Precautions for stainless steel Weld neck flanges

　　1. In order to prevent the contact between the Weld neck flanges and cover, the welding current should not be too large, it is less than 20% less than the carbon steel electrode, the arc should not be too long, the interlayer is fast cold, and the narrow welding path is suitable.

　　2, the welding rod should be dry in use, the titanium calcium type should be dried at 150 degrees for 1 hours, the low a hydrogen type should be dried at 200-250 C for 1 hours (not repeated drying, otherwise the skin is easy to crack and peeling), prevent the electrode from sticking oil and other dirt, so as to avoid the increase of carbon content and the quality of welding parts.

　　3. When stainless steel Weld neck flanges are welded, carbides are repeatedly heated to reduce corrosion resistance and mechanical properties.

　　4. The hardened ASTM A182 316L RF Stainless Steel Weld Neck Flanges of chrome stainless steel Weld neck flanges is larger and easy to crack. If the same type of chromium stainless steel electrode (G202, G207) is welded, it must be preheated at temperatures above 300 and 700 degrees slow after welding. If the weldment cannot be heat treated after welding, stainless steel Weld neck flanges electrode (A107, A207) shall be used.

　　5, stainless steel Weld neck flanges, in order to improve corrosion resistance and weldability and appropriately increase the amount of stability elements Ti, Nb, Mo and so on, weldability is better than the chromium stainless steel Weld neck flanges. When using the same type chromium stainless steel flange electrode (G302, G307), it should be preheated at temperatures above 200 c and tempered at 800 C after welding. If the weldment can not be heat-treated, stainless steel Weld neck flanges (A107, A207) shall be used.

　　6, stainless steel Weld neck flanges, butt welding flange electrode has good corrosion resistance and oxidation resistance, widely used in chemical, fertilizer, petroleum, medical machinery manufacturing.