多道焊温度场数值模拟及其分布规律的研究

NUMERICAL SIMULATION OF MULTIPASS WELDING'S TEMPERATURE FIELD AND STUDY OF TEMPERATURE DISTRIBUTION RULES

采用单元'死活'的方法进行了三维状态下低碳钢多层多道焊温度场的数值模拟,实现了模拟过程中焊接材料的逐步填充,计算结果与试验结果十分吻合。在此方法的基础上进行了厚板LY16高强铝合金多层多道焊的数值模拟,对其温度场分布规律进行分析,研究了焊道间隔时间对温度场分布的影响,通过计算每一焊道节点的最大温度升高值做出了节点最大温升一节点距焊道中心线距离关系曲线,根据此曲线可在实际焊接中方便地预测构件焊后不同部位的组织和性能。

Low carbon steel's temperature field of multi-pass welding is numerically modeled by element's 'birth' and 'death' technique. Welding material can be deposited step by step during this modeling. Computation results are anastomotic well with experimental results. On the basis of this method, high-strength thick LY16 Al-alloy plant's multi-pass welding is numerically modeled and its temperature field's distribution regularities are analyzed. Bead interval's influence to the distribution of temperature fields is studied. Maximum temperature rise during each pass of welding is calculated and plotted against the distance from the weld pad centre line. From the plot, component's tissue and properties at different position after welding can be estimated.