High-frequency welding in two ways: contact welding and induction welding.
Contact welding is a pair of copper electrodes and welded steel pipe on both sides of the contact, the induced current penetration is good, high-frequency current of the two effects of direct contact with the copper electrode and the steel plate to maximize use, so the welding welding efficiency Higher and lower power consumption in the production of high-speed low-precision pipe is widely used in the production of particularly thick steel pipe generally also need to use contact welding. But the contact welding has two shortcomings: First, the copper electrode contact with the steel plate, wear quickly; the second is due to the flatness of the steel surface and the edge of the straightness of the impact of poor contact current welding stability, higher internal and external weld burr , In the welding of high-precision and thin-walled tube is generally not used.
Induction welding is based on one or more turns of the induction trap in the welded steel pipe, multi-turn effect is better than a single turn, but the multi-turn induction coil production and installation more difficult. Induction coil and the surface of steel pipe surface spacing is high efficiency, but likely to cause the induction coil and the discharge between the tube, the general induction tube to keep the surface of the pipe 5 ~ 8 mm gap is appropriate. Induction welding, the induction coil is not in contact with the steel plate, so there is no wear, the induced current is more stable to ensure the stability of the welding, welding the surface quality of steel, weld formation, such as API production Precision tube, basically in the form of induction welding.
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