Production of erw steel pipe

ERW steel pipe must be prepared before welding, including beveling of weldments, surface cleaning of parts to be welded, and drying of flux. Bevel processing should ensure that there are no defects such as incomplete penetration at the root of the weld, and the amount of filler metal should be reduced as much as possible to meet the requirements, so as to save costs. Commonly used bevels are V-shaped, Y-shaped, X-shaped, double-Y and double-U-shaped. When the plate thickness is the same, the double-sided groove is smaller than the single-face groove, the U-shaped groove consumes less filler metal than the V-shaped groove, and the welding deformation is small, especially as the plate thickness increases, these advantages are more prominent, for larger steel pipe with thick wall can be opened with X or double U-shaped groove. The cleaning of the parts to be welded is mainly to remove surface rust, scale, oil and moisture, and prevent defects such as pores and slag inclusions. Generally, the inner surfaces of the groove and its both sides are cleaned by sand blasting, shot peening, and the like. The surface of the wire should be cleaned of scale and rust. The flux should be protected from moisture when it is stored. It must be dried and used at the specified temperature before use.

ERW steel pipe can be as a unique new energy-saving and environmentally-friendly steel pipe. The hot-expanded steel pipe has a hollow cross section and is used as a pipe for conveying fluid, such as pipes for transporting oil, natural gas, gas, water and some solid materials. Compared with solid steel such as round steel, the steel pipe is lighter in weight when it has the same bending and torsional strength. It is an economical section steel and is widely used in the manufacture of structural parts and mechanical parts, such as oil drill pipes, automobile transmission shafts, bicycles. Shelf and steel scaffolding used in construction. The use of steel pipes to manufacture ring-shaped parts can improve material utilization, simplify manufacturing processes, save materials and processing man-hours, such as rolling bearing rings, jacks, etc., and have been widely used in steel pipes. Steel pipes are also indispensable materials, and they must be made of steel pipes. Steel pipes can be divided into round pipes and shaped pipes according to the shape of the cross-sectional area. Due to the circular area* under conditions of equal circumference, more fluid can be 
delivered with a circular tube.

Various non-destructive testing methods in the production of straight seam steel pipes. At present, pipeline transportation methods are widely used in the fields of oil and gas, chemical industry, urban pipeline gas, etc. Any leakage or fracture failure during transportation will cause an incalculable loss of straight seam steel pipes. Therefore, in the manufacture of straight seam steel pipe for oil and gas transmission (hereinafter referred to as submerged arc welded pipe), a variety of inspection methods and methods are used to control its quality. The straight seam steel pipe has a relatively simple process, which is divided into high frequency welding, submerged arc welding and electric resistance welding, spiral welding, etc., the characteristics of continuous production, have a wide range of uses in civil construction, petrochemical, light industry and other departments. It is mostly used to transport low-pressure fluids or to make various engineering components and light industrial products.

The erw steel pipe has a certain anti-corrosion ability, and is generally used for waterproofing, rust prevention, acid and alkali resistance, oxidation prevention and the like. The process of straight seam anti-corrosion steel pipe base material includes submerged arc welded straight seam steel pipe and high frequency straight seam steel pipe. Anti-corrosion submerged arc welding straight seam steel pipe diameter is above 325, anti-corrosion high-frequency straight seam steel pipe diameter is below 426. The production process of thick-walled straight seam steel pipe belongs to the elastoplastic large deformation and contact nonlinear multiple nonlinear coupling problem, which makes the theoretical research and experimental research far behind the engineering theory. Even with the finite element method, there are many difficulties. The perfect numerical imitation study work. In engineering theory, the straight seam welded pipe forming process and the design of the forming unit still adopt the design method. The main drawback of the design method is that the rationality of the process and roll design must be tested by consumption theory, and the cost is high and the cycle is not suitable for the market economy. 

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