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
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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.Abstract: Metal transfer mode and arc shape of rutile type flux cored wire with different shielding gas of 100% CO2 and 80% Ar+20% CO2 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% CO2. 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% CO2 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% CO2, but which appear during metal transfer for 80% Ar+20% CO2 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.
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Keywords:
- metal transfer /
- flux cored wire /
- shielding gas /
- arc shape
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