Forward median waveform control process parameter in pulsed MIG welding

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.