Abstract
The gas metal arc weldability of 1.5 GPa grade martensitic (MART) steel was evaluated using both inverter direct current (DC) and DC pulse power type welders, under conditions of different welding currents, welding speeds, and shielding gasses. By investigating the bead appearance, tensile strength, and arc stability, it was determined that DC pulse power is better than inverter DC power for arc welding of 1.3 mm thick 1.5 GPa grade MART steel. Further, from the results of the weldability for various shielding gases, it was determined that mixed shielding gas is more effective for welding 1.5 GPa grade MART steel than is pure inert gas (Ar) or active (CO2) gas. In the case of pure shielding gas, no sound bead was formed under any conditions. However, when the mixed shielding gas was used, sound and fine beads were obtained.
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Hwang, I., Yun, H., Kim, D. et al. Gas metal arc weldability of 1.5 GPa grade martensitic steels. Met. Mater. Int. 24, 149–156 (2018). https://doi.org/10.1007/s12540-017-7188-5
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DOI: https://doi.org/10.1007/s12540-017-7188-5