三丝GMAW横焊工艺优化研究  

Study on optimization of the triple-wire GMAW process

作　　者：武钰栋 敖三三[1] 罗震[1] 张威 WU Yu-dong;AO San-san;LUO Zhen;ZHANG Wei(School of Material Science and Engineering,Tianjin University,Tianjin 300072,China)

机构地区：[1]天津大学材料科学与工程学院,天津300072

出　　处：《焊接技术》2018年第4期72-75,172,共5页Welding Technology

摘　　要：利用实验室搭建的三丝焊设备,通过对电弧电压、焊接电流、焊接速度、保护气体流量和焊枪倾角的控制和调节,选定三丝横焊高效且保证质量的焊接工艺参数组合。结果表明:焊枪倾角影响焊缝的成形,3支焊枪需要合理布置以保证焊接质量。随着焊接电流的增大,焊缝余高先减小后增大,但过大的焊接电流会导致焊缝下塌,同时,飞溅明显增大;随着电弧电压的升高,焊缝余高变小。最终经过优化得出工艺参数组合:辅助焊枪与水平面的夹角呈30°,焊接电流为I1=140 A,I2=155 A,I3=140 A,电弧电压为U1=22 V,U2=21 V和U3=22 V,焊接速度为2.25 m/min,保护气体流量为20 L/min,焊丝伸出长L1=L2=L3=20 mm。对焊缝的显微组织进行分析,发现焊缝中存在粗晶区,说明焊接过程中热输入很大。进行硬度测试,发现焊缝硬度明显提高,这是因为焊缝中产生了魏氏组织。The combination of arc voltage,welding current,welding speed,gas flow rate and welding gun angle was selected by means of triple-wire Gas Melt Arc Welding(GMAW)equipment built by laboratory.The results showed that the angle of the welding gun affected the forming of the weld,and the three welding guns needed the position to ensure the welding quality.As the welding current increased,the weld height decreased first,but too much welding current would cause the weld to drip and increased the splash.As the welding voltage increased,the weld height became smaller.The welding current was I1=140A,I2=155A,I3=140A,the arc voltage was U1=22V,U2=21V and U3=22V,the welding speed was the same as the angle of the auxiliary welding gun and the horizontal plane.For 2.25m/min,a protective gas flow rate of 20L/min and wire extension of L1=L2=L3=20mm.The microstructure of the weld was analyzed and it was found that there was a coarse grain area in the weld,indicating that the heat input during welding was very large.The hardness of the weld was significantly improved because of the weld produced Wei’s organization.

关 键 词：三丝熔化极气体保护焊 横焊 焊接工艺参数 焊缝成形 

分 类 号：TG444.74[金属学及工艺—焊接]