Duplex steels tend to change properties in the zone of thermal influence when exposed to the welding thermal cycle. This study presents the investigation results of the mechanical properties, corrosion-resistance, phase composition and hardness of the base metal, the heat affected zone and the weld metal of super duplex stainless steel SAF 2507 pipes joints ø 89×15,0 maded by Manual TIG Welding with the using of forced interlayer cooling.