Mechanical properties of thick wall 20G elbow

 The main points of mechanical properties of thick wall 20G elbow are wide range: large elbow, large caliber Elbow series, stainless steel elbow series, carbon steel elbow series, alloy steel elbow series, national standard elbow, non standard elbow, American standard elbow, German standard elbow, Russian standard elbow, standard elbow, electric power elbow, electric bends, electric bends, electric bends, electric bends, electric bends, electric bends, electric bends, electric power bends, electric bends, electric power bends, electric power bends, electric power elbows for power plants. Marine Elbow series, 20G high pressure elbow can be divided into 45 degree large caliber elbow in accordance with the angle, with 90 degree thick wall elbow and 180 degree elbow and other different angles. According to the material, it can be divided into carbon steel large caliber elbow, stainless steel large caliber elbow, alloy steel large caliber elbow. According to the radius of curvature, it can be divided into long radius elbow and short radius elbow. The main standards of large caliber elbow are national standard, electric standard, Sinopec standard, marine standard, Japanese standard, American Standard and so on. The large caliber elbow has the advantages of smooth inner wall, small heat medium flow resistance, acid and alkali resistance, long service life and convenient installation. Take P91 steel thick wall elbow as an example, preheating and interlayer temperature tracking before welding. According to the analysis of the welding performance of P91, it is necessary to strictly control the preheating temperature before welding and the interlayer temperature of the weld layer. The preheating temperature of TIG welding is selected 100~150 C, and SMAW is heated to 250~300. During the whole welding process, the temperature of the weld seam is monitored by the far infrared thermometer. Argon filling is used to protect the welding. Because of the high content of alloy, P91 steel has poor fluidity and burnt roots. It can protect the metal molten pool not to be oxidized and improve the mechanical properties of the weld. Before welding, a set of simple argon charging device is made according to the actual field, and the gas chamber is formed inside the pipe, which can ensure the quality of the welding joint of the thick wall elbow.