The Correct Understanding of Straight Seam Steel Pipe
Update:
2016-11-28 View(s):
2492 Keywords :welded pipe.SSAW steel pipe
Straight seam welded steel pipe is made 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 square or round can be profiled depends on the sizing rolling after welding. Mild steel welded steel pipe material is mainly and sigma acuities were 300 n/s was sigma acuities were 500 n/s was low alloy steel pipe and other steel products.
High production efficiency, low interest rates, the characteristics of continuous production, fast straight seam steel pipe has a relatively simple process. Civil construction, petrochemicals, light industry and other departments have broad USES. Used for low pressure liquid or made many engineering components and light industrial products. Straight seam welded steel pipe is made 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 square or round can be profiled depends on the sizing rolling after welding. Mild steel welded steel pipe material is mainly and sigma acuities were 300 n/s was sigma acuities were 500 n/s was low alloy steel and other steel products.
Squeeze roll extrusion, extrusion pressure control of two edges of billet heating after the soldering temperature. To form a common metal grain interpenetrate, crystallization, eventually forming solid weld. If the extrusion pressure is too small, the amount of common crystal small, weld metal strength drops, stress produces after cracking; If the extrusion pressure is too large, will make molten metal being squeezed out of the seam, not only reduce the weld strength, and can produce a large number of inside and outside burr, even cause the welding seam defects such as.
Effective heating time is longer, high-frequency induction coil, induction coil position control high frequency should be close to squeeze roll position as far as possible. If the induction coil located away from the squeezing roller. Heat affected area broad, weld strength; On the other hand, the lack of weld edge heating, bad after extrusion molding.
Impedance of cross-sectional area usually should not be less than 70% steel pipe diameter of sectional area, induction coil, its role is to make the pipe weld edge and magnet form a electromagnetic induction circuit, impedance device is a magnet for or a compound tube. Proximity effect occurs, eddy heat concentrated near the pipe weld edge, the tube billet is heated to the welding temperature. Impedance for a drag within the tube billet, steel wire
Due to the tube billet rapid movement, the center should be relatively fixed position in the center of the close to squeeze roll. When switched on. Impedance device by pipe wall friction loss is bigger, often need to change.
To clear. Clear method is fixed rack cutter, weld after welding and extrusion welding scar. By rapid movement of ERW pipe, the welding scar leveling. Welded pipe inside burr is generally not cleared.
