Efeito do pré-aquecimento na morfologia das fases precipitadas na zona fundida durante a soldagem do aço baixo-carbono

Abstract

The purpose of this work is to contribute to the study of the effect of preheating on the morphology of the precipitated phases in the molten zone during welding. of low carbon steel. Experiments, calculations and analysis of graphs were carried out at in order to show such an impact. The deposition process was performed from the use of the Inverse 450 power source in the automated Mag process, keeping all welding parameters, except the preheat temperature, and using a experimental welding bench that allowed the deposition of the weld bead on the automated condition. The plates were heated with a torch, each one until its pre-set preheating temperature, which temperature is controlled through of the pyrometer. An optical microscope was used to observe the microstru