应用激光, 2018, 38 (4): 601, 网络出版: 2018-10-06   

钢/铝激光加热辅助搅拌摩擦焊接数值模拟研究

Numerical Simulation Investigation on Friction Stir Welding with Laser-assisted Heating between Steel and Aluminum
作者单位
1 广州市昊志机电股份有限公司, 广东 广州 510000
2 绍兴文理学院机械与电气工程学院, 浙江 绍兴 312000
3 绍兴市上虞区产品质量监督检验所, 浙江 绍兴 312300
摘要
钢铝激光辅助搅拌摩擦焊的温度场直接影响焊接接头的质量。为了研究工艺参数对温度场分布的影响并且缩小试验时工艺参数的可选择范围, 首先建立了激光加热以及搅拌头摩擦生热双热源数学模型, 然后采用COMSOL软件对Q235钢和Al 6061铝合金, 在不同工艺参数的条件下进行温度场的计算, 重点分析了激光光斑半径、激光功率、搅拌头下压力、进给速度和旋转速度对温度场的影响规律, 并选取了合理的工艺参数范围。最后对比分析了激光加热辅助搅拌摩擦焊接与普通搅拌摩擦焊接温度场的不同之处。结果表明, 激光预热使搅拌摩擦焊轴肩覆盖区域的最高温度由轴肩后方部转移到轴肩中部。此外, 当搅拌头下压力过大, 焊接进给速度过小, 旋转速度过大时, 摩擦产生的热量越多, 从而温度升高越明显。
Abstract
The temperature field has a great effect on the quality of the welded joints during laser assisted friction stir welding of steel and aluminum. In order to study the influence of process parameters on the distribution of temperature filed and narrow the range of process parameters during the experiment, a dual heat source mathematical model of laser heating and friction head heating were developed first. The temperature field of Q235 steel and 6061 aluminum alloy was calculated by COMSOL software under different process parameters. The influences of laser spot radius, laser power, pressure under stirring head, feed speed and rotation speed on the temperature field was analyzed in detail, and the range of reasonable process parameters was selected. Finally, the differences between the laser-assisted friction stir welding and the common friction stir welding temperature field were compared and analyzed. The results show that the maximum temperature area was transferred from the rear of the shoulder to the middle of the shoulder by the laser preheating. In addition, the higher the pressure is under the stirring head, the faster the welding feeding speed and rotating speed are, then the more heat the friction generates. As a result, the more obviously the temperature rises.

叶颖, 费鑫江, 李俊, 金亮亮, 姚蔚峰. 钢/铝激光加热辅助搅拌摩擦焊接数值模拟研究[J]. 应用激光, 2018, 38(4): 601. Ye Ying, Fei Xinjiang, Li Jun, Jin Liangliang, Yao Weifeng. Numerical Simulation Investigation on Friction Stir Welding with Laser-assisted Heating between Steel and Aluminum[J]. APPLIED LASER, 2018, 38(4): 601.

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