摘要
两焊芯熔化速度能否保持一致是双电极焊条单弧焊过程能否稳定进行的关键。研究表明,双电极焊条两焊芯熔化的一致性受焊条类型、焊接电流等因素的影响。双电极焊条两焊芯熔化一致的充分条件为U阳效等于U阴效,两者差值越大则焊芯熔化不一致程度越大。双电极焊条单弧焊电弧对两焊芯的熔化存在自调节作用,即电弧燃烧过程中两焊芯端部在电弧中的长度不等,两焊芯仍能保持等速熔化,使电弧燃烧过程能够稳定进行。电弧自调节作用原理是由于两焊芯端部在弧柱区的长度不同,伸入弧柱区中较长的焊芯从弧柱区获得更多的热量,而加快其熔化,从而起到电弧的自调节作用。一般随焊芯间距的减小及焊接电流的增大,电弧自调节作用增强。
Two cores melting speed can keep consistence is very important for twin electrode single arc welding to be stabilized.The melting consistency of two cores is influenced by electrode type,welding current etc.The sufficient condition of two cores melting coincidence is the effective anode drop equal to the effective cathode drop,the more the difference of two values the more the melting inconsistent degree.The arc has a self-regulating effect on melting of two cores,that is,during the arc burning,even if the ends of two cores have different length in the arc,two cores can keep uniformly melting speed,and the arc can stably burn.The principle of the self-regulating effect is that different heat production of cathode and anode make two cores length in the arc different.The longer weld core stretching into the arc column gets more heat from the arc column to accelerate its melting.In general,the self-regulation effect of arc increases with the reducing of two-core span and increasing of welding current.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2006年第4期61-63,80,共4页
Transactions of The China Welding Institution
基金
山东省自然科学基金资助项目(Z2002F03)
中国石油大学(华东)博士科研基金资助项目(Y040312)
关键词
双电极焊条
单弧焊工艺
焊芯熔化
自调节作用
twin electrode
single arc welding
two cores melting
self-regulation effect
