The front end of the unit is equipped with a storage sleeve, high-frequency welding process of longitudinal steel pipe is completed in the high-frequency welded pipe unit high-frequency welded pipe unit is usually composed of roll forming, high-frequency welding, extrusion, cooling, sizing, flying saw cutting and other components. The rear end of the unit is equipped with a steel pipe turning rack; electrical local mainly composed of high-frequency generator, DC excitation generator and instrumentation automatic control device.
1. the production process of straight seam high frequency welded steel pipe
Longitudinal steel pipe is made by high-frequency welding machine will be certain specifications of the long strip rolled into a round tube and will be straight seam welded into steel pipe. The shape of the steel pipe can be round or square or shaped depending on the sizing rolled after welding. The material of welded steel pipe is mainly low carbon steel and σ s ≤ 300N/mm2 σ s ≤ 500N/mm2 low alloy steel or other steel. The production process of high frequency welding of straight seam steel pipe is as follows: the steel at the edge of the weld is partially heated to a molten state.
2. high-frequency welding China Steel Pipe Information Port China Steel Pipe Information Port High-frequency welding is based on the principle of electromagnetic induction and the skin effect, proximity effect and eddy current thermal effect of AC charge in the conductor. By the roller extrusion, so that the butt weld to achieve the crystalline bonding, so as to achieve the purpose of weld welding high-frequency welding is an induction welding (or pressure contact welding) without weld filler, no welding spatter, welding heat-affected zone is narrow, beautiful welding shape, welding mechanical properties, and other advantages, so in the production of steel pipe by the application. High-frequency welding of steel pipe is the use of alternating current skin effect and proximity effect, steel (strip) by roll forming, the formation of a cross-sectional break in the circular billet, the billet near the induction coil rotation of an impedance or a set of impedance (magnetic rod) impedance and billet opening to form an electromagnetic induction circuit, skin effect and proximity effect, the edge of the billet opening to produce a strong and concentrated thermal effect, so that the edge of the weld is rapidly heated to the weld. The edge of the weld is rapidly heated to the required temperature for welding and after extrusion by the pressure rollers, the molten metal is crystalline bonded and a solid butt weld is formed after cooling.