Induction Welding

on welding of high-frequency currents. The method used in the manufacture of welded pipes.

Induction (high frequency) welding.

The metal is heated by passing through a high-frequency currents and compressed. High-frequency currents are most convenient for the introduction of the metal inductive non-contact method, in addition, they are convenient for the concentration in the heating zone with the skin effect and proximity effect and a large inductive reactance shunt tract. Therefore, almost always in high-frequency currents on the tube or engine generators. The most widely used until the pipe is a quark.

1 - Pipe 2 - ferrite core, 3 - Contact 4 - crimping rollers

1 - Pipe 2 - inducer 3 - Core 4 - crimping rollers

The first figure shows schematically the device pipe welding mill to supply welding current contacts. Harvesting of the pipe 1 moves progressively leading wheels, crimped crimp rollers 4. Gap workpiece prior to welding is adjusted so that the edges are at an acute angle and converge at the point of welding. The current from the high-frequency generator is fed to the workpiece through the fixed contact 3. The current density reaches a maximum value at the point of contact converging edges, there develops the highest temperature, and welding occurs under the action of crimping rollers. For reducing the shunting of welding, current is introduced into the workpiece ferrite core 2, so that the inductive impedance shunt paths for high frequency currents becomes very large and the leakage current between the contacts in addition to the welding is dramatically reduced.

The second figure shows a diagram of the device to supply the welding current to the workpiece by the induction method. Current high-frequency generator is supplied to the inductor, which induces currents in the workpiece tube. Experience has shown that in most cases, more rational way to feed an induction current to the workpiece, it simplifies the construction and operation of pipe welding mill, there is no consumption of expensive wear contacts the workpiece surface condition does not affect weld quality. Mills of this type have been successfully used for the manufacture of pipes 12-60 mm at speeds up to 50 m / min. Power produced from the shock tube generator power of 160 kW at a frequency of 440 kHz and 880. Produced and pipes of large diameters, 325 and 426 mm, wall thickness 7-8 mm, with a welding speed of 30-40 m / min. Can welding of steel and non-magnetic materials such as brass.

See also:
Blacksmith (Forge) Welding
Blacksmith (Forge) Welding Part 2
Induction (high frequency) Welding
Diffusion Welding
Casting or Foundry Welding
Friction Welding
Electrolytic Welding
Welding Under Water
Explosive Welding