Spiral pipe welding technology

Because spiral pipe is with weld, so as to withstand the pressure of the liquid will be distributed on each side of the tube to enhance the strength of the tube. While generally large pipe if rolled steel plate welded directly straight, need a larger plate, greatly increasing the difficulty of making, it will use a large diameter spiral pipe spiral steel pipe (double-sided spiral submerged arc welded pipe) is a strip coil for raw materials, often warm extrusion molding, automatic double-sided submerged arc welding process wire spiral welded pipe joints. Another one is welded steel pipe, steel roll after it is welded to the vertical seam welds. Spiral welded pipe is welded steel spiral roll, seam spiral shape.
 
Welded steel pipe refers to a steel strip or plate bending round, square, etc. and then welded into the shape of the joint surface of the pipe. Welded steel pipe used is steel or steel billets. Since the 1930s, with the development of high-quality steel rolling production as well as the rapid development of welding and inspection technology, and constantly improve the quality of welds, welding steel pipe increasing varieties and specifications, and in more and more areas instead of non- pipe joints. Seamless steel pipe welded steel pipe is lower than cost, high production efficiency. Seamless steel pipe points, pipe. Points straight seam steel pipe, spiral steel pipe. Longitudinal points ERW (high frequency resistance welding), LSAW (LSAW). Spiral submerged arc welding process is (referred SSAW) and the difference is LSAW weld form, the difference is the difference with the ERW welding process, submerged arc welding (SAW) is to add media (wire, flux), ERW not needs, ERW is melted by frequency heating. Pipe according to production methods can be divided into two categories: seamless and welded steel pipe. Seamless steel pipe according to production methods can be divided into: hot-rolled seamless pipe, cold drawn tubes, precision steel tubes, thermal expansion, cold spinning tube and squeeze tubes. Seamless steel pipe with high-quality carbon steel or alloy steel, hot-rolled, cold-rolled (pull) of the points. Longitudinal production process is simple, high efficiency, low cost, rapid development. Spiral Welded Longitudinal generally higher than high, can narrow the billet production of large diameter pipe, you can also use the same width of the billet production of different pipe diameters. However, compared with the same length of straight pipe seam weld length of 30 to 100%, and lower production rate. Therefore, most of the smaller diameter pipe straight seam welded, large diameter spiral welded pipe for the most.
 
Currently spiral steel pipe products has a new product plastic composite pipe for hot-dip galvanized steel substrate, the powder coating technology in molten inner wall (wall when needed also) made of plastic coating steel pipe excellent performance. Compared with galvanized pipe, with anti-corrosion, no rust, no fouling, smooth smooth, clean, non-toxic, long life and other advantages. It is more than three times the life test, plastic composite pipe is galvanized pipe. Compared with the plastic pipe, with high mechanical strength, pressure, heat resistance and good.