保护气体对金红石型药芯焊丝电弧行为影响分析  

Effects of shielding gas on metal transfer and arc shape of rutile type flux cored wire

作　　者：张英乔[1] 王宝[1] 王勇[2] 丁玲芳[1] 

机构地区：[1]中北大学材料科学与工程学院,太原030051 [2]太原理工大学材料科学与工程学院,太原030024

出　　处：《焊接学报》2017年第6期120-124,共5页Transactions of The China Welding Institution

基　　金：山西省自然科学基金资助项目(2012011021-1)

摘　　要：采用高速摄像装置及汉诺威弧焊分析仪分析了金红石型药芯焊丝在100%CO2及80%Ar+20%CO2气体保护焊时的熔滴过渡模式及电弧形态.结果表明,100%CO2气体保护焊时小、中、大参数均出现排斥过渡特征,随电弧电压与焊接电流增加,熔滴尺寸减小,过渡频率增加,出现滴状过渡,波形呈锯齿状;80%Ar+20%CO2气体保护焊时以滴状过渡为主,大参数时出现射滴过渡,波形近似直线.前者渣柱仅出现于熔滴形成长大的初期,后者在熔滴过渡全过程均有渣柱存在,且对熔滴过渡有一定的导向与稳定作用.这与电弧形态不同,熔滴与渣柱受电弧热作用的效果不同有关.Metal transfer mode and arc shape of rutile type flux cored wire with different shielding gas of 100% CO_2 and 80% Ar + 20% CO_2 have been researched by high speed camera and analysator hannover. The results show that the repel transfer characteristics are low,medium and high parameters in the case of 100% CO_2. Droplet size decreases and transfer frequency increases with the increase of arc voltage and welding current,Globular transfer are found at higher parameters and corresponding waveforms are serrated; In 80% Ar + 20% CO_2 globular transfer are considered on the main transfer mode. Projected spray transfer are observed at higher parameters,which bring near linear waveform. Slag column are found only at the early stage of droplet formation and growth for 100% CO_2,but which appear during metal transfer for 80% Ar + 20% CO_2 that act as orientation and stable on the metal transfer. This is related to different arc shape that results in different arc heating effect on droplet and slag column.

关 键 词：熔滴过渡 药芯焊丝 保护气体 电弧形态 

分 类 号：TG457.11[金属学及工艺—焊接]