Description

Cars consume a lot of energy to move their own weight. By reducing the thickness of the plates used to build car bodies, without losing ductility, strength and energy absorption after impact, the weight of the vehicle is reduced and, consequently, its energy efficiency is increased. However, one of the biggest problems faced when forming sheet metal to obtain a suitable geometry is the springback effect. In this work, the influence of laser welding parameters on the springback of DP600 two-phase steel sheets was studied, varying parameters such as: the punching speed in the bending test, the initial bending internal angle, and the observation of the springback variation with time. Tensile tests, Vickers hardness and optical microscopy analysis were carried out to correlate the results with the mechanical properties of the material. Laser welding was used to join DP600 steel plates with the weld bead being in the position where the bending occurs. Controlling the springback value ensures better quality in vehicle manufacturing. It is concluded that, by increasing the punch lowering speed, the springback values were increased. However, by increasing the initial internal bend angle from 30 to 90 degrees, the springback values were decreased. It was also verified that by increasing the observation time, the springback variation continued to increase 5 days after the bending test, until stabilization.

Contributing Authors

  • Christyane Almeida
    State University of São Paulo
  • Marcelo Pereira
    State University of São Paulo
  • Odair Santos
    State University of São Paulo
  • Milton Pereira
    Federal University of Santa Catarina
  • Renato Panziera
    Federal University of Santa Catarina
  • Manoel Kolling Dutra
    Federal University of Santa Catarina
Milton Pereira
Federal University of Santa Catarina
Track: Laser Materials Macroprocessing
Session: Poster Gallery
Day of Week: Tuesday
Date/Time:
Location: Exhibit Hall

Keywords

  • High Strength Steel-Dp600
  • Laser Welding
  • Springback Effect
  • Tailored Welded Blanks