Abstract
A limiting factor for the shielded metal arc welding (SMAW) mechanization is the interruption of welding operation for electrode replacement. However, even with an efficient mechanized system, due to electrode heating, the melting rate can change, changing the arc length and contributing to the heterogeneity of the mechanical and metallurgical properties along the weld bead. As a result, a weld bead of poor quality may be obtained. In this work, a method to control the electrode melting rate, based on electrode temperature and welding current monitoring was developed. In the method, which started with experiments with commercial E7018 electrodes welded using three different currents, a mathematical model relating melting rate with electrode temperature and current was developed. The model was simulated in MATLAB environment for a virtual mechanized system, in which the electrode holder moved vertically with a velocity equal to the melting rate and assuring a constant arc length.
Published Version
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