Abstract
The microstructure and intergranular corrosion resistance of 6 mm thick Type 301L-MT stainless steel joints welded by laser-MAG (metal active gas) hybrid welding were investigated. Double loop electrochemical potentiokinetic reactivation measurement (DL-EPR) and electrochemical impedance spectroscopy (EIS) were conducted to study the corrosion behavior of laser-MAG hybrid welded (LMHW) joints in a slightly oxidative medium (a solution of 0.5 mol/L H2SO4 + 0.01 mol/L KSCN). The results show that the weld metal mainly consists of austenite and δ-ferrite, while the base metal (BM) and heat affected zone are the rolled structure including the original austenite and lath martensite. The different parts of LMHW joints present diverse intergranular attack resistance as a result of the microstructural difference. BM shows the best corrosion resistance with average Ir/Ia ratio (Ir is the reactivation peak current density, and Ia is the activation peak current density) of not more than 1%. The results indicate that...
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