Comparative analysis for joint performance of duplex stainless steel by different arc welding methods

The welding tests are conducted on 15 mm thick plates of duplex stainless steel 2205 by three different arc welding methods(SMAW,TIG and SAW),and the microstructure,mechanical property and corrosive property of welded joints are analyzed.The results indicate that the phase ratio of ferrite in weld metal and heat-affected zone of the joints is controlled between 30%-60%,the tensile strength of the joints is near the same as that of base metal,the impact absorbed energy of weld metal by TIG and SAW at -40℃ is 133 J and 78 J respectively,higher than 37 J of SMAW significantly,and impact absorbed energy of heat-affected zone in the joint welded by SAW at -40℃ is 207 J,higher than 122 J of TIG and 109 J of SMAW because of its lowest total heat input.In the temperature range from -60℃ to 20℃,the impact absorbed energy of weld metal and heat-affected zone in the joint welded by TIG is higher than that of SMAW.The pitting corrosion resistance of the joints welded by TIG and SAW is near the same,better than that of SMAW.The comprehensive property of TIG joint is the best,and then that of SAW,last the SMAW.