Uma investigação da influência dos parâmetros de pulso em soldagem com eletrodo tubular com proteção gasosa

Abstract

In this work, was introduced a study of the welding with gas-shielded flux arc welding process (FCAW), trying to find the appropriate conditions for the welding with FCAW, besides studying the influence of the pulse parameters on characteristics of the weld. In the first part of the work, the flux cored arc welding process (FCAW) and gas metal arc welding process (GMAW) were studied with the objective of they be compared. In the second part of work, other pulse conditions were investigated, concentrating the analyses on the flux cored arc welding process. To conclude, the hardness and the microstructures of samples produced with both studied processes were analyzed. As results, it was found that it is not possible to obtain better results with the flux cored arc welding process, in relation to gas metal arc welding process, when processed under the same conditions, because the process with tubular wire demands larger values of mean current and of wire feed rate. Besides, it was found that the answers studied in the flux cored arc welding process they are quite influenced by the mean current, pulse frequency and wire feed rate. In relation to the analysis of the microstructures, it was found that the microstructures formed in the weld bead produced with flux cored arc welding process and gas metal arc welding process, under the same conditions, they are different.