铝合金T型接头双激光束双侧同步焊接温度场模拟

为了掌握双激光束双侧同步焊接工艺特性并得到最优焊接工艺匹配参数,对由铝合金6156底板与6056桁条组成的T型焊接接头进行了有限元数值模拟和试验研究.在改进以往激光热源模型的基础上,模拟分析了不同工艺参数匹配条件下的激光焊接过程,获得了实际可行的工艺参数范围.同时研究了焊接功率和焊接速度对熔池形状的影响规律,结果表明:焊接功率和焊接速度对焊缝成形具有重要影响,且熔池形状的模拟结果与试验结果吻合良好.最终获得了最佳的焊接工艺参数,为大型客机铝合金壁板的双激光束双侧同步焊接提供了理论指导.

Numerical simulation of dual laser-beam bilateral synchronous welding for T-joint of aluminum alloy

In order to understand the technological characteristics of dual laser-beam bilateral synchronous welding(DLBSW)and optimize the technological matching parameters, both finite element numerical simulation and experimental study were carried out for the T-joints which were composed of 6156 aluminum alloy bottom plates and 6056 aluminum alloy stringers. Based on the modified laser heat source model, the laser welding process with different matching conditions of technological parameters was simulated and analyzed, and the practical and feasible range of technological parameters was obtained. Meanwhile, the influence of welding power and welding velocity on the welding pool shape was investigated. The results show that the welding power and welding velocity have significant influence on the welding seam formation, and the simulated results of welding pool shape agree well with the experimental results. Finally, the optimum welding technological parameters were obtained, which provides the theoretical guidance for the DLBSW of aluminum alloy panels of airbus.