铝合金P-MIG焊接电流对电弧形态的影响  

Analysis for the influences of aluminum alloy P-MIG welding parameters on welding arc

作　　者：陆志强[1,2] 华学明[1,2] 李芳[1,2] 吴毅雄[1,2] 

机构地区：[1]上海交通大学材料科学与工程学院,上海200240 [2]上海市激光制造与材料改性重点实验室,上海200240

出　　处：《焊接学报》2009年第12期105-108,共4页Transactions of The China Welding Institution

摘　　要：通过对铝镁合金进行脉冲氩弧焊(P-MIG),在相同平均电流和平均电压工作条件下,调节不同峰值电流和基值电流,获得了不同的电弧形态.峰值电流对电弧形态有着重要的影响,而基值电流基本没有影响.基值电流是维持电弧燃烧的参数,在基值时间阶段,必须给定一个足够大的基值电流才能维持电弧的稳定燃烧.文中定义了电弧形态的表征值,针对电流对电弧形态表征值的影响进行了分析.峰值电流是决定电弧温度和脉冲能量的重要参数,铝合金电弧充分燃烧时电弧长度、电弧宽度和电弧纵向截面面积随着峰值电流增加而增加.Under the same average welding current and welding voltage,by regulating the different based current and peak current,the Al-Mg alloy was welded with Al-Mg filler wire.The photos of welding arc were obtained by using high-speed video photography.Peak current has great influence on the shape and characteristics of the arc.With increasing the peak current value,rotated arc appears and pulsed rotated metal transfer behavior occurs.Based current has little influence on the arc shape.Base current is the important parameter for keeping arc burning.At pulse off time,it must be given base current value which is large enough to keep the arc burning stably.In this study,the arc shape is defined by arc length,arc width and arc portrait cross-section area,which will be influenced by the weld current.Peak current is important parameter of arc temperature and pulse energy.The study shows that when the arc is burning at pulse on time,the arc length,arc width and arc portrait cross-section area increase with raising peak current.

关 键 词：铝合金 电弧形态 脉冲氩弧焊 电流 

分 类 号：TG115.28[金属学及工艺—物理冶金]