The accessories on one side of the stainless steel flat welding flange are customized, and the fixture needs to reach the leakage point first. The key is to establish a closed chamber between the stainless steel flange of the valve body and the pipeline connection joint. In order to prevent leakage between the valve body and the stainless steel flange due to pressure retention, a circular cavity is set up at the overlap of the outer edge of the clamp and the stainless steel flange of the valve body. The tooth contact clamp is used as a limiting device because during the injection process, the fixture on the small diameter stainless steel flange is easily moved to the small diameter stainless steel flange. After the sealant hardens during operation, check the stress relaxation effect, and then perform local re injection to close the injection port

Installation steps for stainless steel flat welding flange

1. The welding current should not be too high, about 20% smaller than that of carbon steel welding rods. The arc should not be too long, and interlayer cooling cannot prevent corrosion and corrosion of the heating flange cover. It is necessary to determine quickly.

2. The electrodes need to be dried before use. Calcium titanium 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 dry more than once. Do not increase the welding carbon content to prevent the electrode coating from adhering to oil and other dirt, so as not to affect the quality of the components.

3. When welding stainless steel flange fittings, carbides will precipitate 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 more prone to cracking. Similar types of chromium are not rusted.) When welding steel electrodes (G202, when using G207), preheating at 300 ° C or higher is required after welding, and gradually cooling to about 700 ° C after welding. If heat treatment of the weld seam is not possible, the rods (A107, A207) required for welding stainless steel flange pipes

5. Stainless steel flanges, with an appropriate amount of stable elements such as Ti, Nb, Mo, etc., are used to improve the actual report based and weldability. The weldability is better than that of chromium stainless steel flanges. When using the same type of chromium stainless steel flange electrodes (G302, G307), preheat them to 200 ° C or higher, and temper them to about 800 ° C after welding. If not, it needs to be used

6. Stainless steel flange pipe welding rods (A107, A207), stainless steel flange pipe accessories, have excellent performance in welding flange electricity. They are widely used in the manufacturing of chemicals, fertilizers, petroleum, and diagnostic machinery, with practical reporting as the main and oxidizing properties