Spiral steel pipe and production process, human has invented many excellent welding and production methods, and greatly promote the steady and rapid development of the industry, also makes this industry in the development of optimized. Automatic submerged arc welding is a new welding method, invented in 1940, it is the same place and the front of the manual welding is it or slag protected, but this residue is not electrode coating, welding medicine specifically smelting. Into wire, with the means and the wire reel to send the welding wire, is continuously sent to the wire, this welding method is to continuously feed the wire, arc ignited meltable particulate solder coverage on the wire, and the base material, and part of the melting and evaporation of the flux constitutes a cavity arc inside the cavity stable combustion, so call it automatic submerged arc welding. The arc is buried inside the cavity. Welding medicine system is loaded by a funnel welding drug through a pipe fed to the front of the to be welded. Second difference is not used electrodes, the use of wire, because the wire can be continuously sent; electrode, burn an electrode must have a welding rod head give throw, and the operation is stopped, other welding rod and then welded.
Such welding method compared with other methods, there is a great advantage of this welding submerged arc spiral pipe this method, a first advantage is fully realized automated; second advantage, it is in the buried arc under welding, so its heat exchange and protection performance is relatively strong, relatively high welding quality; third advantage, since the automatic submerged arc welding arc is buried in the bottom of the welding drug, so it can be used a large current, the welding efficiency relatively high.
In addition, the spiral steel hot-rolled strip steel spiral bending, automatic submerged arc welding (also known as spiral steel pipe, spiral pipe) within the seam and the outer seam welded spiral steel pipe. Due to the following reasons, it can be widely applied to the production of large diameter spiral pipe:
1) changing the forming angle, you can use the same width of the strip spiral steel pipe production of various calibres;
2) because it is a continuous bending, spiral steel pipe cut lengths unrestricted;
3) weld spiral evenly distributed on the entire spiral pipe circumference, the dimensional accuracy of the spiral pipe is high, strength is also high;
4) easy to change the size, suitable for small quantities of the spiral steel production of many varieties