工艺参数对立向分体等离子弧增材制造过程的影响  

Effect of process parameters on twin-body plasma arc additive manufacturing at vertical position

作　　者：张瑞英 薛龙[1] 蒋凡[2] Zhang Ruiying;Xue Long;Jiang Fan(Beijing Institute of Petrochemical Technology,Beijing 102617,China;Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京石油化工学院,北京102617 [2]北京工业大学,北京100124

出　　处：《焊接》2024年第7期1-6,共6页Welding & Joining

基　　金：国家自然科学基金青年项目(51905008);先进焊接与连接国家重点实验室开放课题(AWJ-24M08)。

摘　　要：【目的】为探究分体等离子弧增材制造过程中工艺参数对立向增材成形的影响,以单道熔覆层宽度和高度为评价指标对其展开研究。【方法】基于构建的立向分体等离子弧增材制造系统,通过单因素变量法研究了立向位置时丝/总电流比、离子气流量、丝材端部位置等工艺参数对熔覆层成形的影响,分析了工艺参数与基板热输入和熔敷率的关联机制。【结果】结果表明,当总电流保持不变时,丝材电流的增加会显著改善熔覆层成形,熔覆层宽度减小、高度增加;当离子气流量增加时,电弧等离子流力增强,使熔覆层宽度增加、高度减小;当送丝速度增加时,丝材端部靠近电弧中心,传质增加、传热减小,使熔覆层宽度减小、高度增加;丝材电流增加时,通过改变系统热、质、力的传输使熔覆层尺寸变化,而基板电流增加时,仅通过改变热、力传输使熔覆层尺寸变化。【结论】当总电流不变时,可采用提高丝/总电流比、减小离子气流量、丝材端部位置远离基板等措施减小基板的热输入并提高熔覆率,或直接增加丝材电流以提高熔覆率,进而实现高效增材制造。该研究将为分体等离子弧增材制造工艺在空间位置增材制造领域的拓展应用提供一定的理论指导。[Objective]To investigate the effect of process parameters on vertical additive forming in twin-body plasma arc additive manufacturing,the width and height of single-pass cladding layer were used as evaluation indexes.[Methods]Based on the construction of vertical twin-body plasma arc additive manufacturing system,and the effect of process parameters such as the ratio of wire/total current,plasma gas flow rate and end position of wire on cladding layer forming was studied by single factor variable method.The correlation mechanism of process parameters and substrate heat input with cladding rate was analyzed.[Results]The results showed that when the total current remained unchanged,the formation of cladding layer could be improved significantly with the increase of wire current,and the width of cladding layer decreased and the height of cladding layer increased.With the increase of plasma gas flow rate,the width of cladding layer increased and the height of cladding layer decreased due to the increase of plasma flow force.When the wire feeding speed increased,the position of the wire was close to the arc center,the width of cladding layer decreased and the height of cladding layer increased as the mass transfer increased and the heat transfer decreased.When wire current increased,the size of cladding layer changed by changing the transmission of heat,mass and force in the system.When the substrate current increased,the size of cladding layer changed by changing the heat and force transmission.[Conclusion]When the total current remained constant,the heat input to the substrate could be reduced and the cladding rate could be increased by increasing the wire/total current ratio,decreasing the plasma flow rate,and moving the end of the wire away from the substrate,or directly increasing the wire current to increase the cladding rate,so as to achieve efficient additive manufacturing.This study wasexpected to provide theoretical guidance for applicating the twin-body plasma arc additive manufacturing process in the fiel

关 键 词：分体等离子弧 立向位置 工艺参数 熔覆层成形 

分 类 号：TG456.2[金属学及工艺—焊接]