Microstructure and mechanical properties in three-dimensional laser-arc hybrid welding of AA2219 aluminum alloy

The weld microstructure and property of the three-dimensional laser-arc hybrid welding of AA2219 aluminum alloy were studied in this paper. It is indicated that they were mainly influenced by the gravity-laser angle (beta). The results showed that the width of the columnar grains zone gradually reduced with increased beta, and it disappeared when beta increased to 60 degrees. When beta was constant, an optimized arc current value existed with which the best tensile property was obtained. The tensile property increased first then decreased with increased beta. When beta reached 60 degrees, the maximum tensile strength and elongation 320Mpa and 5%, respectively, were acquired. It was concluded that the enhancement of weld property depended on porosity decreasing and microstructure refinement.