In this paper, the droplet transfer behavior, geometric characteristics of weld bead and formability of CMT MIX+ Synchropulse (CSP) wire + arc additively manufactured Inconel 718 alloy under high wire feeding speed are studied. The results show that a CSP cycle is composed of a CSP high-frequency pulse stage (CSP-HFP) and CSP-CMT stage, and the periods ratio is about 1.7:1. The high frequency and large average welding current of CSP-HFP increase the arc force, which further increases the droplet impact force on the molten pool. The molten pool is significantly deformed, resulting in the penetration depth of the CSP weld bead (1.8 mm) apparently higher than that of CMT (0.5 mm). The surface of the CMT-WAAM sample is more rough and irregular. The large penetration depth provides sufficient support for the molten pool, which promotes the overall stability of the molten pool. The increase of the droplet impact and arc forces enhance the convections in the molten pool, which finally suppresses the overflow phenomenon.

本文研究了CMT MIX+同步脉冲（CSP）焊丝+电弧增材制造的Inconel 718合金在高送丝速度下的熔滴转移行为、焊道几何特征和成形性。结果表明，一个CSP周期由CSP高频脉冲级（CSP-HFP）和CSP-CMT级组成，周期比约为1.7:1。CSP-HFP的高频和大的平均焊接电流增加了电弧力，进一步增加了熔滴对熔池的冲击力。熔池明显变形，导致CSP焊道的熔深（1.8 mm）明显高于CMT（0.5 mm）。CMT-WAAM 样品的表面更加粗糙和不规则。大的穿透深度为熔池提供了足够的支撑，这促进了熔池的整体稳定性。熔滴冲击和电弧力的增加增强了熔池中的对流，最终抑制了溢出现象。