镁合金的FZ-TIG焊接方法  

FZ-TIG welding of magnesium alloy

作　　者：樊丁[1] 牛书锋[1] 黄勇[1] 晏丽琴[1] 姜国峰[1] 

机构地区：[1]兰州理工大学甘肃省有色金属新材料重点实验室,甘肃兰州730050

出　　处：《兰州理工大学学报》2009年第4期23-25,共3页Journal of Lanzhou University of Technology

基　　金：甘肃省有色金属新材料国家重点实验室开放基金(SKL04002)的资助

摘　　要：针对镁合金材料,提出一种新型活性焊接方法FZ-TIG焊接方法.焊接前在待焊焊道表面中心区域涂敷低熔点、低沸点、低电阻率的活性剂,在2侧区域涂敷高电阻率的活性剂,然后进行正常TIG焊接,这样可以保证焊接熔深显著增加和焊接表面成形良好.结果表明,在相同参数下,与传统TIG焊相比,FZ-TIG焊接焊缝熔深达到常规TIG焊熔深的2.5倍.通过改变弧长分析活性剂对电弧极性区电压降和弧柱区电位梯度的影响,与TIG焊相比,FZ-TIG焊使得极性区电压降升高,而弧柱区电位梯度降低.A new method of activating welding for magnesium alloy materials—FZ-TIG welding was proposed.As for this method,an activating flux with low melting point,low boiling point and low resistivity was coated on the weld surface in its center region and an activating flux with high resistivity was coated on both side surfaces of the weld before the starting of TIG welding.Thus the weld penetration would significantly be increased and the weld surface appearance would be good.The result showed that under the identical welding parameters, the penetration of FZ-TIG welding was 2.5 times deeper than that of traditional TIG welding. The effect of activating flux on the voltage drop of arc polar region and potential gradient of arc column was analyzed by means of changing the arc length. Compared with traditional TIG welding, these activating flux coats could increase the voltage drop of arc polar region and reduce the potential gradient of arc column.

关 键 词：镁合金 活性剂 FZ-TIG焊 熔深 电弧 电压 

分 类 号：TG444[金属学及工艺—焊接]