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Heating temperature of butt welding flange
The heating temperature of the butt welding flange is that the austenitization temperature of the material is higher than this temperature. The principal compressive stress of the inner wall of the head can not be less than the temperature, the yield limit of the material, the maximum temperature of A335P22 and A335P91 are 850-900, 900-950 and 900-1000 respectively, the temperature measurement method is fixed far infrared thermometer and manual far infrared thermometer.
The butt welding flange is directly controlled by the flow regulation of the hydraulic system, the principle of determining the speed of the primary compressive stress of the inner wall butt welding flange is less than the yield limit temperature of the material, and the slender outer wall is less than the maximum elongation of the material at this temperature, The expansion coefficient, air permeability and intermediate frequency power of the butt welding flange material are large, the forward speed is fast, the forward speed and productivity are improved, but the thickness reduction rate of the butt welding flange is increased.
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