The MIG-MAG welding is the most widespread welding technology because of the very preferable features. The melting rate and speed, remachnining and small dead work interval ensure high productivity and economical procedure. By this procedure high melting strength and excellent processing of thin sheets can be realised. In the case of steel, aluminium and stainless steel the MIG-MAG welding procedure can be universally applied in a very broad application field because of its simple handling. In the interest of increasing the production the tandem electrode variant of MIG-MAG equipment is frequently used