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首页> 外文期刊>Journal of Materials Engineering and Performance >Factors Controlling the Magnesium Weld Morphology in Deep Penetration Welding by a CO_2 Laser
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Factors Controlling the Magnesium Weld Morphology in Deep Penetration Welding by a CO_2 Laser

机译：控制CO_2激光深熔焊接中镁焊接形态的因素。

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摘要

In laser welding with power density beyond 40~4 W centre dot mm~(-2), the formation of plasma cavities, commonly referred to as keyholes, leads to deep penetration welds with high aspect ratios. In this paper, the morphologies of keyhole welds produced with a 6 kW CW CO_2 laser on two die-cast magnesium alloys, AZ91 and AM50, are compared. It was found that the two magnesium alloys responded differently to laser welding. Though irregular weld cross-section profiles were consistently observed on each material, bead dimensions often varied with the welding variables in contrasting ways. For both alloys, important characteristics of the welding parameters, most particularly the heat input. Results show that the use of heat input, a variable grouping two welding parameters into one, was often inadequate in characterizing the bead morphology. Several explanations are given, including base metal vaporization, but the process of bremsstralung absorption explains it well and rationalizes many observed characteristics of laser weld morphology.
机译：在功率密度超过40〜4 W中心点mm〜（-2）的激光焊接中，等离子腔（通常称为键孔）的形成会导致深熔焊道具有高深宽比。在本文中，比较了用6 kW CW CO_2激光在两种压铸镁合金AZ91和AM50上产生的小孔焊接的形貌。发现两种镁合金对激光焊接的反应不同。尽管在每种材料上都能观察到不规则的焊缝横截面轮廓，但焊缝尺寸通常以不同的方式随焊接变量而变化。对于两种合金，焊接参数的重要特性，尤其是热量输入。结果表明，使用热量输入（一个将两个焊接参数组合为一个变量的变量）通常不足以表征焊缝的形貌。给出了几种解释，包括贱金属的汽化，但是致吸收的过程很好地解释了这一点，并使许多观察到的激光焊接形态特征合理化。

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