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Research on the characteristics of SM490A and SS400 structural steel welding.pdf
Abstract This study mainly discusses the effect of multi-pass welding under different heat input on the properties of the alloy, including microstructure, mechanical properties and corrosive properties, and tries to find out the optimal parameters and standardize the process before formulating All welding parameters ensure that different welding tools and personnel can achieve the same welding quality to meet the needs of the industry. The experimental technique uses inert gas shielded arc welding (Gas Shield Metal Arc Welding) for SM490A and SS400 heterogeneous welding. The weld bead in the heat-affected zone and the middle and lower layers will be subjected to a tempering or normalized heat treatment process after multiple passes, which can eliminate bad structures on the area (such as Federman ferrite) and effectively improve toughness , And reduce the hardness of the coarse grain area. The impact test results show that due to the different degree of grain refinement, the welding process with higher heat input will have a higher impact value, and its tensile strength will increase as the heat input increases.