短路过渡CO_2焊接熔滴尺寸控制

Molten droplet size control in short-circuiting CO_2 arc welding

分析了短路过渡CO2焊接的熔滴形成过程及焊接电流波形对熔滴形状及短路过渡历程的影响规律,对采集获得的焊接过程中的焊接电流信号进行数学处理,采用最小二乘法建立了波形控制短路过渡焊接的焊丝熔化模型。在此基础上,通过控制燃弧初期脉冲电流的宽度调整燃弧能量的大小,对熔滴尺寸控制进行了试验研究。结果表明,随着燃弧脉冲电流宽度的增加,熔滴尺寸单调增加,这说明改变燃弧初期脉冲电流的宽度可以有效地控制燃弧能量和熔滴尺寸的大小。

The formation process of molten droplet in shortingcircuit CO2 arc welding and the influence of welding current on the molten droplet shape and short-circuiting transfer course were analyzed.After the welding current signals acquiring during the welding process being pretreated,an welding wire melting model for waveform controlled short-circuiting transfer welding was established by using the Least Square Method.Based on this model,an experimental research was carried out for the molten droplet size control by adjusting the width of welding pulse current in the initial phase of arc ignition to control the arc energy.The experimental results show that the molten droplet size increases monotonously as increasing the width of pulse current of arc ignition,which means that the arc energy and molten droplet size can be controlled effectively by changing the width of pulse current of arc ignition.