Precautions for the stainless steel flange during the installation process In order to prevent the intergranular corrosion formed by heating the stainless steel flange cover, the welding current should not be too large. At this time, the current needs to be about 20% smaller than the carbon steel electrode, the arc should not be too long, the interlayer should be cooled quickly, and the weld should be reduced.
When welding stainless steel flange pipe fittings, repeated heating will precipitate carbides, thereby reducing corrosiveness and mechanical functions. The stainless steel flange pipe fittings simply crack after welding. If the same type of stainless steel electrode is used for welding, preheating above 300 degrees Celsius and slow cooling of about 700 degrees Celsius after welding can prevent the flange pipe from cracking.
If the weldment cannot be heat treated after welding, the appropriate stainless steel flange pipe electrode should be selected. In order to improve corrosion resistance and weldability, in the case of stainless steel flanges, appropriately increase the stability elements of titanium, niobium, molybdenum, etc. Should increase. When using the same type of stainless steel flange electrode, it should be preheated above 200 degrees Celsius and tempered at about 800 degrees Celsius after welding.
If the weldment cannot be heat treated, the appropriate stainless steel flange pipe fitting electrode should be selected. The stainless steel flange has good metal function and strong corrosiveness. It is often used in steel structures. The metal surface of the stainless steel flange is lubricated and is not simply oxidized by air. Therefore, it is often used in high-pressure water pipes and corrosive pressure pipes, and does not have the excellent functions of rust steel flanges.