Stainless steel flat welded flange side accessories are customized. The fixture must first reach the leak point. The main point is to create a closed cavity between the stainless steel flange of the valve body and the pipe joint. To prevent leakage between the valve body and the stainless steel flange due to pressure retention, a ring cavity is provided where the outer edge of the clamp and the stainless steel flange of the valve body overlap. The tooth contact clamp is used as a limiting device because the clamp on the small diameter stainless steel flange is easily moved to the small diameter stainless steel flange during the injection process. After the sealant has hardened during operation, check for stress relaxation and then perform a local re-injection to close the injection port.
Stainless steel flat welding flange installation procedure
1, welding current should not be too large, about 20% smaller than carbon steel electrode, arc can not be too long, interlayer cooling can not prevent heating flange cover corrosion corrosion must be fast.
2, the electrode must be dried before use. Perovskite type should be dried at 150°C for 1 hour, low hydrogen type should be dried at 200-250°C for 1 hour (do not repeat drying more than once. Do not increase the welding, the carbon content of the welding is to prevent the electrode coating from adhering to the oil and other dirt, so as not to affect the quality of the parts.
3. When welding stainless steel flange fittings, carbide precipitation and mechanical properties will occur due to repeated heating and corrosion resistance.
4. After welding, the flange of the hardenable American standard chromium stainless steel flange fittings is larger and easier to crack. Similar types of chrome-stainless steel electrodes (G202, when using G207) must be preheated to 300°C or higher after welding and gradually cooled to about 700°C after welding. If heat treatment of the weld is not possible, the rod (A107, A207) must be used for welding of stainless steel flanges.
5, stainless steel flange, appropriate amount of stable elements Ti, Nb, Mo, etc., to improve corrosion resistance and weldability, weldability is better than chromium stainless steel flange, when using the same type of chromium stainless steel flange electrode (G302, G307), preheat it to 200°C or higher, and tempered to about 800°C after welding. If not, it needs to be used.
6, stainless steel flange electrode (A107, A207), stainless steel flange fittings, welding flange electrode with excellent corrosion resistance and oxidation resistance is widely used in the manufacture of chemicals, fertilizers, petroleum, medical machinery.
