Influence of Arrangement on Laser-MIG Hybrid Horizontal Welding Characteristics of Aluminum Alloy

doi:10.3901/JME.2016.10.084

Abstract

Abstract: Aiming at the defects such as undercut and collapse on weld seam surface in the conventional laser-metal inert gas(MIG) hybrid horizontal welding process of aluminum alloy, study upon the characteristics of different arrangements on laser-MIG hybrid horizontal welding of aluminum alloy is conducted. The experimental results show that, non-coplanar leading hybrid welding could reduce the weld width, improve the weld formation and effectively suppress the centerline deviation and undercut defect. When adopting the coplanar arrangement hybrid welding, the droplet transferred into the rear of keyhole, and the accumulation of the molten metal appearing in the lower areas of the pool with periodic fluctuation resulted in the stratification of weld solidification structure. However, when adopting the non-coplanar arrangement way, the droplet transferred below the keyhole and the landing position of droplets in the molten pool was above the coplanar leading way. In addition, the droplet transition frequency is slightly lower, which lead to a more uniform distribution of molten metal in the molten pool, and the accumulation metal in the lower areas decreased, effectively suppressing the undercut and collapse defects.

Key words: aluminum alloy, arrangement, horizontal welding, laser-MIG hybrid welding, welding characteristics

CLC Number:

TG456

CHEN Yanbin, LEI Zhenglong, YANG Yuhe, CHEN Xi, LI Ying. Influence of Arrangement on Laser-MIG Hybrid Horizontal Welding Characteristics of Aluminum Alloy[J]. Journal of Mechanical Engineering, 2016, 52(10): 84-90.

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