1, you are a tank, it should be said that the pressure is not great, so you can directly use covered electrode arc welding. When A022 covered electrode is selected, a groove shall be made. After bottom welding, carbon arc gouging or grinding wheel should be used to clean the weld root. Whether single groove or double groove is opened, the welding seam of covering layer in contact with SO2 solution should be welded last.

2. The content of chromium and nickel in the coated covered electrode is slightly higher than that of the base material, but too high will increase the cost.

3. The choice of alloy steel welding material is to match the chemical composition, not low.

4. 16mm thick plate shall be welded without argon arc welding, and the welding root shall be cleaned.

5, argon arc welding is not needed alone, which is inefficient and increases the cost.