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China Quality Assurance AC Copper Pancake Tubing Suppliers - Factory Direct Custom Copper Welding Solutions
Product Description
Generation of the High-Frequency Magnetic Field
The copper tube is bent into a specific shape (usually a U-shape or helical coil), which is tightly wrapped around the weld seam area of the steel pipe to be welded. The inside of copper tube is hollow.
High-current flow into this copper tube coil through water-cooled cables from the welder’s main power supply. Based on the principle of electromagnetic induction, there will be a intense and rapidly alternating magnetic field when the high-frequency current flows through the coil.
Induction of Eddy Currents in the Steel Pipe
This high-frequency magnetic field penetrates the steel pipe located at the center of the coil—especially around the V-shaped opening at the pipe edges.
On the basis of Faraday’s law of electromagnetic induction, the changing magnetic field generates eddy currents in the conductive material—especially steel pipe. There will be intense induced currents, mainly focused on the surface and edges of the pipe.
Heat Generation via the Skin Effect
High-frequency current exhibits the skin effect, which means the current tends to concentrated at the surface of a conductor.
Because of skin effect, the powerful eddy currents which generated at the edge of the steel pipe weld seam are concentrated in the extremely thin surface layer. The current flowing through the metal’s electrical resistance, there will be a great number of Joule heat (I²R heat).
Within just a few milliseconds, this heat raises the temperature of the pipe edges to a molten or plastic state, suitable for welding.
Completion of the Welding Process
At this point, the heated pipe edges are squeezed under the strong pressure of the extrusion rollers. The molten metal at both edges fuses and solidifies, which forms a solid, continuous weld seam.
Why Copper Tubing Is Essential (Structural and Material Considerations)
The reasons why the copper pipe is preferred material are as follows:
Excellent Electrical Conductivity
Copper is one of the best conductors of electricity—second only to silver. Its superior conductivity to the largest extent reduce resistive losses, ensuring that the great number of electrical energy is efficiently converted into magnetic field energy for welding.
Hollow Design for Water Cooling
This is the key design feature. Large currents flowing through the coil, it still generates enough heat although the copper has low resistance.
To keep the coil from overheating or burning out, cooling water persistently circulates through the hollow interior of the copper tube, which takes away heat in real time.
In this way, the coil is cooled while it operates, which ensures operate a safe and stable working temperature.
Summary of Copper Tube Component (Induction Coil) Function:
It is a water-cooled conductor which is designed to carry high-frequency current and convert it into a highly concentrated high-frequency magnetic field. At the weld seam of the steel pipe, this magnetic field induces eddy currents, which generates the heat required for welding.
Parameters
| Product Name | Copper Tube/Pipe |
| Length | 1m, 3m, 6m, or as required |
| Packing | Standard Export packaging by Pearl cotton, molded paper sheet, plastic trays, shrink wrap, or as customer's request. |
| Payment | T/T |
| Specification | Any Size Can be Customized |
| Package | Standard Sea Worthy Package |
Packing & delivery
Frequently Asked Questions
How does the copper tube generate the high-frequency magnetic field?
The copper tube is bent into a specific shape (like a U-shape or helical coil) and wrapped around the weld seam area. When a high-frequency current passes through the coil, it creates an intense and rapidly alternating magnetic field based on electromagnetic induction.
What is the role of eddy currents in the welding process?
The alternating magnetic field penetrates the steel pipe, particularly at the V-shaped opening of the edges. According to Faraday’s law of electromagnetic induction, this creates powerful induced eddy currents concentrated on the surface and edges of the pipe.
How does the skin effect help heat the steel pipe edges?
Because of the skin effect, high-frequency current concentrates only in the extremely thin surface layer of the metal. The electrical resistance to this highly concentrated current generates a massive amount of Joule heat ($I^2R$ heat), melting the edges within milliseconds.
Why is copper the preferred material for the induction coil?
Copper is chosen due to its excellent electrical conductivity, which is second only to silver. This high conductivity minimizes resistive power losses, ensuring that most of the electrical energy is efficiently converted into magnetic field energy.
Why is a hollow design used for the copper tube?
Despite copper's low resistance, the high currents used still generate significant heat. A hollow design allows cooling water to constantly circulate inside the tube, carrying away heat in real time to prevent the coil from overheating or burning out.
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