The effect of different welding methods on joints’ microstructure and properties of A240-S32205 duplex stainless steel was studied. The result showed all joints using GTAW and SMAW can attain good phase ratio and corrosion resistance. But the comprehensive mechanical characteristics of joint using GTAW was better than that of SMAW joint with acid electrode. Besides, the low temperature impact performance was not ideal in joints manual welded with acid electrode. The HAZ was identified as a weak zone where the corrosion resistance was the worst and in which the third detrimental metallic phase was more liable to emerge than in weld zone.