单组分活性剂对铝合金A-TIG焊焊缝的影响  

Effect of single-component activating flux on weld morphologies in A-TIG welding of aluminum alloy

作　　者：严铿[1] 高莉华[1] 杨刚[1] 肖海林[1] 

机构地区：[1]江苏科技大学先进焊接技术省级重点实验室,镇江212003

出　　处：《焊接学报》2013年第2期54-57,62,共5页Transactions of The China Welding Institution

基　　金：江苏科技大学本科生创新计划资助项目(2012);江苏高校优势学科建设工程资助项目PAPD

摘　　要：针对6 mm的6061铝合金试板,选用SiO2,TiO2,Cr2O3,CaF2,BaCl2共5种单一成分活性剂进行铝合金交流A-TIG焊工艺试验,研究活性剂对A-TIG焊焊缝表面成形及宏观形貌的影响,并结合焊接过程电弧形态变化,分析熔深增加机理.结果表明,5种单一成分活性剂均可改善焊缝熔深,其中SiO2增加焊缝熔深效果最好,CaF2效果不明显;涂覆SiO2时表面成形比涂覆其它活性剂时差,其中TiO2表面成形最好;电弧进入活性剂区时无明显收缩,认为熔深增加是活性剂的引入导致导电通道电阻变化引起的电弧热输入增加的结果.A-TIG welding experiments of 6 mm 6061 aluminum alloy were carried out to investigate the effects of activating fluxes on weld appearance and macroscopic morphologies by using five kinds of single-component activating fluxes such as SiO2,TiO2,CaF2,Cr2O3 and BaCl2.The mechanism to increase weld penetration was analyzed by considering the change of arc shape in A-TIG welding process.The experimental results indicate that all the above activating fluxes improve weld penetration.The most remarkable effect is obtained when the flux is SiO2,but the effect of CaF2 on penetration is not obvious.The weld appearance is poor when the base metal is coated with SiO2,while good weld appearance can be obtained when the flux of TiO2 is used.The phenomenon of arc contraction is not remarkable when the arc moves into the flux zone.The significant improvement of weld penetration may be the result of increase in heat input caused by the change of resistance in conducting channel.

关 键 词：铝合金 A-TIG焊 活性剂 焊缝成形 

分 类 号：TG456.9[金属学及工艺—焊接]