Effects of the Rotating Arc Technique on the GMA Welding Process

Abstract

Recent profusion of advanced GMAW process variants impairs understanding of the nature of each one, with the arc rotation technique among them. This paper's objective is investigating influences of wire-electrode rotation over metal transfer mode and melting rate. A bead on plate experimental matrix was performed and electrical signals acquired in synchronicity with high speed videography. Impacts of electrode rotation were observed on welding voltage and current, whereby rotation speed exerts marked influence. Droplet short-circuiting frequency was affected, culminating in free-flight transfer mode for higher rotation speeds. Increase of melting rate was observed for lower electrical power, indicating efficiency enhancement of the process. Moreover, arc rotation proved to expand controllability of the thermal development of the workpiece. Results are supported by videothermography.

The evaluation on performance of narrow- gap welding thick steel plates under the influence of main welding parameters

“…There were some publications investigating the influence of wire-electrode rotation speed, longitudinal magnetic field and the oscillating arc on the fusion of sidewalls for narrow groove weld [10−12]. For example, in [10], the authors focused on the effect of the rotation technique, which encourages a free flight metal transfer mode at lower welding current than the original transition current. Finally the wire-electrode rotation interferes in the melting efficiency of the wire.…”

Applying Statistical Models to Optimize the Weld Bead Geometry in the Vertical Oscillation Arc Narrow Gap All-Position GMAW

“…Studies show that these defects generally originate from the lack of heat input control and the formation of the poor upper weld bead. Aiming at resolving this problem, numerous investigations have been carried out to improve the quality of narrow gap welding, and different methods, such as angular swing arc [8][9][10], rotating arc [1,11,12], tandem GMAW [13][14][15], laser welding [16][17][18], hybrid laser-arc welding [19][20][21], and cable-type wire welding [6,22,23] have been developed. Although these methods have remarkable achievements, they have high requirements for welding equipment in welding long-distance pipelines in the field environment, which limits the development of automatic welding for pipelines in the field.…”