The influence of CO₂ and O₂ content on globular spray transition current when using argon-based blends in GMAW of ER 70S 6 wire

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.

Keywords:

• metal transfer
• transition current
• shielding gases

Acknowledgements

The authors would like to thank Air Products of Brazil, CNPq, Fapemig and Laprosolda/UFU for their support.

Notes

^1. [email protected]

^2. [email protected]

^3. [email protected]

Additional information

Notes on contributors

André Alves de Resende

1. 1. [email protected]

Flávio Keocheguerians

2. 2. [email protected]

Louriel Oliveira Vilarinho

3. 3. [email protected]