Abstract: In synchronism, electric and spectral information of droplet transfer in pulsed GMAW process is collected using picking system. The variation of spectral information is the greatest when the droplet transfer appears and it can reach 47.5% of the total intensity. All of the welding wires melting, necking down, droplet growing up and falling apart during droplet transfer of pulsed GMAW process can be found in spectral information. Further, Daubechies and symlets wavelet analysis shows：There is explicit characteristic of correspondence reflecting the droplet detachment in both the electric and spectral time domain and frequency domain detail information. At the same time, other some detail information of characteristic droplet transfer processing is also found.

Key words: Droplet transfer, Pulsed-MGAW, Spectral information, Wavelet transforms