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首页> 美国卫生研究院文献>Materials >Experimental and Numerical Assessment of Temperature Field and Analysis of Microstructure and Mechanical Properties of Low Power Laser Annealed Welded Joints
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Experimental and Numerical Assessment of Temperature Field and Analysis of Microstructure and Mechanical Properties of Low Power Laser Annealed Welded Joints

机译：低功率激光退火焊接接头温度场的实验和数值评估以及显微组织和力学性能分析

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摘要

In this present work, laser welding experiments were carried out on 1 mm thin Ti6Al4V sheets using a low power Nd-YAG laser machine without using any filler wire and without edge preparation of welding specimens. The influence of different major process control parameters such as welding speed and power on the yield parameters like temperature field, weld bead geometry, microstructure, and mechanical properties are critically investigated. Experimental results are compared in detail with the simulated results obtained using a commercial 3D finite element model. In the simulation model, temperature-dependent thermal and mechanical properties of plates were considered. The temperature readings were recorded with the aid of K type thermocouples. Forced convection has been assumed near weld zone region because of the movement of the shielding gas. Appreciable agreement is found between the experimental and the simulated temperature fields in most of the cases with few exceptions. These deviations on few occasions may be due to the presence of uncertainties inherently present in the experimental domain and uncertainties in the subsequent temperature sensing techniques by the thermocouples. In addition, annealing has been done at 950 °C, 980 °C, and 1010 °C for one selected parameter (192 W, 6 mm/s). The tensile strength of the samples annealed at 980 °C has been found to be 1048 MPa and it is 3% to 4% higher than that of the usual welded samples.
机译：在本工作中，使用低功率Nd-YAG激光机在1毫米薄的Ti6Al4V板上进行了激光焊接实验，而没有使用任何填充焊丝，也没有对焊接样品进行边缘处理。严格研究了不同的主要过程控制参数（如焊接速度和功率）对屈服参数（如温度场，焊缝几何形状，微观结构和机械性能）的影响。将实验结果与使用商业3D有限元模型获得的模拟结果进行详细比较。在仿真模型中，考虑了板的温度相关的热和机械性能。借助K型热电偶记录温度读数。由于保护气体的运动，在焊接区域附近已假定强制对流。在大多数情况下，在实验温度场和模拟温度场之间找到了相当的一致性，只有少数例外。在少数情况下，这些偏差可能是由于实验领域固有的不确定性以及热电偶随后的温度传感技术中的不确定性所致。此外，对于一个选定的参数（192 W，6 mm / s），已经在950°C，980°C和1010°C下进行了退火。已发现在980°C退火的样品的拉伸强度为1048 MPa，比通常的焊接样品高3％至4％。

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