Abstract
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 (β). The results showed that the width of the columnar grains zone gradually reduced with increased β, and it disappeared when β increased to 60°. When β 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 β. When β reached 60°, the maximum tensile strength and elongation 320 Mpa and 5%, respectively, were acquired. It was concluded that the enhancement of weld property depended on porosity decreasing and microstructure refinement.
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