precautions for using stainless steel flanges
Stainless steel flanges use notes: 1. In order to prevent the eye-eye corrosion due to the flange cover heating, the welding current should not be too large, about 20% less than the carbon steel electrode, the arc should not be too long, and the layers are fast cold, with a narrow welding path is appropriate. 2. The welding rod should be kept dry when used, titanium calcium type should be dried by 150℃ for 1 hour, low a hydrogen type should be dried by 200-250℃ for 1 hour (not repeated drying many times, otherwise the welding rod skin is easy to crack and peel off), to prevent the welding rod medicine skin sticky oil and other dirt, so as not to increase the carbon content and affect the quality of the welding joint. 3. When the stainless steel flange pipe fittings are welded, the carbide is precipitated by repeated heating to reduce the corrosion resistance and mechanical properties. 4, Chrome stainless steel flange pipe fittings after welding hardening American standard flange is large, easy to produce crack. If the same type of chromium stainless steel welding rod (G202, G207) is used, more than 300℃ of preheating and about 700℃ after welding must be cooling treatment. If the weld parts cannot undergo post-weld heat treatment, the stainless steel flange fittings shall be selected (A107, A207). 5. Stainless steel flange, in order to improve the corrosion resistance and soldability and appropriately increase the appropriate amount of stability elements Ti, Nb, Mo, etc., soldering is better than chromium stainless steel flange. Using the same type of chromium stainless steel flange electrode (G302, G307), more than 200℃ and about 800℃ after welding should be conducted for preheating treatment. If the weld parts cannot be heat treated, the stainless steel flange fittings shall be selected (A107, A207). 6. Stainless steel flange pipe fittings, welding flange welding strip has good corrosion resistance and oxidation resistance, widely used in chemical industry, chemical fertilizer, petroleum, medical machinery manufacturing.
