1. Submerged arc welding has certain advantages, such as high weld quality, high productivity, and good working conditions, but it also has many disadvantages:
1. Submerged arc welding requires Relying on granular flux to cover the arc to form protective conditions can only be applied to horizontal plane prone welding. Although vertical welding and horizontal welding have been studied, they have not been widely used because they have no significant effect.
2. The main components of the flux are metals and non-metal oxides such as MnO and SiO2. It is difficult to weld highly oxidizing metals and their alloys such as aluminum and magnesium.
3. It is only suitable for long welding seam welding. The productivity of short welding seam welding is not as good as manual arc welding.
4. The chemical composition of the flux determines that the arc column potential gradient of submerged arc welding is large. When the current is less than 100A, the arc stability is poor, so it is not suitable for welding thin plates with a thickness of less than 1mm.
2. Compared with submerged arc automatic welding, electrode arc welding has the following characteristics:
(1) The welding line energy is small, the weld metal grains are fine, and the mechanical properties of the welded joint are poor. good.
(2) It is easy to operate and adaptable, and is suitable for welding of different steel types, various positions and various structures.
(3) The equipment is simple and the investment is small.
(4) Low production efficiency.
(5) Welders have high labor intensity.
(6) Welder skills determine welding quality.