Carbon dioxide arc welding is a welding technology. It is used the carbon dioxide gas as shielding gas, and then welding. The main performance is the electric arc molten metal gas between the welding wire and the weldment, which can also be written as CO2 welding.
Today, we will focus on some related knowledge about the carbon dioxide arc welding, hoping through the introduction below, can make the reader has a certain understanding about the carbon dioxide arc welding.
In general, the short-circuit method is used to strike arc, and the larger diameter of the end of the welding wire should be cut out before striking arc to make it into the acute angle, so as to prevent the spatter at the time of welding. The distance between the end of the welding wire and the weldment should be 2 - 3 mm. The distance between the nozzle and the weldment should be 10 - 15 mm.
Press the welding torch switch first, then send carbon dioxide gas, electricity and wire, until the welding wire contacts the working surface and lead to the short circuit, igniting the electric arc. When the welding metal is fused, it is welded at normal welding speed.
If the straight bead welding is used, the weld width is narrow, the weld is high, and the penetration depth is shallow. The final welding end is easy to produce defects, so the corresponding measures should be taken.
If the starting welding end is adopted, the arc should be slightly elongated after striking the arc, and the starting end of the arc should be hold down after proper preheating of the end of the weld, which is favorable for forming a relatively neat weld.