Precautions of using Non-standard flanges
1, In order to prevent intergranular corrosion due to 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 layer is fast cold, and the narrow bead is suitable.
2, the electrode should be kept dry when used, titanium calcium type should be dried at 150 ° C for 1 hour, low a hydrogen type should be dried at 200-250 ° C for 1 hour (can not be repeated repeatedly, otherwise the skin is easy to crack and peel off), to prevent The electrode coating is sticky with oil and other dirt to prevent the weld from increasing the carbon content and affecting the quality of the weldment.
3. When stainless steel non-standard flange pipe fittings are welded, it is repeatedly heated to precipitate carbides, which reduces corrosion resistance and mechanical properties.