【摘要】 电弧增材制造技术是低成本金属零件快速成形的重要方法之一,零件的成形精度目前因电弧热输入量过高而无法精确控制,国内外使用冷金属过渡技术进行增材制造成为热点。交流冷金属过渡技术(Advanced CMT)既秉承了原冷金属过渡技术(CMT)无飞溅、焊速快、热输入量低的特点,又引入变极性的交流电模式,使焊接过程中的热量分布更合理,基材收到的热输入量进一步降低。通过对CMT技术和交流CMT技术的研究现状进行比较和分析,认为交流CMT技术以其更低的热输入量,更高的熔敷效率和焊接稳定性等优势而更适合应用于增材制造领域,并且下一步应该侧重于解决交流CMT技术下的凝固过程原位检测表征,以及热源模拟的进一步修正,为复杂件的精确成形奠定基础。更多还原

【Abstract】 Arc additive manufacturing technology is an important method of rapid prototyping of low-cost metal parts.Currently, forming precision of parts is not precisely controlled due to the high input of arc heat. The utility of cold metal transfer technology in domestic and abroad to make additive manufacturing becomes a hot spot. AC CMT(Advanced CMT) inherits the original cold-metal transfer technology(CMT) no spatter, fast welding speed, low heat input characteristics, and the introduction of variable polarity AC mode, so that the welding process of heat distribution More reasonable, the heat input received by the substrate is further reduced. By comparing and analyzing the research status of CMT technology and AC CMT technology, it is concluded that AC CMT technology is more suitable for additive manufacturing field due to its advantages of lower heat input,higher deposition efficiency and welding stability, and the next step should be to address the in situ detection characterization of the solidification process under AC CMT technology and the further correction of heat source simulations to provide a basis for the accurate shaping of complex parts.更多还原