Electrochemical behavior of dissimilar carbon-stainless steel RSW joints

Abstract

In the present investigation, the electrochemical behavior of dissimilar welds between austenitic stainless steel and low-carbon steel obtained by resistance spot welding was investigated. The results obtained showed the formation of martensite in the fusion zone produced elevated hardness values (∼ 480 HV) and was detrimental to the corrosion resistance of the material in acid media (0.5M H2SO4 containing naturally dissolved O2). The susceptibility of the welded joints to hydrogen embrittlement was studied by applying cathodic charging in acid solution, which led to a 42 ± 5% reduction in maximum elongation compared to noncharged specimens.