Effects of CMT Working Modes on Forming Properties of WAAM 4043 Aluminum Alloy
Different working modes of CMT welding machine were utilized to investigate the single-layer and single-pass forming of 4043 aluminum alloy by wire and arc additive manufacturing process,and single-wall specimens were prepared by multi-layer and single-pass forming.Effects of working mode on microstructure and mechanical properties of specimens were analyzed.The results indicate that the high residual height coefficient in CMT-pulse mode leads to desirable spreadability,while the lower residual height coefficient in the CMT-Advanced mode leads to poorer spread-ability.The CMT working mode has a significant impact on the microstructure,porosity,and mechanical properties of specimens.The grain in specimens fabricated by CMT-pulse+advanced mode is finer and more uniform,with a mini-mum percentage of 4.88%,where the transverse and longitudinal tensile strength of the single-wall specimens are 148 MPa and 138 MPa,respectively,which are higher than those in the rest CMT modes,and a minimum tensile strength anisotropy of 6.8%is also obtained.
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