameter and welding specifications.

  • High durability, excellent thermal conductivity、 そして magnetic field efficiency are critical for stable, continuous production.

  • Proper cooling and maintenance significantly extend coil life and welding consistency.

 

  1. セクション機器を入力
  2.  
  3. 1. コイルカーとストレージ
  4. 2.シングルヘッドとダブルヘッドのアンコイラーと油圧と空気圧のアンコイラー
  5. 3.ピーラーとロールアームを押さえる
  6. 4.平坦化機
  7. 5.自動および半自動せん断機と突合せ溶接機
  8. 6.垂直ケージアキュムレーター&水平ループアキュムレーター&ランディング水平スパイラルループアキュムレーター

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仕上げセクション
 
  1.  
  2. 1. 渦電流検査装置
  3. 2. Seam annealing machine
  4. 3. Straightener machine
  5. 4. Chamfer and end facer machine
  6. 5. Hydro Tester machine
  7. 6. Threading machine
  8. 7. Painting and oil machine
  9. 8. Automatic bundle and package machine

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スペアパーツとコンスブルパーツ
 
  1.  
  2. 1. ローラー、金型、ダイ、D2、D3材質を選択
  3. 2. Ferrite, Impeder, Fiberglass tube
  4. 3. HSS saw blades, TCT Saw blades, Friction saw blades
  5. 4. OD burr remove inserts, ID burr remover inserts
  6. 5. HF welder Induction Coil and other HF welder spare parts
  7. 6. Copper tube for induction Coil, PTFE pipe for Induction Coil
  8. 7. Mosfet, Boards
  9. 8. Steel pipe Strapping machine
  10. 9. Zinc Spray Machine, Zinc wire, Zinc spray gun

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証明書
 

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  3. 2.スパイラルベベルギア、ドラムギアカップリングおよび浸炭。 ギア歯の焼入れ。 駆動システムは安定性、効率性、装着性、低ノイズを実現。

  4. 3.高精度、耐摩耗性、工具の長寿命。 すべての機械旋盤、キー溝は CNC によって位置決めおよびフライス加工されます。

  5. 4.品質部門は原材料の品質を確認し、機械が完璧に稼働することを保証します。

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  1. 1. 出荷前に機械テスト実行ビデオを顧客に提供します。
  2. 2.オンライン技術サポート リフト全席無料.
  3. 3.Professional engineers team to install the machine,  train your employee well.
  4. 4. 1 年間の保証と生涯にわたる技術サポート。
  5. エンジニアの対応には5~24時間かかります。
  6. 6. お客様と当社とのビジネス関係はいかなる第三者に対しても秘密にされます。
  7. 7.  We welcome customers to visit our factory anytime.

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Induction coil FAQs

What is an induction coil in a welding machine?

It’s a copper conductor shaped into a loop or saddle that generates a high-frequency electromagnetic field to heat the edges of metal pipes for seam welding.

What materials are induction coils made of?

High-conductivity copper (often hollow for water cooling), sometimes enhanced with ceramic insulation or ferrite cores.

Are coils standard or custom-made?

They are typically custom-made based on pipe diameter, welding frequency, and power level.

How does the coil heat the pipe?

The coil induces eddy currents in the pipe surface using high-frequency AC. The resistance of the pipe material converts this into localized heat (due to the skin and proximity effects).

What’s the ideal distance between the coil and the pipe?

Usually 1–3 mm. Too close can cause arcing; too far reduces efficiency.

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