采用冷金属过渡加脉冲（CMT+P）电弧增材制造4043铝合金薄壁件，对比了不同工艺参数下薄壁件的成形性能，研究了成形性能良好薄壁件的组织与拉伸性能，并与CMT工艺下的进行了对比。结果表明：CMT+P工艺下，当焊接速度为8 mm·s^-1和送丝速度4 m·min^-1时，薄壁件的成形性能最好，且其成形效果接近CMT工艺下的；CMT+P工艺下薄壁件的单层组织由焊道上层的细晶区和焊道下层的粗晶区组成，焊道间存在穿过界面生长的粗大柱状枝晶，CMT工艺下的显微组织为分布均匀的细小柱状晶；CMT+P工艺下薄壁件的拉伸性能优于CMT工艺下的；CMT+P工艺下横向和纵向拉伸试样断裂方式均为韧性断裂，横向与纵向抗拉强度各向异性百分比仅为4%，说明薄壁件的力学性能不存在各向异性。

4043 aluminum alloy thin-walled parts were obtained by arc additive manufacturing under the conditions of cold metal transition with addition of pulse (CMT+P). The forming performance of thin-walled parts prepared under different parameters were compared. The microstructure and tensile properties of thin-walled parts with good forming performance were studied, and compared with those prepared by CMT process. The results show that when the welding speed was 8 mm·s^-1 and wire feeding speed was 4 m·min^-1, the forming performance of thin-walled parts prepared by CMT+P process was the best, and the forming effect was close to that prepared by CMT process. The microstructure of single layer of thin-walled parts prepared by CMT+P process consisted of fine-grained area in the upper layer and coarse-grained area in the lower layer, and there were coarse columnar dendrites growing through the interface between weld beads. The microstructure prepared by CMT process was fine columnar crystals with uniform distribution. The tensile properties of thin-walled parts prepared by CMT+P process were better than those under CMT process condition. The fracture modes of longitudinal and transverse tensile samples under CMT+P process condition were both ductile fracture and anisotropy percentage of longitudinal and transverse tensile streagth was only 4%, indicating there was no anisotropy in mechanical properties of thin-walled parts.