Stainless steel welding rods can be divided into chromium stainless steel welding rods and chromium-nickel stainless steel welding rods. All the welding rods that meet the national standard of these two types shall be assessed according to the provisions of the national standard GB/T 983-2012. Chromium stainless steel has certain corrosion resistance (oxidizing acid, organic acid, cavitation), heat resistance and corrosion resistance. It is usually selected as equipment materials for power stations, chemical industry, petroleum, etc. However, chromium stainless steel generally has poor weldability, and attention should be paid to welding process, heat treatment conditions and selection of suitable welding rods. Chromium-nickel stainless steel welding rods have good corrosion resistance and oxidation resistance, and are widely used in chemical industry, fertilizer, petroleum, and medical machinery manufacturing. In order to prevent intergranular corrosion caused by heating, the welding current should not be too large, about 20% less than that of carbon steel welding rods, the arc should not be too long, the interlayer should be cooled quickly, and a narrow weld is preferred.