Arc welding: the technology
For shielded arc welding, an arc, a steel wire and a shielding gas are required. The arc constitutes the heat source. The welding wire that is fed automatically and the workpiece are melted and can thus be joined.
Certain gases are additionally used to protect the molten metal against oxidation.
- For metal active gas welding (MAG), active shielding gases are used, such as CO2, or mixed gases containing CO2 or O2.
- Metal inert gas welding (MIG) is carried out using inert shielding gases, such as argon, helium or mixtures of these gases.