高氮钢超音频脉冲GMA增材制造熔滴过渡特性  

Droplet Transfer Characteristics of High Nitrogen Steel in Ultrasonic Frequency Pulsed GMA Additive Manufacturing

作　　者：马立 范霁康 从保强[2] 杨东青 彭勇[1] 王克鸿[1] MA Li;FAN Jikang;CONG Baoqiang;YANG Dongqing;PENG Yong;WANG Kehong(Key Laboratory of Controlled Arc Intelligent Additive Manufacturing Technology of Ministry of Industry and Information Technology,Nanjing University of Science and Technology,Nanjing 210094,Jiangsu,China;School of Mechanical Engineering&Automation,Beihang University,Beijing 100191,China)

机构地区：[1]南京理工大学受控电弧智能增材技术工业和信息化部重点实验室,江苏南京210094 [2]北京航空航天大学机械工程及自动化学院,北京100191

出　　处：《兵工学报》2024年第10期3686-3695,共10页Acta Armamentarii

摘　　要：针对高氮钢增材制造熔滴过渡过程中氮元素逸出及飞溅问题,进行超音频脉冲熔化极气体保护(Ultrasonic Frequency Pulsed Gas Metal Arc,UFP-GMA)增材制造熔滴过渡试验,研究不同超音频脉冲电流叠加模式和脉冲电流频率对高氮钢熔滴过渡稳定性的影响,获取能够实现高氮钢增材稳定熔滴过渡的工艺参数。试验结果表明:在脉冲熔化极气体保护(Pulsed Gas Metal Arc,P-GMA)增材工艺条件下可以实现一脉一滴过渡,但是过渡稳定性较差,飞溅明显;在P-GMA基值阶段或基值和峰值阶段都叠加超音频脉冲电流均不利于熔滴过渡,容易出现短路、熔滴爆炸等问题;在P-GMA峰值阶段叠加低频(20 kHz)脉冲电流时,对熔滴过渡影响较弱,叠加中频(40~60 kHz)脉冲电流能抑制高氮钢熔滴过渡中大颗粒飞溅生成,提高熔滴过渡稳定性,但是当频率超过60 kHz时在过渡中会形成许多小飞溅。For solving the problems of nitrogen escape and splash in the droplet transfer process of high-nitrogen steel additive manufacturing,the experiment of droplet transfer in an ultrasonic frequency pulsed gas metal arc(UFP-GMA)additive manufacturing is carried out,and the influences of different ultrasonic frequency pulsed current superposition modes and pulse current frequencies on the stability of high-nitrogen steel droplet transfer are studied,The process parameters that can realize the stable droplet transfer of high-nitrogen steel additives were obtained.The experimental results show that the of one-pulse-one-droplet transfer can be realized under the pulsed gas metal arc(P-GMA)process conditions,but the transition stability is poor and the splash is obvious.Superimposing the ultrasonic frequency pulse current at the base current stage of P-GMA or both at the base and peak current stages is not conducive to the droplet transfer,and the problems such as short circuit and droplet explosion are prone to occur.When the low-frequency(20 kHz)pulse current is applied during the peak stage,its effect on droplet transfer is minimal.However,the medium-frequency(40-60 kHz)pulse currents can be superimposed to inhibit the generation of large particle splash,leading to improved stability in droplet transfer,but many small splashes will be formed during the transition when the frequency exceeds 60 kHz.

关 键 词：超音频脉冲电流 高氮钢 增材制造 熔滴过渡 

分 类 号：TG403[金属学及工艺—焊接]