Cautions for use of stainless steel weld neck flange

1. In order to prevent interocular corrosion caused by EN1092 Stainless Steel Forged Weld Neck Flange cover heating, the welding current should not be too large, 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 using the electrode, it should be kept dry. The Ti-Ca type should be dried at 150 ~250 ~C for 1 hour. The low-a hydrogen type should be dried at 200~250 ~C for 1 hour to prevent sticky oil and other dirt on the coating of the electrode, so as to avoid increasing the carbon content of the weld and affecting the quality of the stainless steel weld neck flange.

　　3. When stainless steel weld neck flange is welded, carbides are precipitated by repeated heating, which reduces the corrosion resistance and mechanical properties.

　　4. The hardening flange of chromium stainless steel weld neck flange is larger and easy to crack. If the same type of chromium stainless steel welding rod is used, it must be preheated above 300 ~C and slowly cooled after 700 ~C. If the weldment can not be heat treated after welding, stainless steel weld neck flange welding rod should be selected.

　　5. Stainless steel weld neck flange in order to improve its corrosion resistance and weldability, appropriate addition of stability elements Ti, Nb, Mo, etc., has better weldability than chromium stainless steel weld neck flange. When using the same type of chromium stainless steel weld neck flange welding rod, it should be preheated above 200 and tempered around 800 after welding. If the weldment can not be heat treated, stainless steel weld neck flange welding rod should be selected.

　　6. Stainless steel weld neck flange electrode has good corrosion resistance and oxidation resistance, which is widely used in chemical industry, fertilizer, petroleum, medical machinery manufacturing.