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首页> 外文期刊>The International Journal of Advanced Manufacturing Technology >Numerical and experimental investigation on weld formation during laser plus MIG hybrid fillet welding of aluminum alloy in horizontal position
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Numerical and experimental investigation on weld formation during laser plus MIG hybrid fillet welding of aluminum alloy in horizontal position

机译：铝合金激光加型混合圆角焊接在水平位置的数值和实验研究

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摘要

A three-dimensional transient model is proposed to investigate the weld formation during laser + metal inert gas (MIG) hybrid welding of aluminum alloy for horizontal fillet joint, which considers the coupling of keyhole, droplet, and liquid metal pool as well as the influence of joint geometry feature and welding position. An asymmetrical double-elliptic heat source is utilized to model the arc heat input and a conic heat source with increased peak heat density is used to describe the laser energy. The coordinate rotation is used to take into account the inclination of heat source and the related forces. According to the experimental and simulated results, weld formation mechanism of horizontal fillet joint is studied. At a lower laser power, the fluid flow pattern in hybrid welding is similar to that in MIG welding and a strong downward flow caused by both gravity and arc pressure occurs at the liquid metal zone of the vertical plate, leading to the accumulation of molten metal at the horizontal plate and the resultant weld asymmetry. At high laser power, a clockwise vortex appears above the keyhole. In this case, the sagging of liquid metal near weld pool surface due to effect of gravity is an important factor responsible for the asymmetry of fillet weld. Besides, with increasing laser power, the tendency of weld pool free surface sagging is enhanced to some extent and weld bead surface becomes concave.
机译：提出了一种三维瞬态模型来研究水平圆角接头铝合金激光+金属惰性气体（MIG）混合焊接期间的焊接形成，其考虑了锁孔，液滴和液态金属池以及影响的偶联联合几何特征与焊接位置。使用不对称双椭圆热源来模拟电弧热输入，并且使用增加的峰值热密度来描述激光能量的圆锥热源。坐标旋转用于考虑热源和相关力的倾斜度。根据实验和模拟结果，研究了水平圆角关节的焊接机理。在较低的激光功率下，混合焊接中的流体流动图案类似于MIG焊接中的流体流动图案，并且在垂直板的液态金属区处发生重力和电弧压力引起的强流量，导致熔融金属的堆积在水平板和所得焊缝不对称性。在高激光功率下，钥匙孔上方出现顺时针涡旋。在这种情况下，由于重力的影响，焊接池表面附近的液态金属的下垂是负责圆角焊缝不对称的重要因素。此外，随着激光功率的增加，焊接游泳池自由表面下垂的趋势在一定程度上增强，并且焊珠表面变得凹陷。

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