Thermal and dynamic effects in electron beam welding cavities
Thermal and dynamic effects in electron beam welding cavities
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电子束焊接腔中的热效应和动态效应
DOI：
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发表时间：
1977
期刊：
影响因子：
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通讯作者：
D. Schauer
中科院分区：
文献类型：
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作者：
D. Schauer
本文对电子束焊接熔池内金属液表面沿着的温度分布进行了实验和分析研究。用窄带红外辐射高温计测量了空腔内的表面温度分布。腔温度测量的可用性允许的蒸汽压力和表面能力作为腔位置的函数进行估计。结果表明，在腔中发生了力的不平衡。据推测，在力不平衡的位置处，液体材料投影周期性地形成并移动到电子束的路径中。该突出部中的液体被驱动朝向底部，部分地填充腔。这个动作之后，电子束将液体推到一边，形成最大深度的空腔。然后重复该过程。预测空腔振荡频率的分析表明，合理的协议在焊缝根部测得的频率确定从焊缝截面。对不同深度的空腔中测得的温度分布进行研究，并结合力不平衡观测结果，解释了何时可能发生尖峰。提出了一个程序，用于确定一组给定的焊接参数的尖峰的趋势。这项研究的更多结果允许设计者先验地选择最佳的焊接参数集，以实现可预测质量的焊接。«少
An experimental and analytical study of the temperature distributions along the molten metal surface in an electron beam welding cavity is described. Surface temperature distributions in cavities were measured with a narrow band infrared radiation pyrometer. The availability of the cavity temperature measurements allowed estimates to be made for the vapor pressure and surface energy forces as a function of cavity position. The results indicated a force imbalance occurred in the cavity. It is postulated that at the location of the force imbalance a liquid material projection forms periodically and moves into the path of the electron beam. The liquid in this projection is driven towards the bottom, partially filling the cavity. This action is followed by the electron beam pushing the liquid aside to form a maximum depth cavity. This process is then repeated. An analysis for predicting cavity oscillation frequency shows reasonable agreement with frequencies measured at the weld root determined from weld sections. A study of the measured temperature distributions in cavities of varying depth combined with the force imbalance observations led to an interpretation of when spiking might occur. A procedure is proposed for determining the spiking tendency for a given set of weld parameters. Themore » results of this study permit a designer to select apriori the best set of weld parameters to achieve a weld of predictable quality.« less