Production technology of ERW steel pipe

ERW steel pipe production process. High frequency straight seam welded steel pipe has a relatively simple process. The characteristics of continuous production quickly, in civil construction, petrochemicals, light industry and other departments have broad USES. Used for low pressure liquid or make it more all kinds of engineering components and light industrial products. 1, the high frequency straight seam welded steel pipe production process: straight seam welded steel pipe by high frequency welding machine to certain specifications of strip steel coil into circular tube and straight seam welded steel pipe. The shape of the steel tube can be round, also can be square or aliens, it depends on the sizing rolling after welding. Material of welded steel pipe are mainly: low carbon steel and sigma acuities were 300 n/s was, sigma acuities were 500 n/s was of low alloy steel and other steel products. Straight seam steel pipe production technology of high frequency welding process is as follows: 2, high frequency welding, high frequency welding is according to the principle of electromagnetic induction and ac electric charge in the conductor skin effect and proximity effect and eddy current heating effect, make the edge of the weld steel locally heated to a molten state. The squeezing roller, to realize the joint between the crystal butt weld, so as to achieve the purpose of the welding seam, high frequency welding is a kind of induction (or contact pressure welding) welding. It doesn't need weld filler, no welding spatter, narrow welding heat affected zone, weld moulding beauty, weld the advantages of good mechanical performance, so is widely used in steel production. Steel tube of high frequency welding is using alternating current (ac) of skin effect and proximity effect, steel (strip) after rolling forming, form a cross section of broken circular tube billet. Within the tube billet near the center of induction coil rotating one or a set of impedance (magnet). Impedance and pipe opening form a electromagnetic induction loop. Under the action of skin effect and proximity effect, the welded steel pipe opening edges produce powerful and concentrated heating effect. Make weld edge rapidly heated to required after roller extrusion temperature, welding metal molten state to realize the joint between the crystal, after cooling to form a firm butt weld.