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Quality Assurance AC Copper Pancake Tubing from China Suppliers – Factory Direct Supply for Welding Applications
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 the copper tube is hollow.
High-current flows 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 which are 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)
The reasons why the copper pipe is the 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 reduces 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 still generate 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 a safe and stable working temperature.
Summary of Function: The function of the copper tube component (induction coil) in a high-frequency pipe making machine is to act as 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 (FAQ)
How is the high-frequency magnetic field generated?
The high-frequency magnetic field is generated by bending a hollow copper tube into a specific shape (usually a U-shape or helical coil) and wrapping it around the weld seam. When high-current flows through the coil from the welder's power supply, it produces an intense alternating magnetic field via electromagnetic induction.
What role do eddy currents play in the welding process?
The changing high-frequency magnetic field induces intense eddy currents in the conductive steel pipe, focusing primarily on its surface and edges (especially around the V-shaped opening), which prepares the edges for heating.
Why is the skin effect important for heating the pipe?
The skin effect causes high-frequency current to concentrate in an extremely thin surface layer at the weld seam. This concentration generates massive Joule heat (I²R heat) within milliseconds, rapidly raising the temperature of the pipe edges to a molten state for welding.
Why is copper the preferred material for the induction coil?
Copper is chosen due to its excellent electrical conductivity (second only to silver). This superior conductivity minimizes resistive energy losses, ensuring that electrical energy is efficiently converted into magnetic field energy.
Why does the copper tube have a hollow design?
The hollow design allows cooling water to persistently circulate through the interior of the copper tube. This removes heat in real time to prevent the coil from overheating or burning out under high-current operations.
Can the specifications of the copper tube be customized?
Yes, specifications can be customized to any size as required. Standard lengths include 1m, 3m, and 6m, with customized packaging options available upon request.
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