双丝单弧气保焊熔滴过渡及焊缝成形  

Metal Droplet Transition and Welding Formation of Twin-wire Single-arc Gas Shielded Welding

作　　者：李志勇 李朋 胡广龙 张光先[1,2] LI Zhiyong;LI Peng;HU Guanglong;ZHANG Guangxian(College of Control Science and Engineering,Shandong University,Jinan 250101,China;Shandong Aotai Electric Co.,Ltd.,Jinan 250101,China)

机构地区：[1]山东大学控制科学与工程学院,济南250101 [2]山东奥太电气有限公司,济南250101

出　　处：《材料导报》2022年第18期160-164,共5页Materials Reports

基　　金：国家重点研发计划(2017YFB1103204);山东省重点研发计划(2020CXGC010207)。

摘　　要：双丝单弧气保焊是一种新型熔化极焊接方法,系统由单电源、单送丝机构和单焊枪组成,双丝共用一个具有两孔的导电嘴,单电源通过导电嘴同时向双丝输出电流形成单个电弧,双丝末端熔滴相互吸引形成共熔滴并稳定过渡到熔池。采用高速摄像、信息同步采集及焊接电源等装备,开发双丝单弧气保焊熔滴过渡试验系统,研究了不同焊接电流参数对熔滴大小、过渡行为及焊缝形貌的影响,并阐明了双丝单弧气保焊熔滴过渡机理。结果表明:随着焊接电流的增大,熔滴过渡形式依次为多脉一滴、一脉一滴、射流过渡和潜弧射流过渡四种模式,过渡频率逐渐增大,熔滴体积逐渐减小。焊缝形貌研究表明,随着焊接电流增大,焊缝熔深逐渐增大,熔宽先增大后减小,当焊接电流为570 A时,焊缝截面成形质量最佳,此时熔敷速度为15.8 kg/h。Twin-wire single-arc gas shielded welding is a newly developed melting electrode welding method. The system consists of a single power source, a single wire feeding mechanism, a single welding torch. The twin wires share the contact tip with two holes, and the single power source supplies the twin wires simultaneously through the contact tip. The output current of the twin wires forms a single arc, and the droplets at the ends of the twin wires interact each other, forming a co-melt droplet and stably translating to the molten pool. Using the high-speed camera, information synchronization acquisition equipment and welding power source, a twin-wire single-arc gas shielded welding droplet transfer testing system is developed. The influences of welding current on the droplet size, transition behavior and weld morphology were investigated, and the droplet transfer mechanism of twin-wire single-arc gas shielded welding is elucidated. The results show that with the increasing of welding current, the transition frequency gradually increases and the droplet volume gradually decreases, so that the transition behavior of the molten droplet changes in four modes, which are multi-pulse one drop transition, one pulse one drop transition, spray transition and buried arc with spray transition. The weld morphology investigation shows that as the welding current increases, the weld penetration depth gradually increases, and the melting width firstly increases and then decreases. The best weld formation is obtained at the welding current of 570 A, and the correspon-ding deposition rate achieves 15.8 kg/h.

关 键 词：双丝单弧气保焊 焊接电流 熔滴过渡 焊缝成形 

分 类 号：TG444[金属学及工艺—焊接]