Influence of Process on 7075 Al-Alloy by Composite Arc Additive Manufacturing

A new technology of metal fused-coating additive manufacturing composite variable polarity tungsten inert gas (MFCAM and TIG) is adopted. Based on the analysis of the heat input during the forming process, the method for controlling morphology defects of thin-walled specimens is obtained. Considering the collapse of the starting and tail of the thin-walled samples, a new method is proposed to control the arc extinction by section attenuation. The wavy surface appearance caused by heat accumulation is solved by the combination control. The height direction stability of thin-walled specimens is improved by 8.2%. The thin-walled samples of aluminium alloy with material utilization more than 95% can be prepared, and the dimensional accuracy Wa is 0.42; thus, excellent sample would be obtained.