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Influence of current levels, the tilt angle of the torch and the distance between the torch and the part on the geometry of the weld bead using ‘Plasma-MIG’ with concentric arcs

2017; Taylor & Francis; Volume: 31; Issue: 10 Linguagem: Inglês

10.1080/09507116.2016.1218628

1754-2138

André Alves de Resende, Américo Scotti,

Advanced Machining and Optimization Techniques

In order to produce welds that comply with the geometric specifications of a project, it is vital to properly control the weld pool. The 'Plasma-MIG' process using concentric arcs has been posited as an innovative alternative in this regard. Therefore, the aim of this study was to expand on the research related to the effect of current swings between the consumable electrode and the outer arc, the tilt angle of the torch and the distance between the torch and the part on the performance of the process. Welds that are simply deposited on a sheet plate were carried out in a flat position, with the aim of individually identifying the effect of each variable on the geometry of the bead. The current at the outer arc was assessed at four levels and the effects of the other parameters were assessed at three levels. It was found that increases in the current of the outer arc leads to more width, more penetration, a larger fusion zone and decreased strength. Increasing the distance between the torch and the part increases strength, whereas width, penetration and the fusion zone decrease. As for the angle of attack of the torch, the width and fusion zone increased and the strength and penetration decreased when we used the pulling method instead of the pushing method.