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首页> 外文期刊>Journal of Manufacturing Processes >Effect of relative position in low-power pulsed-laser-tungsten-inert-gas hybrid welding on laser-arc interaction
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Effect of relative position in low-power pulsed-laser-tungsten-inert-gas hybrid welding on laser-arc interaction

机译：低功率脉冲激光-钨极-惰性气体混合焊接中相对位置对激光-电弧相互作用的影响

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摘要

In laser-arc hybrid welding, the appropriate position between the laser beam and arc will be helpful in forming an intensive interaction and significantly increasing penetration depth. In this paper, first, an orthogonal experiment with three factors and four levels were carried out on the inclination angle of the welding torch, the arc length, and the distance between laser beam and TIG electrode,Dla, to find the optimal positional parameters with the strongest laser-arc interaction. The composite plasma behaviors and interaction mechanism between laser and arc were then analyzed under different position parameters; on this basis, the influence of laser power on the laser-arc interaction was further analyzed. Results reveal that the interaction is a decided difference under different positions. When the distanceDla is small, the arc will be significantly compressed; when the laser acts on the arc center, the pre-heating of the arc will greatly improve the laser absorption rate, a shorter arc length will help to further increase the penetration. When the distanceDla, the arc length, and the welding torch angle are 1.5, 1 mm, and 45°, respectively, the laser-arc interaction reaches its strongest level and the weld penetration is the deepest. In this case, the arc tail is obviously shortened, and the laser-arc composite plasma volume in the central region is greatly increased. Further, when the laser-power percentage is 10%–50%, the weld profile shows the characteristics of laser heat-conduction welding; when the laser-power percentage is 50%–80%, the weld profile shows the characteristics of laser deep penetration welding; and when the laser-power percentage is 80%–100%, the valid penetration is shallow and accompanied by a large splash due to the very short laser duration. But the weld profile should also be characterized by typical laser deep-penetration welding when the duration of laser action is enough long.
机译：在激光电弧混合焊接中，激光束和电弧之间的适当位置将有助于形成密集的相互作用并显着增加熔深。本文首先对焊枪的倾斜角度，电弧长度以及激光束与TIG电极之间的距离Dla进行了三个因素，四个层次的正交试验，以找到最佳的位置参数。最强的激光电弧相互作用。然后分析了不同位置参数下复合等离子体的行为和激光与电弧之间的相互作用机理。在此基础上，进一步分析了激光功率对激光-电弧相互作用的影响。结果表明，相互作用是不同位置下的决定性差异。当distanceDla小时，电弧将被显着压缩；否则，电弧将被压缩。当激光作用于电弧中心时，电弧的预热将大大提高激光吸收率，较短的电弧长度将有助于进一步增加穿透力。当距离Dla，电弧长度和焊炬角分别为1.5、1 mm和45°时，激光-电弧相互作用达到其最强水平，并且焊缝熔深最深。在这种情况下，弧尾明显缩短，中心区域的激光电弧复合等离子体体积大大增加。此外，当激光功率百分比为10％–50％时，焊缝轮廓显示出激光导热焊接的特性。当激光功率百分比为50％–80％时，焊缝轮廓显示出激光深熔焊的特征。当激光功率百分比为80％–100％时，由于激光持续时间非常短，有效的穿透力会很浅，并伴有较大的飞溅。但是，当激光作用的持续时间足够长时，焊接轮廓也应通过典型的激光深熔焊来表征。

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