Commonly used CO2 welding wire diameters (mm): 0.6, 0.8, 1.0, 1.2, 1.4, 1.6, 2.0, 2.4, 2.5, 3.0, 3.2, 4.0, 5.0, 6.0, etc. Different welding wire diameters use different welding current, arc voltage and other parameters, and also show different fusion transition forms and arc behaviors. The diameter of the welding wire we usually use is summarized into three types:
Filament
The thin wire is a welding wire with a diameter of less than 1.2mm. Generally, the welding is performed in the form of a short-circuit transfer. It is characterized by low arc voltage and small current, and is suitable for welding thin plates and for all-position welding. When welding thin plates, the productivity is high and the deformation is small. Moreover, it is easy to master in operation and does not require high welder technology. In addition, due to the small welding parameters, the light radiation, heat radiation and welding fumes during the welding process are relatively small, so it is widely used in production. The diameter of the welding wire using short-circuit transfer welding is up to 1.6mm. For example, if the welding wire over 1.6mm is short-circuit welding, the spatter is quite serious, and it is rarely used in actual production.
Middle wire
The middle wire is a welding wire with a diameter of 1.6~2.5mm. Generally, the droplets are welded in the form of fine particle transition. It is characterized by larger current and higher arc voltage, and the droplets fall into the molten pool in the form of free fall in a smaller size. When fine particles are transferred, the arc penetrating power is strong, and the wood penetration is large, which is suitable for welding medium and thick plates.
Thick wire
Thick wire is a welding wire with a diameter of 2.5 to 6.0 mm, generally submerged arc welding is used. It is characterized by large current and low arc voltage. The end of the welding wire and the arc dive into the pit of the molten pool, and the molten droplet transfers to the molten pool through the arc space at a high speed with fine particles smaller than the diameter of the welding wire. The welding process is smooth, no short circuit occurs, and the spatter is small. It is one of the methods of high-speed welding.
