Abstract: In this research, four different arc modes including conventional cold metal transfer (CMT), CMT-pulse (CMT-P), CMT-Advanced(CMT-ADV) and CMT pulse advanced (CMT-PADV) were used to deposit 2219-Al wire. The effects of different arc modes on porosity, pore size distribution and mechanical properties were given a thorough analysis. A number of multilayer thin-wall parts were fabricated to verify the suitable arc mode for the fabrication of 2219-Al alloy with excellent mechanical properties. The statistical analysis of the porosity and the size distribution indicated that the CMTPADV process gave the smallest pore area percentage, aspect ratio and had almost no larger pores. The tensile strength could reach to 280MPa for the as deposited 2219-Al samples both in horizontal and vertical directions by the CMT-PADV arc mode. In addition, large 2219-Al metal parts were fabricated by the most suitable arc mode.
Authors: Xuewei Fang, Lijuan Zhang, Hui Li, Chaolong Li, and Bingheng Lu
Keywords: Cold metal transfer; 2219-Aluminum; Additive manufacturing; Porosity; Mechanical property