Abstract
Three different shielding gas nozzles were designed for the narrow-gap laser-MIG hybrid welding of thick-section steel. Different gas flow behaviors produced by the three nozzles exerted great effects on the welding characteristics. While using the straight-trapezium shielding gas nozzle, unstable droplet transfer behavior with spatters and welding current wave were observed due to the unstable and high velocity of shielding gas. The weld with a mass of pores in a honeycomb distribution at the surface was produced by using the straight-trapezium nozzle, since the aft part of the molten pool could not be protected effectively during the welding process. Stable droplet transfer behavior and current wave were realized; qualified welds almost with no pores at the surface were obtained by using the square-outlet nozzle with boss or circle-outlet nozzle with boss.
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Cai, C., Li, L. & Tai, L. Narrow-gap laser-MIG hybrid welding of thick-section steel with different shielding gas nozzles. Int J Adv Manuf Technol 92, 909–916 (2017). https://doi.org/10.1007/s00170-017-0179-3
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DOI: https://doi.org/10.1007/s00170-017-0179-3