【摘要】 为了实现脉冲MIG焊熔滴过渡的稳定可控,设计了前中值波形控制工艺方法。在两脉冲峰值之间增加中值电流,提高了熔滴过渡的可控性。采用自行研制的焊接电弧动态小波分析仪对前中值电流波形控制的焊接过程进行了分析和评定,工艺试验表明,前中值电流太小时有短路断弧等现象,前中值电流太大则类似于无中值波形;前中值时间太短时中值阶段效果不明显,前中值时间太长时焊接过程不稳定。调节适当的中值电流和中值时间,可实现熔滴过渡的可控性,经试验得到脉冲电流和脉冲时间的最佳匹配参数。更多还原

【Abstract】 In order to control stable droplet transfer in pulsed metal inert-gas welding,the forward median waveform control method was proposed,which adding median current between the two peaks of pulse current.And the welding process was tested and analyzed with independently self-developed welding arc dynamic wavelet analyzer.The result showed that instantaneous short circuit occurrs if the forward median current was too small.Contrarily,if it is too large,forward median waveforms will be hardly observed.The result also indicated that the median phase effect will not be obvious if the forward median time is too short,but the welding process will not be stable if it is too long.Controllability of droplet transfer can be realized by proper median current and median time.And the optimal matching parameters for pulse current and pulse time were given under this experiment conditions.更多还原