A Butt-welding flange is a kind of pipe fittings with a neck and a round pipe transition and butt-welding connection with the pipe. The advantages of butt-welding flanges are anti-corrosion, acid and alkali resistance, long service life, etc., but also in the price calculation reasonable, smooth surface, acid, and alkali resistance, high-temperature resistance, not easy to deformation, sealing good characteristics. The scope of application is used for pressure or temperature fluctuations in the pipeline or high-temperature, high-pressure, and low-temperature pipeline above, or the transportation of expensive, flammable, explosive media on the pipeline.
Butt welding flange temperature distribution is an important process parameter. The relative position of the induction coil and mandrel is a secondary factor, and the temperature distribution along the radial direction of the mandrel is low, medium, and high. Higher heating temperatures increase the thickness of the butt weld flange. They depend directly on the shape of the induction coil and the relative position of the induction coil to the mandrel. The shape of the induction coil is the main factor. The pushing speed's-influence on the pusher head's geometry is an important process parameter. The flow regulation of the hydraulic system directly controls them. The principle of determining the rate of primary compressive stress in the inner butt-welding flange is less than the yield limit temperature of the material and the elongated outer wall is less than the maximum elongation of the material at that temperature. The coefficient of expansion of the butt-welding flange material, permeability, and medium-frequency power is large, the forward speed is fast. Forward speed and productivity increase, but the thickness of the butt-welding flange reduction rate increases.
The principle of determining the heating temperature of butt-welding flanges is that the austenitization temperature of the material is higher than this temperature. The higher the austenitization temperature of the butt-welding flange, the higher the heating temperature; the higher the high-temperature yield limit, the higher the heating temperature, the higher the main compressive stress in the inner wall of the welded bending head is less than the yield limit of the material at that temperature. the maximum temperatures of WB36, A335P22 and A335P91 are 850-900, 900-950, and 900-1000, respectively. the method of measuring the temperature combines a fixed far infrared thermometer and manual far infrared temperature.
The principle of determining the heating temperature of butt weld flanges is that the austenitization temperature of the material is higher than the heating temperature; the higher the high-temperature yield limit, the higher the main compressive stress in the inner wall of the butt weld elbow is less than the yield limit of the material at that temperature. The higher the austenitization temperature, the higher the heating temperature of the butt weld elbow.
It is mainly used for flange and pipe butt welding, its structure is reasonable, has strength and stiffness, withstand high temperature and high pressure and repeated bending and temperature fluctuations, and reliable sealing. Butt-welding flanges with a nominal pressure of 0.25~2.5MPa adopt a concave-convex sealing surface. Butt-welding flanges are widely used and popularized in pipe fittings, which need to be used according to the corresponding ways and methods. They are flanges with necks and round pipe transitions and butt-welded connections with pipes.
Processing method: high-precision CNC lathe turning, ordinary lathe fine turning, argon arc welding, and other processing
Nominal pressure: sch5s, sch10s, sch20s, sch30s, sch40s, etc.
Manufacturing standard: national standard, American standard, Russian standard, Japanese standard, etc.
Connection: flange nut, bolt connection.
