•Electromagnetic interaction in welding improved localised corrosion resistance.•Electromagnetic interaction in welding enhanced γ/δ phase balance of DuplexSS.•Welding under Electromagnetic interaction repress formation and growth of detrimental phases.•Welds made with gas protection (2% O2+98% Ar) have better microstructural evolution during welding. The resistance to localised corrosion of AISI 2205 duplex stainless steel plates joined by Gas Metal Arc Welding (GMAW) under the effect of electromagnetic interaction of low intensity (EMILI) was evaluated with sensitive electrochemical methods. Welds were made using two shielding gas mixtures: 98% Ar+2% O2 (M1) and 97% Ar+3% N2 (M2). Plates were welded under EMILI using the M1 gas with constant welding parameters. The modified microstructural evolution in the high temperature heat affected zone and at the fusion zone induced by application of EMILI during welding is associated with the increase of resistance to localised corrosion of the welded joints. Joints made by GMAW using the shielding gas M2 without the application of magnetic field presented high resistance to general corrosion but high susceptibility to undergo localised attack.