Abstract
The way in which the metal is transferred from the electrode tip to the weld pool affects the MIG/MAG process productivity and stability, as well as the weld bead geometrical characteristics. Among the modes of metal transfer, a very important parameter to know is the value of the globular spray transition current, which occurs in a narrow band of current and causes considerable changes in the frequency and diameter of the transferred drops and, therefore, the process stability. The transition current was investigated experimentally using a high-speed video camera associated with a new proposed methodology for identifying the transition current applied to binary and ternary mixtures of O2 and CO2 with an Ar base.
Acknowledgements
The authors would like to thank Air Products of Brazil, CNPq, Fapemig and Laprosolda/UFU for their support.