ABSTRACT
This study is within the context of searching for innovations in processes and increased productivity, especially in the TIG welding process. Two new welding process technologies will be investigated, the Multi-Cathode TIG (TIG-MC) with three electrodes, with wire feeding and simultaneous actuation between three TIG electrodes and the hybrid TIG-MIG MC process, with a MIG/MAG wire between the TIG electrodes. Previous research has allowed the creation of basic technology for the application of TIG MC with two electrodes (TIG DE - Double Electrode), and to conclude a potential increase in productivity and weld quality, by better controllability of arc geometry and pressure exerted on the weld pool. The main object is the basic characterization (new process-specific parameters and interaction between the arcs). Related to this object, it is then intended to establish a mapping of parameterization ranges and formulation of welding procedures dedicated to prospective applications. The effects of the combined arc of three tungsten electrodes acting simultaneously on the same welding torch with and without an arc on the central wire, varying the possible distances and angulations of electrode placement, and the wire parameters, will be characterized by means of various monitoring and evaluation technologies. Preliminary results have already proven the torch's adequate functionality, and it is possible to apply this technology with a total of four simultaneous arcs. Depending on the distance between electrodes, it is possible to obtain the formation of a single arc with morphological characteristics very similar to the conventional TIG process, but with the ability to act with three times the current value in the same process. Another relevant aspect was the proper operation of the MIG/MAG process in spray mode, simultaneously with the three TIG electrodes already at this early stage of the work. This shows the potential of this technology to obtain a welding process where deposition rates can be significantly increased compared to TIG and MIG/MAG processes operating separately. In addition, it has also been possible to identify, measure and document the flow of electric current between electrodes.
Keywords: Multicathode; Hybrid welding; TIG-MIG; Coupled Arc
Reference
ROSA, A. F.; CAMPOS, T. B.; BATISTA, F.; SCHWEDERSKY, M. B.; SILVA; R. H. G.. Technological Insights into the TIG MultiCathode Welding. In: Proceedings of the 12th Brazilian Congress of Manufacturing Engineering. Brasilia, DF, Brazil, May 10th-12th, 2023.