1. In order to prevent inter-eye corrosion caused by the heating of the flange cover, the welding current should not be too large, about 20% less than carbon steel electrodes, the arc should not be too long, and the interlayer should be cooled quickly.
2. The electrode should be kept dry during use. The titanium-calcium type should be dried at 150 ° C for 1 hour, and the low-a hydrogen type should be dried at 200-250 ° C for 1 hour. The coating of the electrode sticks with oil and other dirt, so as not to increase the carbon content of the weld and affect the quality of the weldment.
3. When welding stainless steel flange pipe fittings, carbides are precipitated by repeated heating, which reduces corrosion resistance and mechanical properties.
4. The chrome stainless steel flange pipe fittings have large hardened American standard flanges after welding and are prone to cracks. If the same type of chromium stainless steel electrode (G202, G207) is used for welding, it must be preheated above 300 ° C and slowly cooled around 700 ° C after welding. If the weldment cannot be subjected to post-weld heat treatment, stainless steel flange pipe fitting electrodes (A107, A207) should be used.
5. Stainless steel flange, in order to improve the corrosion resistance and weldability, appropriately increase the appropriate stability elements Ti, Nb, Mo, etc., the weldability is better than chrome stainless steel flanges. When using the same type of chrome stainless steel flange electrode (G302, G307), it should be preheated above 200 ℃ and tempered at about 800 ℃ after welding. If the weldment cannot be heat treated, stainless steel flange pipe welding electrodes (A107, A207) should be used.
6. Stainless steel flange pipe fittings, butt welding flange electrode has good corrosion resistance and oxidation resistance, widely used in chemical, fertilizer, petroleum, medical machinery manufacturing.