Statistical modeling of laser welding of DP/TRIP steel sheets

In this research work, a statistical analysis of the CO2 laser beam welding of dual phase (DP600)/transformation induced plasticity (TRIP700) steel sheets was done using response surface methodology. The analysis considered the effect of laser power (2–2.2 kW), welding speed (40–50 mm/s) and focus position (−1 to 0 mm) on the heat input, the weld bead geometry, uniaxial tensile strength, formability limited dome height and welding operation cost. The experimental design was based on Box–Behnken design using linear and quadratic polynomial equations for predicting the mathematical models. The results indicate that the proposed models predict the responses adequately within the limits of welding parameters being used and the welding speed is the most significant parameter during the welding process.

► This paper deals with the statistical evaluation of the laser welding of new automotive steels. ► The mathematical models developed can adequately predict the responses within the factors domain. ► The welding speed is the most significant parameter during CO2 LBW of DP/TRIP steel sheets. ► The developed models could be used for mass production for computerized welding process.