Induction Heating Machine for Fast and Efficient Metal Heating

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Steel pipe seam annealing machine

The steel pipe seam annealing machine is a key piece of heat treatment equipment in welded pipe production lines. It is primarily used to anneal the weld seam of steel pipes after welding, eliminating welding stress, improving microstructure, enhancing corrosion resistance, and extending service life. This equipment is especially suitable for continuous production of stainless steel pipes, titanium alloy pipes, and other high-requirement metal tubes.

Product Details

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Product Details

Product Description

1. Introduction

2. Working Principle

Induction Annealing Principle:

Induction Heating: A high-frequency or medium-frequency power source generates an alternating magnetic field through induction coils, which induces eddy currents in the weld seam area, causing localized heating.
Precise Temperature Control: Infrared pyrometers or thermocouples provide real-time closed-loop temperature control to maintain the weld seam at a set annealing temperature (typically 950°C–1100°C).
Rapid Cooling: After heating, air or water cooling is applied to rapidly cool the seam, promoting the desired metallurgical transformation.

3. Basic Technical Data (Typical)

Item	Typical Range
Applicable Pipe Diameter	Φ10 mm ~ Φ168 mm
Applicable Wall Thickness	0.4 mm ~ 5.0 mm
Annealing Temperature Range	850°C ~ 1100°C
Output Frequency (Power Source)	50 kHz ~ 400 kHz (customized per pipe size)
Output Power	30 kW ~ 300 kW
Line Speed Compatibility	10 ~ 120 m/min
Heating Zone Length	100 mm ~ 300 mm (adjustable)
Temperature Control Accuracy	±5°C
Cooling Method	Air cooling / Water cooling
Control System	PLC + HMI (touchscreen interface)

4. Main Components

High- or Medium-Frequency Power Supply – Provides alternating current for induction heating.
Induction Coil – Custom-designed (ring or U-type) to surround the weld seam.
Support/Guiding Structure – Ensures pipe stability during the annealing process.
Temperature Sensor – Infrared or thermocouple sensors for accurate weld temperature feedback.
Cooling System – Air or water cooling units to rapidly reduce temperature.
PLC Control System – Automates power, temperature, and speed adjustments.
Human-Machine Interface (HMI) – Allows the operator to monitor and set parameters.

5. Operation Details

Basic Operation Workflow:

Startup
- Check cooling system, power, air, and water connections.
- Launch the PLC and input preset parameters: temperature, speed, power level.
Heating Start
- Turn on the induction power; magnetic field is generated in the coil.
- Pipe is fed into the coil either automatically or manually.
Real-Time Temperature Control
- Infrared thermometer monitors the weld seam; system adjusts power automatically to maintain set temperature.
Cooling Process
- Weld seam enters the cooling zone for rapid temperature drop, forming desired microstructure.
Shutdown & Safety
- After process completion, turn off the power and cooling in sequence.
- Inspect coils, grounding, and pipes to ensure safe conditions.

Enter Section Equipments
1. Coil car and Storage
2.Single And Double Heads Un-coiler & Hydraulic And Pneumatic Un-coiler
3.Peeler and hold down roll arm
4.Flattening Machine
5.Automatic and Semi Auto Shearer & Butt Welder
6.Vertical Cage Accumulator & Horizontal Loop Accumulator & Landing Horizontal Spiral Loop Accumulator

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Spare Parts and Consumble Parts

1. Rollers, Moulds, Dies, D2,D3 material to choose
2. Ferrite, Impeder, Fiberglass tube
3. HSS saw blades, TCT Saw blades, Friction saw blades
4. OD burr remove inserts, ID burr remover inserts
5. HF welder Induction Coil and other HF welder spare parts
6. Copper tube for induction Coil, PTFE pipe for Induction Coil
7. Mosfet, Boards
8. Steel pipe Strapping machine
9. Zinc Spray Machine, Zinc wire, Zinc spray gun

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After-sales service

1.Machine test running videos will supply to customer before shipment.
2.Online techenical support WHOLE LIFT FREE.
3.Professional engineers team to install the machine, train your employee well.
4.One year warranty and life-long technical support.
5 .24 hours for engineer response.
6.Your business relationship with us will be confidential to any third party.
7. We welcome customers to visit our factory anytime.

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induction heating machine FAQs

What is induction heating?

Induction heating is a non-contact process that uses electromagnetic fields to heat electrically conductive materials. It generates heat directly within the workpiece by inducing eddy currents.

How does induction heating work?

A high-frequency alternating current passes through a copper coil, producing a magnetic field. When a conductive metal is placed inside this field, eddy currents form and resistive heating occurs inside the metal.

What materials can be heated by induction?

Mostly metals—such as steel, stainless steel, copper, aluminum, brass, and titanium. Non-conductive materials like ceramics or plastics cannot be directly heated but may be indirectly affected.

Is induction heating energy efficient?

Yes. It has up to 90% energy efficiency, significantly reducing energy waste compared to traditional methods like gas furnaces or resistance heating.

What cooling system is required?

Most machines require closed-loop water cooling or chillers to cool induction coils, power electronics, and transformers.

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