Analysis of bending property of dissimilar steels welded joints

The dissimilar steel welded joints were made between Q235-B carbon steel and 316L stainless steel by submerge arc welding using Y and I patterns of welding groove. Based on the observation and analysis of the microstructure,elements distribution and micro hardness in the weld fusion zone near the Q235-B base metal,the hard and brittle transition layer would form in the fusion area near the carbon structural steel, when the dissimilar steels were welded. The decrease of width of brittle transition layer is the most important to improve the bending property of the dissimilar steels welded joint. Furthermore, the influences of different welding procedures on the bending property of the welded joint were investigated. The process of Y pattern groove and Ni-riched welding wire can minimize the width of brittle transition layer and raise the bending property of the welded joint. Besides,this welding procedure also avoids the welding fault of burning through when the butt joint of the dissimilar thin steel was welded by submerged arc welding on the double sides.