摘要:
对于波控短路过渡CO2焊,电弧峰值电流Ipa,电弧基值电流Iba以及由峰值电流切换到基值电流所用的时间(拖尾时间tw)等电流波形参数是可调的,它们对过渡稳定性和焊缝质量具有很大影响,利用正交试验,对不同送丝速度下电流波形参数进行了优化.结果表明,电弧峰值电流的影响最大.送丝速度为320 cm/min时,电流波形参数Ipa,Iba和tw无论如何调整,飞溅率均在2.5%以上,焊缝表面质量差;送丝速度为360~400 cm/min时,最优电流波形参数为:Ipa=440 A,Iba=50 A,tw=0.6 ms.而在400 cm/min的送丝速度下,在宽广的电流波形参数范围内(Ipa为440~480 A,Iba为30~50A,tw为0.6~0.8 ms)均可获得飞溅率极低、焊缝表面质量好的稳定焊接过程.
Abstract:
For controlled short circuiting transfer GMAW, peak current Iap, background arcing current Iab and tail-out time tw (time required for welding current to decrease from Iap to Iab) are the adjustable waveform parameters, which have significant influence on the process stability, spatter rate and weld appearance. Using orthogonal experiment method, waveform parameters were optimized at different wire feeding rate. The results show that peak welding current has the strongest influence among the three waveform parameters. At wire feeding rate of 320 cm/min, the spatter rate is more than 2.5%, the weld appearance is always rough and bad no matter what levels of the waveforms parameters were used. With the wire feeding rate varying from 360 to 400 cm/min, the optimal waveform parameters keep constant, i. e. Ipa=440 A, Iba=50 A, and tw=0.6 ms. At wire feedingrate of 400 cm/min, the stable welding process with a spatter rate of less than 0.35% and excellent weld appearance can be achieved in quite wide ranges of waveform parameters(Ipa is 440-480 A, Iba is 30-50 A, and tw is 0.6-0.8 ms).
百度学术
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