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Characteristics of butt welding flanges
2023-06-13
Butt welding flanges can be connected to the pipe to maintain the sealing performance of the pipe. The butt-welding flange is easy to replace the pipe section, easy to remove and check the pipe condition, and easy to seal the pipe section made of carbon steel. The flange is the connection of two large diameter pipes. The device is also called a carbon steel flange and usually consists of two flange parts and several fastening bolts.
The carbon steel flange is made of carbon steel. Low carbon steel has good plasticity and low strength. Adding the right amount of carbon will harden, and plasticity will reduce strength. Flanged connections may need to withstand higher tensile, compressive, torsional, and shear strengths. Therefore, welding flange is a better choice.
Welding flange use matters needing attention:
1. In order to prevent intergranular corrosion caused by heating the welded flange, the butt current should not be too large, about 20% smaller than the carbon steel electrode, the arc should not be too long, the intermediate layer should be cooled quickly, and the weld should be narrow. The electrode should be kept dry, the titanium calcium type should be dried at 150 ℃ for 1 hour, and the low hydrogen type should be dried at 200-250 ℃ for 1 hour (can not be dried repeatedly, otherwise the coating is easy to crack and peel off) to prevent the electrode coating from adhering to oil and other dirt, so as to avoid increasing the carbon content of stainless steel and butt welding flange in the weld, which will affect the weld quality.
2. In the butt welding process of butt welding flange, repeated heating will precipitate carbides, thereby reducing corrosion resistance and mechanical properties. After the chrome stainless steel welding flange is hardened, the American standard flange is large and easy to crack. The same type of chromium stainless steel electrode (G202,G207) for butt welding, should be more than 300 times and more than 700 times of preheating slow cooling.
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