磁控A-TIG焊电弧形态及焊接接头组织性能的研究  

Study on arc shape and microstructure and properties of welded joint of magnetic control A-TIG welding

作　　者：姜兆栋 艾星宇 宋碧倩 苏允海[2] 

机构地区：[1]沈阳晨光弗泰波纹管有限公司,辽宁沈阳110141 [2]沈阳工业大学材料科学与工程学院,辽宁沈阳110870

出　　处：《焊接技术》2017年第12期16-19,共4页Welding Technology

摘　　要：为了分析磁场和活性剂对焊接过程和组织性能的影响,在A-TIG焊接过程中施加纵向交流磁场,采用高速摄影技术观察电弧运动形态,并对焊缝进行硬度、显微组织和物相组成进行分析,研究磁场和活性剂对镁合金焊缝性能及组织的影响规律,并对其中的作用机理进行探究。试验表明,磁场和活性剂对电弧形态、焊接接头的组织性能具有一定的影响效果,当磁场电流Im=1.5 A,磁场频率f=50 Hz,焊接电流I=80 A,涂覆量Q=3 mg/cm^2时,焊接接头的硬度最大,为HV73.16。在合适的磁场参数和活性剂配比下,电弧挺度最大、电弧收缩明显,此时电弧的搅拌作用致使焊缝组织出现明显的细化现象,且析出相Al12Mg17明显增多,这对改善接接头的力学性能具有积极的作用。In order to analyze the influence of magnetic field and active agent on the welding process and the microstructure and properties of welded joint, the longitudinal AC magnetic field was applied during the A-TIG welding process. The arc shape was observed by high speed photography technique, and the hardness, microstructure and phase composition were detected at the same time. The influence of magnetic field and active agent on the weld performance and microstructure of magnesium alloy was studied, and the mechanism of action was explored. The experimental results showed that the magnetic field and the active agent had a certain effect on the arc morphology and the microstructure and properties of the welded joint. When the magnetic field current was 1.5 A, the magnetic field frequency was 50 Hz, the welding current was 80 A, the coating amount was 3 mg/cm^2, the hardness of welded joint was the highest, HV73.16. Under the appropriate magnetic field parameters and active agent ratio, the arc stiffness was the largest and the arc shrinkage was obvious. At this time, the stirring effect of the arc caused the weld structure to be obviously refined, and the precipitation phase Al_(12)Mg_(17) was obviously increased, the mechanical properties had been improved for this.

关 键 词：磁场 活性剂 电弧形态 组织性能 镁合金 

分 类 号：TG406[金属学及工艺—焊接]