Abstract
Keyhole tungsten inert gas welding (K-TIG) was used to join AISI 304 stainless steel with Q345 low-alloy steel of 8 mm thickness in a single pass. Welding formation and process windows in different welding speeds were discussed. Microstructure and welding properties of dissimilar joints were investigated. The results show that in a relatively high welding speed (more than 300 mm/min), high-quality weld of dissimilar steels can be obtained in the welding process window with a current of 50A. Weld microstructure is lath martensite and retained austenite. Proeutectoid ferrite and Widmanstatten structure are observed in Q345 heat-affected zone (HAZ) while no obvious grain growth is found in AISI 304 HAZ. Microhardness of the weld metal is much higher than the base metal because of the martensite structure in the weld. Tensile test was conducted with digital image correlation (DIC). The result shows that the tensile strength of the weld is almost the same as the Q345 base metal and the elongation is slightly reduced, indicating good qualities both in strength and plasticity.
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Huang, Y., Luo, Z., Lei, Y. et al. Dissimilar joining of AISI 304/Q345 steels in keyhole tungsten inert gas welding process. Int J Adv Manuf Technol 96, 4041–4049 (2018). https://doi.org/10.1007/s00170-018-1791-6
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DOI: https://doi.org/10.1007/s00170-018-1791-6