Large diameter welded elbow, Cathay Pacific pipeline, production of large diameter welded elbow provided by Hebei Cathay. Large diameter welded elbow, Cathay Pacific pipeline, production of large diameter welded elbow Hebei Cathay Pacific Pipeline Equipment Co. (www.hbgtgd.com) 2013 been newly introduced elbow to upgrade production methods can be divided into push system, repression , forging, casting and so on. To manufacturing standards can be divided into GB, electricity standard, standard ship, chemical, water standard, American standard, German standard, Japanese standard, Russia and other standard. By its radius of curvature of points: can be divided into long radius elbows and short radius elbows. It refers to a long radius elbow radius of curvature equal to 1.5 times the outer diameter of the pipe, i.e., R = 1.5D; refers to its short radius elbow radius of curvature equal to the pipe diameter, i.e. R = 1.0D. (D is the diameter of the bend, R is the radius of curvature). In terms of pressure levels to points: about seventeen species, and the American standard pipe is the same, there are: Sch5s, Sch10s, Sch10, Sch20, Sch30, Sch40s, STD, Sch40, Sch60, Sch80s, XS; Sch80, SCH100, Sch120, Sch140, Sch160, XXS; most commonly used two kinds of STD and XS. Purposes in accordance with different shapes can be divided into: grooved elbow, elbow card sets, double socket elbow, flange elbow, reducing elbow, elbow seat stay, and external teeth elbow, elbow punching, pushing system elbow, socket elbow, butt welding elbow, elbow, etc. within the wire. Before butt welding elbow, to avoid wholesale welding deformation of large diameter welded elbow, the whole group on both sides of the elbow into the outermost ends of the tiles after alignment, arc board and keel with stainless steel reinforcement is good. According to the conventional means of large diameter butt welding elbow, argon welding process requires large-diameter welded elbow, taking into account the cost of welding and shrimp waist diameter greater production of large diameter welded elbow, more difficult argon, the above factors When using welding inside and outside at the same time, two welders welding symmetry, both good solution to the problem of argon, but also very good shape. Spot welding process using argon welding joint. Electrode selection A022, wire selection: HOOCr21Nil0. Lower using arc welding primer. Before welding work in the left and right sides of the weld each 100mm range, rock chalk powder brush, adhere to the surface of the pipe to prevent splashing, before carrying out welding work, using a small current. Multi-layer multi-channel, continuous welding. After the completion of the overall welding, weld spatter on the elbow joints and surface grinding, welding completed prefabricated tile, nondestructive testing, internal and external weld surface pickling, passivation. The pickling completed elbow transported to the installation site, the final on-site installation work.