Carbon Dioxide Gas Shielded Welding

  Carbon dioxide gas shielded welding, commonly referred to as CO₂ welding, is a welding process that uses carbon dioxide gas as a protective gas to prevent harmful substances such as oxygen and water vapor from contaminating the molten metal. It is suitable for materials like carbon steel, low-alloy steel, and stainless steel.

  Welding characteristics: CO2 welding has the advantages of high welding productivity, low tendency to produce cold cracks, low energy consumption, and a wide range of applications. However, there are also issues such as metal spatter, rough weld appearance, and weak wind resistance.

  Key points for operation: Before starting welding, complete equipment inspection and parameter settings to ensure a stable arc and proper gas protection. When stopping welding, delayed gas supply is required to prevent the high-temperature molten pool from coming into contact with air. During the operation, the welding torch nozzle must be kept clean, and the angle of the torch should be adjusted to accommodate different welding positions.

  Process parameters: The selection of welding current and voltage depends on the diameter of the welding wire and the welding method (short-circuit transition or fine particle transition) For example, when using a Φ1.2mm welding wire in short-circuit transition, the current is 90-150A and the voltage is 19-23V; in fine particle transition, the current is 160-400A and the voltage is 25-38V.

  Application scope: CO2 welding can be used in various scenarios such as steel structure bridges, pipeline welding, large structure welding, lifting equipment welding, and energy efficiency equipment maintenance. It is suitable for welding in various positions including flat welding, vertical welding, horizontal welding, and overhead welding.