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首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers, Part C. Journal of mechanical engineering science >Effects of thermal material properties on precision of transient temperatures in pulsed laser welding of Ti6Al4V alloy
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Effects of thermal material properties on precision of transient temperatures in pulsed laser welding of Ti6Al4V alloy

机译:热材料特性对Ti6Al4V合金脉冲激光焊接瞬态温度精度的影响

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摘要

This study investigates the effect of temperature-dependent material properties on the precision of a simulation in pulsed laser beam welding of Ti6Al4V alloy. Ti6Al4V is one of the most extensively used titanium alloys. The precision in transient temperature distributions developed in the thermal modeling part of a sequentially coupled thermo-mechanical simulation is crucial to the end results of structural mechanics. The temperature profile obtained by a finite element model at two distinct locations is validated by experimental results using temperature-dependent material properties. Then, the effect of assuming constant room temperature values for thermal conductivity, specific heat, and density on the temperature distribution is studied at different welding speeds. Temperature distributions are unaffected by the constant density assumption. The constant thermal conductivity assumption underestimates the peak temperatures far from the weld region, whereas the constant specific heat assumption overestimates these temperatures. This effect becomes prominent at low welding speeds. The temperature profile when conductivity and specific heat are assumed to be constant is nearly similar to that in the case of constant conductivity when conductivity and specific heat are assumed constant. Therefore, conductivity is the dominant variable. The constant conductivity assumption also restricts the heat flow from the weld to the edge region, thus increasing the size of the weld pool. This effect also becomes increasingly prominent at low welding speeds.
机译:本研究研究了温度依赖性材料特性对Ti6Al4V合金脉冲激光束焊接仿真精度的影响。 Ti6Al4V是最广泛使用的钛合金之一。在序贯耦合的热机械模拟的热建模中产生的瞬态温度分布的精度对于结构力学的最终结果至关重要。通过使用温度依赖性材料特性的实验结果,通过实验结果验证通过有限元模型获得的温度曲线。然后,在不同的焊接速度下研究了假设热导率,比热量和温度分布密度的恒定室温值的效果。温度分布不受恒定密度假设的影响。恒定的导热率假设低估了远离焊接区域的峰值温度,而恒定的比热假设高估这些温度。这种效果在低焊接速度下变得突出。当假定电导率和特定热量时,温度曲线是恒定的几乎与导电性和特定热量被恒定的电导率恒定的情况相似。因此,电导率是主导变量。恒定的电导率假设还将从焊接到边缘区域的热流限制,从而增加了焊接池的尺寸。这种效果在低焊接速度下也变得越来越突出。

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