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Notes for use of Steinless steel flange

2021-04-24 13:26:58
1. In order to prevent the corrosion between the eyes caused by the heating of the flange cover, the welding current should not be too large, about 20% less than the carbon steel electrode, the arc should not be too long, the interlayer should be cooled quickly, and the narrow weld bead is suitable.
 
2. The welding rod should be kept dry when used, 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. dry for 1 hour (do not dry repeatedly, otherwise the coating is easy to crack and peel off), prevent the coating, 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, carbide precipitates after repeated heating, which reduces the corrosion resistance and mechanical properties.
 
4. Chromium stainless steel flange pipe has large hardenability after welding, which is easy to crack. If the same type of chromium stainless steel welding rod (g202, G207) is used for welding, it must be 300 ° Preheat and post weld 700 C above ° Slow cooling treatment of about C. If post weld heat treatment cannot be carried out on the weldment, the welding rod of stainless steel flange (A107, A207) should be selected.
 
5. In order to improve the corrosion resistance and weldability of stainless steel flange, appropriate amount of stable elements such as Ti, Nb and Mo are added. The weldability of stainless steel flange is better than that of chromium. When using the same type of chromium stainless steel flange electrode (G302, G307), it should be 200 mm ° Preheat and post weld above 800 C ° About C. If the weldment cannot be heat treated, the welding rod of stainless steel flange (A107, A207) should be selected.
 
6. Stainless steel flange pipe and butt welding flange electrode have good corrosion resistance and oxidation resistance, and are widely used in chemical industry, chemical fertilizer, petroleum and medical machinery manufacturing.

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