Four sets of S31803 welded joints were welded using different protective gases and interpass temperature control schemes.The low temperature impact toughness,hardness,pitting resistance and ferrite content distribution were compared.It was found that controlling the interpass temperature≤ 150 ℃ could improve low temperature impact toughness,hardness and ferrite content,and the use of protective gas φ(Ar)98％+φ(N2)2％could improve the resistance pitting performance.It had certain reference value for guiding the development of S31803 welding process and on-site welding.
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