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Narrow-gap laser-MIG hybrid welding of thick-section steel with different shielding gas nozzles

  • Chuang Cai
  • Liqun LiEmail author
  • Lei Tai
ORIGINAL ARTICLE

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.

Keywords

Narrow-gap laser-MIG hybrid welding Shielding gas nozzle Gas flow behavior Welding characteristics 

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Copyright information

© Springer-Verlag London 2017

Authors and Affiliations

  1. 1.State Key Laboratory of Advanced Welding and JoiningHarbin Institute of TechnologyHarbinChina

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