elbow in the piping system, the elbow is to change the direction of pipe pieces. In addition, according to project needs, including 60 ° and other non-normal angle of elbow angle points, 45 ° and 90 °, 180 ° three kinds of the most commonly used. Elbow material is stainless steel, alloy steel, malleable iron, carbon steel. Connected with the tube: soldered directly to the flange connection (most commonly used), hot melt connection, fused connection, threaded connections and socket type connection. Accordance with the production process can be divided into: welding elbow, punching elbow, elbow push system, casting elbow. Other Name: 90 degree elbow bent at right angles, love, curved. Seamless thick-walled elbow for a pipe bend pipe fittings. Fittings in piping systems for multi-use, the largest proportion of about 80%. Typically, the elbow of the type of the material thickness of the article to select the type of molding process. Currently. Commonly used in factory seamless elbow push hot stamping, extrusion forming process. Seamless elbow pipe because of the different manufacturing process is divided into hot-rolled (extrusion) seamless elbow pipe and cold drawn (rolled) seamless elbow pipe two. Cold drawn (rolled) pipe is divided into circular tube and shaped pipe. The raw material is rolled seamless elbow pipe fittings tube round tube embryos to After cutting machine cutting the growth of approximately one meter blank, and by conveyor belt to the furnace heating. The billet is fed to the furnace heating temperature of about 1200 degrees Celsius. The fuel is hydrogen or acetylene. The furnace temperature control is the key issue. Round tube came after pressure punch through air. Generally more common punch cone piercing mill, high this puncher production efficiency, product quality, large perforated expanding, can be worn a variety of pipe fittings. Perforation, round tube has been three-roll cross rolling, rolling or extrusion. After extrusion detached sizing. Sizing mill rotating at high speed through the cone drill into Billet drilling, formation of pipe fittings. Forging method: use forging machine tube ends or part of the red stretch outer diameter reduction, commonly used type of rotary forging machine, link wheel. Rolling method: generally do not have a mandrel, suitable for thick-walled tube inside circular edge. Placed in the tube core, the peripheral rollers push for round edge processing. Stamping method: the punch with a tapered core will expand the pipe ends to the required size and shape. The bending method: There are three methods is more commonly called stretching method, a method, another method called stamping method, a third roller method, 3-4 roller, two fixed rollers, and an adjustment roller, to adjust the fixing roller from the the finished fittings is curved. The bulging method: one is placed in the inner tube rubber, the top of the compression with a punch, so that the tube projecting molding; Another method is the hydraulic bulge forming in the middle of the tube filled with liquid, the liquid pressure drum tube into the desired shape, most of the production of the corrugated tube used in this way. Seamless elbow will not cause corrosion, pitting, corrosion or wear and tear. One of the highest metal material strength stainless steel or construction material. Because the stainless steel has good corrosion resistance, so it can make the structural member to permanently maintain the integrity of the design of the works. Rolling seamless elbow pipe material is a round tube, round tube embryos to blank After cutting machine cutting the growth of approximately one meter, and by conveyor belt to the furnace heating the billet is fed into the furnace heating, temperature of about 1200 degrees Celsius. furnace temperature control is the key issue. wear air pressure puncher round tube came out to go through. fuel is hydrogen or acetylene. generally more common punch is tapered roller puncher, kinds of punching machine production efficiency, product quality, large perforated expanding, can be worn a variety of pipe fittings.