Arc and Weld Pool Behavior for Pulsed Current GTAW
Arc and Weld Pool Behavior for Pulsed Current GTAW
复制标题
脉冲电流 GTAW 的电弧和熔池行为
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
W. Unkel
中科院分区：
文献类型：
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作者：
H. Saed;W. Unkel
为了确定频率对电弧柱和熔池的影响，对脉冲电流GTAW进行了实验研究。这项研究包括：1)光电二极管阵列，2)固定电弧熔化运行和3)分裂阳极实验。光电二极管阵列测量是实时观察和测量电弧通道宽度随输入电流变化响应的一种准确有效的方法。结果表明，在高频（f ~ 3000 Hz）的全正弦脉冲中，电流通道在时间上是“冻结”的，不随瞬时电流变化。固定电弧熔体实验证实，高频正弦脉冲比平均稳定电流水平下的焊缝更深。熔体运行使用正弦脉冲< 1 > = 150 A，振幅为120 A，频率变化。与平均稳定电流为150 A的熔体相比，在3000 Hz下制造的熔体深度增加了20%，而顶部宽度没有增加。结果表明，高频电流脉冲在不改变熔池顶部宽度的情况下，通过加深熔池来改变熔池的几何形状。因此，高频电流脉冲是一种有效的GTAW池几何控制方案。
An experimental study of pulsed current GTAW was conducted to determine the effects of frequency on the arc column and the weld pool. This investigation consisted of examining the process by: 1) a photo diode array, 2) stationary arc melt runs, and 3) split anode experiments. The photo diode array measurement was shown to be an accurate and effective method to observe and measure the response of the arc channel width to changes in the input current in real time. Results indicated that for full sinusoidal pulsing at high frequencies (f ~ 3000 Hz) the current channel was " f rozen" in time and did not change with the instantaneous current. Stationary arc melt runs confirmed that high-frequency sinusoidal pulsing resulted in deeper welds than those at average steady current levels. Melt runs were made using sinusoidal pulsing with < I > = 150 A, an amplitude of 120 A, and varying frequencies. The melts made at 3000 Hz showed an increase of 20% in depth compared to melts made at the average steady current of 150 A, with no increase in top width. These results show that high-frequency current pulsing changed the weld pool geometry by deepening the pool without changing the top width. Therefore, highfrequency current pulsing is an effective scheme for GTAW pool geometry control.