焊剂片约束电弧焊T形接头温度场有限元模拟

为了研究构成I型金属三明治板的基本焊接单元T形接头在焊剂片约束电弧焊(flux bands constrained arc,FBCA)作用下的温度场分布规律,以非线性有限元软件ABAQUS为平台,开发了适用于FBCA焊接T形接头温度场计算的有限元方法.对比了计算结果与测量结果的同时,研究了面板与芯板各自路径上的热量分布情况.结果表明:FBCA焊T形接头面板部位温度场沿焊缝中心呈对称分布,接头热量主要集中作用于面板处.采用复合热源模型计算所得特征点热循环曲线分布规律与实际红外热像仪测量结果重合度较高,计算所得焊缝截面温度分布形貌和热影响区宽度与实际接头形貌相吻合,有效验证了复合热源模型计算FBCA焊接T形接头温度场的准确性.

Numerical simulation of temperature field of flux bands constrained arc welding T-joint

In order to investigate the distribution law of temperature field of flux bands constrained arc (FBCA) welding in T-joint which is the basic welding unit of I-core sandwich panel, a computational approach was developed to predict the temperature field of T-joint by FBCA welding based on ABAQUS nonlinear finite element software. The calculated results were compared with the actual measurement results, and the heat distribution on the respective paths of the face and the core plate were studied. The result showed that the temperature field of T-joint in FBCA welding is symmetrically distributed along the weld center, and the heat distribution is mainly concentrated on the face plate. The combined heat source model can not only precisely simulate the temperature distribution morphology of weld section and the width of heat affected zone compared with the experiment, but also have a good agreement about the thermal cycle of typical points measured by the IR camera, which verifies the rightness of the combined heat source model in calculating the temperature field of T-joint in FBCA welding.