What Are The Technical Considerations When Welding Stainless Steel Pipe Butt Elbows
Before welding the stainless steel pipe fittings butt-welded elbow, in order to avoid welding deformation, the two ends of the outermost tiles on both sides of the elbow that are assembled into a whole are aligned, and then reinforced with stainless steel arc plates and keels. According to conventional welding techniques, argon filling welding is required. Considering the welding cost and the large diameter of the shrimp waist pipe, it is difficult to fill argon. In summary, two welders inside and outside are selected to weld symmetrically during welding, which not only solves the argon filling problem well, but also has good forming.
The welding process of argon spot welding is selected. The welding rod is A022, and the welding wire is: HOOCr21Nil0. The lower layer uses argon arc welding for primer. Before the electric welding operation, brush chalk powder within 100mm on both sides of the weld to prevent splashes from adhering to the surface of the pipe. Before the electric welding operation, use a small current. Multi-layer and multi-pass, continuous welding. After the overall welding is completed, the welding points and splashes on the surface of the butt-welded elbow are polished, and the tiles that have been prefabricated and welded are finished.
Carry out nondestructive testing, pickle and passivate the inner and outer weld surfaces. Transport the pickled elbows to the installation site for on-site installation. Butt-welded elbows are elbows formed by hot pressing or forging technology. The connection method is to weld the elbows and steel pipes together, and use resistance heat to weld the two workpieces together along the entire end face. There are usually two methods: resistance butt welding and flash butt welding. The productivity is very high and it is easy to automate, so it has been widely used.
Stainless Steel Weld Elbow not only saves space and reduces weight, but more importantly, it ensures that there will be no leakage at the joint and has good sealing performance. The compact flange size is reduced because the diameter of the seal is reduced, which will reduce the cross-section of the sealing surface. Secondly, the flange gasket has been replaced by a sealing ring to ensure that the sealing surface matches the sealing surface. The B value of the 45-degree elbow is a structural dimension, which is mainly convenient for pipeline planners.