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The Effect of Shielding Gas Composition on High Power Laser Welding Characteristics

보호가스 종류에 따른 고출력 레이저 용접특성

  • Received : 2015.07.14
  • Accepted : 2015.08.27
  • Published : 2015.08.31

Abstract

Laser-gas metal arc hybrid welding has been considered as an alternative process of gas metal arc welding for offshore pipe laying. Fiber delivered high power lasers which enable deep penetration welding were recently developed but high power welding characteristics were not fully understood yet. In this study, the influence of shielding gas composition on welding phenomena in high power laser welding was investigated. Bead shapes, melt ejection and dropping were observed after autogenous laser welding with 100% Ar, Ar-20% $CO_2$, Ar-50% $CO_2$, and 100% $CO_2$ shielding gas. Process parameter window was widest with Ar-50% $CO_2$ shielding gas and the penetration was deepest with 100% $CO_2$ shielding gas. The melt dropping was not observed when Ar-50% $CO_2$ or 100% $CO_2$ shielding gas was supplied.

Keywords

High-power laser welding;Shielding gas;Process parameter window;Penetration depth;Melt ejection;Melt dropping

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