Notices in Welding Stainless Steel Flange

　　When stainless steel flange pipe fittings are welded, carbon compounds are precipitated by repeated heating, which decreases corrosion resistance and mechanical properties. Stainless steel flange is an important part of the pipeline, which plays an important role in connection. There are many kinds of stainless steel flange, and the standard is complicated. Because it mainly plays a connecting role, because of this, the main characteristics of stainless steel flange are the connecting mode and the tight sealing mode. The main influencing parameter is the pipe pressure. So what should we pay attention to?

　　1. In order to prevent interocular corrosion caused by stainless steel flange cover heating, the welding current should not be too uncomfortable, about 20% less than carbon steel electrode, the arc should not be too long, the interlayer cooling should be fast, and the narrow bead should be suitable.

　　2. When ANSI 2500 10inch Forged RF Stainless Steel Flange is welded, carbon compounds are precipitated by repeated heating, which decreases the corrosion resistance and mechanical properties.

　　3. The hardening flange of chromium stainless steel flanged pipe fittings after welding is larger and easy to crack. If it is suitable to use the same type of chromium stainless steel welding rod, it must be preheated above 300 ~C and slowly cooled around 700 ~C after welding. If the weldment can not be heat treated after welding, stainless steel flanged pipe welding rod should be selected.

　　4. Stainless steel flange, in order to improve the corrosion resistance and weldability, it is appropriate to increase the number of suitable stability elements Ti, Nb, Mo, etc. The weldability of stainless steel flange is better than that of chromium stainless steel flange.