Study of cracking susceptibility in similar and dissimilar welds between carbon steel and austenitic stainless steel through finger test and FE numerical model

Hot cracking susceptibility and the formation of brittle martensite phase are main factors that limit weldability a dissimilar joint between carbon steel (CS) austenitic stainless (SS). In this study, self-constraint finger test was used to correlate welding thermo-mechanical field with crack weld CS ASTM A36 SS AISI 304L. The allowed intercalate fingers (portions) tested materials in samples produce welds. heat dissipation distortion behavior were related susceptibility, critical regions extension, chemical species diffusion. Four welded (two similar welds two welds) using filler metals ER70S-6 EC410NiMo. Welds analyzed through light optical microscopy (LOM) scanning electron (SEM) characterize phases, detect cracks, microstructural changes, element A finite (FE) numerical model applied simulate field. FE estimations residual stress helped predict induced propagation (the initial gap fingers) towards fusion zone. Additionally, electrochemical tests carried out assess corrosion observed cracks produced due different such as distribution, untempered martensitic zone (FZ), hot associated sample behavior. According estimations, high thermal expansion responsible for bending curvature change 2 4, which increased extension FZ 4. dilution contributed δ-ferrite FZ, limited growth cold cracks. decarburization sensitization not low