Evaluation of Magnetic Field Generation in MIG/MAG Welding in Conventional and Controlled Short Circuit Mode

Abstract:

MIG/MAG welding, widely used in different industry sectors, stands out for its high productivity. It uses high current levels capable of generating intense magnetic fields. In addition to this fact, the present study aims to investigate the relationship of other operational variables of the process with the generation of magnetic fields. To do so, the experimental planning involved the variation of voltage levels, feed velocity, metallic transfer mode and gas protection, according to the analyzed process. The magnetic field values ​​were collected at different distances from the electric arc, as a way of reproducing the regions of the welder's body judged by the international commission on protection against non-ionizing radiation (ICNIRP) as those that may pose some risk to the health of the worker. Thus, it was noticed that the higher values ​​of magnetic field are obtained for the higher levels of tension and feeding speed and the smaller the distance of the electric arc. Furthermore, a higher magnetic field generation is recorded in MIG/MAG welding in a short-circuit controlled mode. Finally, the values ​​obtained for the magnetic field strength, in coherence with the experimental parameters used, do not exceed the limit values ​​established by ICNIRP.

Key-words:
GMAW welding; Short circuit; Magnetic field