diamondspark 700 MC metal cored wire manufactured with seamless technology is developed for shielded arc welding of thermo mechanically and quenched and tempered fine grained structural steels. The metallurgy combined with a very precise production technology results in high strength combined with very good toughness behaviour and excellent welding performance. This tubular wire possesses higher rigidity – as a result it offers exact ignition and excellent feeding characteristic. Due to the manufacturing technology, this metal cored wire ensures low diffusible hydrogen content of <2 ml / 100g. This metal cored wire is designed for welding under mixture gas (Ar + CO2) in PA and PB-position. Good results were also achieved after using alternative gases CO2, 8 – 10 % CO2 + Ar and different welding positions (PG). This filler material is used for high strength steel constructions, crane and vehicle manufacturing, for ship building, offshore applications and also for penstocks.