Numerical simulation of AZ31B magnesium alloy in DE-GMAW welding process

作者：Zhang Chaoyang; Ma Guohong^*; Nie Jun; Ye Jia

来源：International Journal of Advanced Manufacturing Technology, 2015, 78(5-8): 1259-1264.

DOI：10.1007/s00170-014-6703-9

• AZ31B magnesium alloy
• DE-GMAW
• ANSYS
• Weld width

The prerequisite to predict the welding temperature field accurately is to select the thermal efficiency eta correctly. In this paper, the AZ31B magnesium alloy was used to study the thermal efficiency eta of the bypass arc in double-electrode gas metal arc welding (DE-GMAW) process. The experimental molten pool images were captured using a charge-coupled device (CCD) camera. Then, the molten pool size was extracted using an image-processing algorithm. A finite element model capturing the features of DE-GMAW welding was established by using ANSYS software. The simulated values of the molten pool size were obtained according to the numerical simulation results of the temperature field in DE-GMAW welding. By comparing the simulated molten pool sizes with the experimentally measured values, it was found that the best match is obtained when eta = 0.28 similar to 0.32. In addition, the simulation results show that when only the bypass current decreases, the weld width and the weld penetration depth, as well as the heat input of the base metal, increase. These results are in good accordance with the experimental observations.

• 出版日期2015-5
• 单位南昌大学