Before welding of 304 stainless steel butt welding elbow, in order to avoid welding deformation, the two ends of the outermost tiles on both sides of the elbow are aligned, and then reinforced with stainless steel arc plate and keel. The welding method requires argon-filling welding. Considering the welding cost and the large diameter of the shrimp’s waist, it is difficult to fill with argon. Taking into account the above factors, two welders inside and outside are used for symmetrical welding at the same time, which is a good solution to argon filling. The problem, and it’s also well-shaped.
The welding process of argon spot welding is adopted. The welding rod is A022, and the welding wire is HOOCr21Nil0. The bottom layer is made by argon arc welding. Before the electric welding operation, brush stone chalk powder within 100mm on the left and right 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 multi-channel, continuous welding. After the overall welding is completed, the solder joints and splashes on the surface of the butt welding elbow are ground, the prefabricated welded tiles are subjected to non-destructive testing, and the surfaces of the inner and outer welds are pickled and passivated. The elbow is transported to the installation site for on-site installation work.
Butt welding elbow is a kind of elbow formed by hot pressing of steel or formed by forging technology. The connection method is through butt welding of elbow and steel pipe, and the two workpieces are welded together along the entire end face by resistance heat, usually, with resistance Two methods, butt welding and flash butt welding, have been widely used because of their high productivity and easy automation.
304 stainless steel butt welding elbow not only saves space and weight but more importantly, ensures that the joints will not leak and have good sealing performance. The reduction in size of the compact flange is due to the reduced diameter of the seal, which reduces the cross-section of the sealing face. Second, the flange gasket has been replaced by a sealing ring to ensure the matching of the sealing face to the sealing face. The B value of the 45-degree elbow is the structural size, which is mainly for the convenience of pipeline designers.
Characteristics of butt welding elbow in construction
Feature 1: Butt welding elbows are mainly used to connect two sections of pipes with different end face radii, or to change the diameter of pipes. This type of elbow generally needs to be produced according to specific engineering requirements or specific drawings. In addition to meeting the requirements of the pipe diameter, the specific conditions of the pipeline must also be considered, such as pipeline transportation pressure, fluid viscosity, abrasion, corrosiveness, and fluid transportation. temperature and other factors. It has certain pertinence and usability, which is another important construction and use a feature of butt welding elbow.
Feature 2: Butt welding elbows have weld seams. After the welding construction operation is completed, butt welding elbows need to be treated with anti-rust or anti-corrosion treatment according to the actual situation or the external environment of the pipeline to avoid rust or corrosion of the elbow at the weld seam. –This process can ask us to clarify the quality of the butt welding elbow before use.
Feature 3: Butt welding elbows are usually welded at the pipeline construction site. This is because the welding standards of various types of pipelines are different, and on-site welding needs to be carried out according to the pipeline weld level. Field welding is required for different pipe weld grades, which is another feature of butt-welded elbows.
304 stainless steel butt welding elbow is a long strip of steel with a hollow section and no joints around it. The steel pipe has a hollow section and is widely used as a pipeline for transporting fluids, such as pipelines for transporting oil, natural gas, gas, water and certain solid materials. Compared with solid steel such as round steel, the steel pipe is lighter in weight when the bending and torsional strength is the same. Drive shafts, bicycle racks and steel scaffolding used in building construction, etc.
Due to the area of the circle under the condition of the equal perimeter, more fluids can be conveyed in butt-welded elbows with circular pipes. In addition, when the ring section is subjected to internal or external radial pressure, the force is relatively uniform. Therefore, most steel pipes are round pipes. The output flow of the seamless butt welding elbow is large and suitable for all walks of life, and it is more convenient to connect with other steel pipes.
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