Characteristics of CO2 welding:

Characteristics of CO2 welding:

(1) Under the high temperature of the welding arc, CO2 decomposes into CO, O2, and O, which exerts a strong compressive effect on the arc. This results in an arc shape with a smaller arc column diameter and a smaller arc root area, often making it difficult to cover the entire molten droplet at the end of the welding wire. Therefore, the molten droplet experiences greater resistance during transfer (spot force), leading to droplet coarsening, poorer axiality of the transfer path, and a high spatter rate;

(2) Provides good protection to the welding area. CO2 has the highest density among commonly used shielding gases, and its volume increases after thermal decomposition, thus providing better protection;

(3) Relatively concentrated energy and strong penetration ability;

(4) Low production cost and energy saving;

(5) The process and technology also offer advantages such as good visibility of the welding area, facilitating observation and operation; smaller heat-affected zone and welding deformation; smaller molten pool volume and faster crystallization speed, resulting in good all-position welding performance; and low sensitivity to rust and contamination.