CO2焊短路过渡过程瞬时能量的波形分析

采用自行研制的焊接电弧动态小波分析仪,对三台弧焊接电源的焊接过程进行了测试分析.试验结果表明,瞬时能量可以综合地反映电流电压对电弧动态性能的影响.起弧时瞬时能量应随电流的上升而迅速达到引弧能量,从而使引弧顺利.在中间焊接过程的熔滴过渡周期中,燃弧的瞬时能量应稳定在基值,短路过渡时陡降至更小值,然后迅速上升完成短路过渡;电弧重燃后瞬时能量再快速地降到基值.收弧时瞬时能量应缓降到零,并且避免严重冲击.分析结果可为焊接电流、电压波形的设计和精细控制提供依据.

Instantaneous energy waveform of short circuiting transition in CO2 arc welding

The welding process of three arc welding machines had been tested and analyzed with the welding dynamic arc wavelet analyzer developed by the anthers. The experimental results indicate that the instantaneous energy can synthetically reflect the influence of current and voltage on dynamic arc characteristics. To make are ignite successfully, the instantaneous energy should increase to enough high quickly along with the current. In a cycle of short circuting transition during the steady welding process, the instantaneous energy during arc burning should be kept at the constant base, and then it falls to smaller value rapidly, finally, it rises rapidly and completes the short circuit transition. The instantaneous energy falls again rapidly to base after arc re-striking. While arc extinguishing, the instantaneous energy falls slowly to zero and avoids serious impulsion. The experiment results can provide for the foundation to design and control accurately the waveform of the welding current and voltage.