Estudo da qualidade de soldagem em uniões de perfil laminado pelo processo FCAW

Abstract

The search for improvement in the production processes of companies is a constant, as it is through them that profits are generated for its shareholders. In the metallic structures sector, attention should be even greater, due to the dynamics of the fabricated geometries. Therefore, knowing the processes, the techniques and parameters that can be applied improve the final quality of the product, thus how they increase the life of the metallic structure. Thus, this work aims to investigate the relationship between welding parameters and quality for laminated profile joints. For the study, the W200x22.5 profile was used as a specimen, where the voltage and current parameters that were used in the splicing process. By using an experimental design methodology, the number of specimens was defined, the factors and entry levels for conducting the study. After welding, the specimens were subjected to visual tests and non-destructible tests of penetrating liquid and ultrasound, which made it possible to find the discontinuities present superficially and internally to the welding site. Through analysis of variance and main effects, it was it is possible to verify that, when using low levels (voltage 13 V and current 90 A) and high (voltage 28 V and current 260 A) of voltage and current, the number of faults increased. For another side, at medium levels (voltage 20.5 V and current 175 A) there was a decrease in the total number of defects. With this, the experiments helped to verify the quality behavior in the welding process in laminated profile seams, by evaluating the number of defects and the presence of each defect occurring at different voltage and current levels. The evaluation showed that the welding quality was better at medium levels (voltage 20.5 V and current 175 A) being that for the low and high voltage and current levels, there was a drop in the quality of welding.