高强钢T型接头MAG焊接温度场研究

Study on MAG Welding Temperature Field of High Strength Steel T-joint

采用双椭球热源模型,对S690高强钢T型接头焊接温度场进行数值模拟,并通过搭建MAG焊接温度场测试平台,验证焊接温度场的仿真结果,研究了焊接速度对高强钢焊接温度场、熔池形状和热循环曲线的影响。结果表明：模拟所得的焊缝峰值温度和跟踪点400℃以上的焊接热循环曲线与试验结果较吻合,验证了所选的双椭球热源模型的合理性。随着焊接速度增加,焊缝金属的温度梯度变小,焊缝的熔宽、熔深和余高减小,同时焊缝峰值温度变小。

The welding temperature field of S690 high strength steel T-joint was simulated by using double ellipsoid heat source model, and the MAG welding temperature field test platform was set up to verify the accuracy of simulation results of welding temperature field. The effect of welding speed on the temperature field, weld pool shape and thermal cycle curve of the high strength steel were analyzed. The results show that the weld＇s peak temperature and the trace point＇s thermal cycle curve above 400 ℃ are in good agreement with the test results, which verifies the rationality of double ellipsoid heat source model. With the increase of welding speed, the weld metal＇s temperature gradient becomes smaller, and the weld width,penetration depth and reinforcement decrease, and the weld＇s peak temperature becomes smaller.