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Quality Assurance AC Copper Pancake Tubing from China Suppliers | Factory Direct Copper Coil 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 an 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 be concentrated at the surface of a conductor.
Because of the skin effect, the powerful eddy currents 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 generates a great amount 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)
Excellent Electrical Conductivity
Copper is one of the best conductors of electricity—second only to silver. Its superior conductivity reduces resistive losses to the largest extent, ensuring that a great amount of electrical energy is efficiently converted into magnetic field energy for welding.
Hollow Design for Water Cooling
This is the key design feature. When large currents flow 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, ensuring a safe and stable working temperature.
Summary of Function: The copper tube component (induction coil) in a high-frequency pipe making machine is a water-cooled conductor 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 generate 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
Why is copper preferred for the induction coil in high-frequency welding?
Copper features exceptional electrical conductivity, second only to silver. This minimizes resistive losses and ensures that the maximum amount of electrical energy is converted into the magnetic field required for welding.
What is the purpose of the hollow design in the copper tube?
The hollow design allows cooling water to continuously circulate inside the copper tube. This dissipates the heat generated by the high-current flow, preventing the coil from overheating or burning out during operation.
How does the skin effect assist in welding the steel pipe?
High-frequency current tends to concentrate at the surface of a conductor. In welding, the skin effect concentrates the induced eddy currents on the extremely thin edges of the steel pipe, rapidly generating Joule heat to melt the edges for fusing.
What role do eddy currents play in the welding process?
The alternating magnetic field from the copper coil induces powerful eddy currents in the steel pipe. Due to the pipe's electrical resistance, these currents produce intense Joule heat (I²R heat) that heats the pipe edges to a weldable state within milliseconds.
Can the copper tubing size and specifications be customized?
Yes, the copper tubes can be customized to any size and length requirements to match the specifications of different high-frequency pipe making machines.
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