Numerical simulation of large spot laser plus MIG arc brazing-fusion welding of Al alloy to galvanized steel

作者：Meng, Xiangmeng; Qin, Guoliang^*; Su, Yuhu; Fu, Banglong; Ji, Yang

来源：Journal of Materials Processing Technology, 2015, 222: 307-314.

DOI：10.1016/j.jmatprotec.2015.03.020

• Brazing-fusion welding
• Laser-arc hybrid welding
• Numerical simulation
• Al-steel joint
• Thermal process

A finite element model was developed to investigate the thermal process of large spot laser + MIG arc brazing-fusion welding. The laser was treated as a Gaussian plane heat source, the MIG arc was performed as a modified double ellipse Gaussian plane heat source, in which the arc distortion was taken into consideration and the overheated droplet was treated as a uniform body heat source. The calculated weld bead geometry and heat-affected width of zinc coating had good agreement with experimental results. The temperature field, especially for the brazed interface, showed non-uniform and asymmetric distribution. The thermal cycles at brazed interface had obvious bimodal characteristic at arc center and laser spot center and the high-temperature zone at the brazed interface was widened duo to the introduction of laser beam compared with conventional MIG brazing-fusion welding. A fundamental processing window was determined based on the founded model to satisfy a certain energy condition, in which the Al alloy was fully penetrated and steel plate was not melted.

• 出版日期2015-8
• 单位山东大学