Spiral steel pipe production technology (1) raw materials that is, strip coil, welding wire, flux. They are subjected to strict physical and chemical tests before they are put into use. (2) The butt joint of strip steel head and tail adopts single-wire or double-wire submerged arc welding, and

What is the definition of submerged arc welded straight seam steel pipe?The submerged arc straight seam steel pipe body has a longitudinal weld, and when the diameter is greater than 914mm, two welds are allowed. The wire submerged arc filler welding is used. The submerged arc longitudinal seam stee