Abstract
Two different shielding gases, Ar + CO2 and Ar + He + N2, were used for MIG welding of a 20 mm 10CrNi3MoV steel plate. The effects of shielding gases on the chemical composition, microstructure, purity, and low-temperature impact toughness of weld metal were studied in detail. N-containing shielding gas can increase the nitrogen content in the weld metal, change the solidification mode of deposited metal, reduce ferrite content in the weld metal, and significantly improve the low-temperature impact toughness of deposited metal. The purity of weld in the ternary inert gas atmosphere is high, which is beneficial to the improvement of low-temperature toughness. The ferrite content of the ternary joint is higher than that of the binary joint, and the strength of the ternary joint is much higher than that of the binary joint.
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