The development of electronic power sources has allowed the study of innovative processes, generally with the objective of improving the capacity of production allied to low levels of heat input and, therefore, better controlling of the welding pool. The main approach of reaching such capacity is basing on the metal transfer adjustment and the development of forms of waves that improve the control of the process. Process VP-GMAW (variable polarity) is a derivative process of the conventional GMAW that joins the advantages of the use of positive polarity, as the good stability of arc and cathodic cleaning, with the supplied ones for the negative polarity, which leads to high melting rate and low heat input to the base metal. However, this process still possesses limited use due to scarce scientific literature on the subject, especially for mild steels. Therefore, in this work it is presented a proposal of a methodology for parameter determination in four different wave formats and varying the ratio of negative electrode in three levels. The chosen response was both the arc and metal transfer stability. The process evaluation was carried by high-speed filming of the arc and analysis of the geometric characteristics of the bead. The methodology led to good process stability and, therefore, showed feasible.