Estudio del comportamiento de las juntas soldadas utilizando acero HSLA con el proceso Gas Metal Arc Welding (GMAW) en la fabricación de vehículos de transporte de pasajeros

Abstract

The present work has as objective to study the behavior of welded joints using HSLA steel with the Process Gas Metal Arc Welding (GMAW) in the manufacture of passenger vehicles considering the variables that influence the process that are: opening of root, progression of welding, voltage, amperage, forward speed and shielding gas. In order to check the acquisition of base metal, chemical analysis was performed by atomic emission spectrometry spark to compare their chemical composition and by means of the tensile test to check its mechanical properties. In welded joints was the testing of visual inspection, non-destructive testing, traction on the section reduced, bent of face and root. With the results obtained Welding Procedure Specifications (WPS) qualified with the optimum parameters to assure the quality of the bead with basis of the code AWS D1.1. As an additional analysis, metallographic testing was performed to know the microstructural variation in the weld bead. To know the value of the area of the zone affected by the heat, the macrography test was required. While with the testing of hardness in the scale Rockwell B, it was known that zone has higher values.