This study was carried out to investigate the influence of a sigma phase precipitation on the pitting corrosion resistance and microstructural change of super duplex stainless steels(UNS S32750). The welds made by FCAW (Flux Cored Arc Welding) were heat treated ($930^{circ}C$, $1080^{circ}C$, $1230^{circ}C$) and quenched. Based on the microstructural examination, it was found that the ${sigma}$ phase was formed in base metals and welds heat treated at $930^{circ}C$ while there were little ${sigma}$phases formed in base metals and weld metal experienced the relatively fast cooling from $1080^{circ}C$ and $1230^{circ}C$. On the other hand, the most weight loss due to pitting corrosion occurred in base and weld metals heat treated at $930^{circ}C$. It was confirmed that the pitting corrosion occurred in the phase boundaries of ferrite/sigma and austenite/sigma. The pitting corrosion resistance decreased owing to an increase in Cr, Mo depleted areas adjacent to the intermetallic phases such as ${sigma}$phases. The hardness was greatly increased due to the precipitation ${sigma}$phases.