Metal Inert Gas (MIG)-Cold Metal Transfer (CMT) and Fiber Laser-MIG Hybrid Welds for 6005A T6: Experimental and Numerical Comparison

摘要

The microstructural and hardness properties of welded joints of AA 6005-T6 aluminum alloy obtained with metal inert gas (MIG), fiber laser-MIG hybrid, and cold metal transfer (CMT) welding were analyzed immediately after welding and after 3 years of natural aging. The fine hardening precipitation within the heat-affected zone, fusion zone, and base material was characterized by differential scanning calorimetry for the three different welding techniques. The elastic-plastic properties of the welded joints were characterized by means of finite element. For all investigations, the analysis on AA6005 aluminum alloy confirms a better behavior of CMT and fiber laser-MIG hybrid joints with respect to the conventional MIG processes. Graphic