Avaliação do uso de vibração mecânica para alívio de tensões residuais na soldagem

Abstract

The residual tensions generated during the emotion process cause distortions that are the focus of industry attention. This problem is a direct cause of thermal cycling caused by an intense and localized heat source for melting the material, which causes unobserved expansions and contractions between the weld bead and the base material. Having knowledge of these effects caused by thermal cycles guarantees an advantage in its development and execution. Residual stresses on the surface and subsurface of mechanical components, during manufacture and in service, can affect performance and represent an important potential for their shape and dimension deviations. In this work, the evaluation of the use of mechanical vibration for residual stress relief in the transition of ASTM A131 EH36 steel plates is developed, using MIG/MAG with metallic spray transfer and the blind hole method (Hole-drilling) - MFC. From the strain values obtained, the residual stresses were continuous in the longitudinal and transverse directions for each distance from the center of the joint. From the strain values obtained, residual stresses were calculated in the longitudinal and transversal directions for each distance from the center of the joint. It was noted that for the frequency chosen for this study (63 Hz) there was an accentuated relief in the most distant position from the center of the welded joint in disagreement with the point closest to the center of the joint, which shows a high gradient between the three points measured.