关键词: 车载, 振动, 电弧增材制造, 形貌, 性能

Abstract: At present, the application scope and prospects of the battlefield environment additive manufacturing and maintenance support system have become relatively clear. Wire arc additive manufacturing technology has the advantages of high deposition efficiency and strong environmental adaptability, which can quickly complete the repair work and enable equipment to be quickly put into use on the battlefield. However, how to perform real-time manufacturing and repair in a mobile vehicle environment remains a challenge. To investigate the potential of applying wire arc additive manufacturing to the manufacturing and repair of components on mobile platforms, a study was conducted under vehicle-induced vibrations ranging from 1.5 Hz to 5 Hz, focusing on the morphology, microstructure, and mechanical properties of low carbon steel specimens. The results indicate that with the increase in the vibration frequency of the vehicle platform, the acceleration of both the welding gun and the substrate continuously rises. This transition leads to a change from well-formed specimens to failed formations, with spattering and arc extinction becoming prevalent beyond 3 Hz. Correlation analysis reveals that the vibration of the welding gun has a more significant impact on the formation process compared to substrate vibration. Under steady-state conditions, the formed specimen exhibited tensile strength, yield strength, and elongation of 489 MPa, 385 MPa, and 0.34, respectively. In contrast, lower frequency vibrations contributed to grain size refinement and improved mechanical properties, achieving a maximum ultimate tensile strength of 501 MPa and maximum elongation of 0.35. However, higher frequency vibrations led to coarser grain structures, a slight reduction in mechanical properties, resulting in reduced tensile strength of 483 MPa and elongation of 0.31. Crucially, higher frequency vibrations caused deterioration in the appearance of the formed parts, hindering successful formation and ultimately failing to meet manufacturing requirements. Overall, this study provided a solid experimental foundation for realizing "anytime, anywhere" wire arc additive manufacturing in combat units.

Key words: vehicle, vibration, wire arc additive manufacturing, morphology, performance