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Numerical Simulation of the Processes of Formation of a Welded Joint with a Pulsed ND:YAG Laser Welding of ZR-1%NB Alloy

机译:ZR-1%NB合金脉冲ND:YAG激光焊接形成焊接接头过程的数值模拟

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摘要

In recent years use of Zr-Nb alloys has increased in nuclear and chemical industry due to its corrosion resistance and enhanced strength compared to tin based ones. Welding of zirconium alloys is one of the most critical manufacturing processes for nuclear assembly production. To select suitable welding parameters to achieve quality weld, understanding of temperature and velocity fields during process in fusion zone and heat affected zone are essential. In the present study the Nd:YAG pulsed laser welding of zirconium alloy E110 was simulated using three-dimensional heat and fluid flow model. The convection mode of heat transfer and Marangoni stresses in fusion zone are two important mechanisms in controlling the heat transfer weld bead size. The calculated heating and cooling rates are of typical in laser welding and useful in microstructure study of fusion and heat affected zones. Experiments were carried with varying peak power, pulse frequency and duration using Nd:YAG pulsed laser on 0.5 mm thick sheets of E110 to form butt joints. The comparison of the results shows that the weld geometry is well matched with the numerical model.
机译:近年来,由于Zr-Nb合金具有比锡基合金更高的耐腐蚀性和更高的强度,因此在核工业和化学工业中的使用量有所增加。锆合金的焊接是核组件生产中最关键的制造工艺之一。为了选择合适的焊接参数以实现高质量的焊接,必须了解熔合区和热影响区的过程中的温度和速度场。在本研究中,使用三维热和流体流动模型模拟了锆合金E110的Nd:YAG脉冲激光焊接。传热的对流方式和熔合区的马兰戈尼应力是控制传热焊缝尺寸的两个重要机制。计算得出的加热和冷却速率在激光焊接中很典型,可用于研究熔合区和热影响区的微观结构。使用Nd:YAG脉冲激光在0.5毫米厚的E110板上形成对接接头,以变化的峰值功率,脉冲频率和持续时间进行实验。结果比较表明,焊缝几何形状与数值模型吻合良好。

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