12. chamfer: The steel pipe inspection conducted after the end of the process seamless steel pickling process to reach the pipe end beveling size requirements; 13. Ultrasonic Inspection Ⅱ: root again by ultrasonic testing to check in straight seam welded steel pipe expanding defects that may arise after the water pressure; 14.X-ray inspection Ⅱ: expanding steel pipe after hydrostatic test and industrial X-ray inspection and pipe end welds TV film; 15. The tube end magnetic particle inspection: to make this Checker to detect defects in the tube ends; 16. corrosion and coating: after passing the steel according to user requirements for corrosion and coatings. LSAW straight seam double submerged arc welded steel pipe technology in a new welding method invention in 1940, it is the same as the previous manual welding or the use of the place is its slag protection, but this is not the welding slag medicine skin. Straight seam double submerged arc welding and manual welding the same place or the use of slag to protect it, but the residue is not seamless steel electrode coating is specially melting out of flux. The flux flux system consists of a funnel fitted through a pipeline to be welded to the front. The second difference is the use of electrodes, using wire seamless steel pickling factory, because the wire can be continuously sent; electrode, we gotta burn a welding electrode head gave a throw, and the operation was to stop, change then welding rod. In this way, the first advantage is completely automated; second advantage, which is carried out under the submerged arc welding, so it's the heat exchange and protection of relatively strong performance, high quality welding out; third advantage Since submerged arc welding arc welding flux buried underneath, so it can use a large current, later changed to more efficient welding wire, with the delivery device and wire spool wire, the wire is continuously sent to the acid phosphate seamless pipe, this welding process is continuous feeding of wire, in particulate meltable solder coverage ignition arc welding wire, constituting part of the melting and evaporation of a base material and solder cavity, the cavity inside the arc is stable combustion, so call it submerged arc welding. Arc is buried inside the cavity. Pipeline is a high-strength steel, this pipeline first prefabricated in a factory inside a while, and then get on the site, in the field of welding, the welding process in the factory production of this pipeline is to use submerged arc welding, submerged arc now has become, there are double wire submerged arc welding, as well as multi-wire submerged arc welding, to further improve efficiency. Acid phosphate seamless steel pipe | seamless steel Tai'an | pipe industry by virtue virtue Liaocheng Industry Co., Ltd. Liaocheng virtue Pipe Co., Ltd. (www.meidegc.com) (www.meidegc.com) (www.mdwfg.com) (www.mdggc.com) strong, credible, Liaocheng in Shandong steel industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead virtue of Industry and you work into the brilliant, for a better future!