ULUSLARARASI 10. OTOMOTİV TEKNOLOJİLERİ KONGRESİ, Bursa, Turkey, 6 - 07 September 2021, pp.762-768
Laser welding is an advanced technology welding method based on the principle of melting the materials using a laser beam. In this study, overlap laser welding was implemented to DP1200 steels with a thickness of 1.2 mm. For effective process parameters were determined as 5 levels: laser power (2200 W - 2350 W - 2500 W - 2650 W - 2800 W), scanning speed (40 mm/s - 47.5 mm/s - 55 mm/s - 62.5 mm/s - 70 mm/s) and laser angle (70ᵒ - 75ᵒ - 80ᵒ - 85ᵒ - 90ᵒ). Central Composite Design experimental design was used these process parameters. The effect of laser power, scanning speed, and laser angle on the maximum shear force after the tensile test was analyzed by the Response Surface Method. The mathematical equation was created and process parameters were optimized: results were laser power 2800 W, scanning speed 40 mm / s, laser angle 70ᵒ. A stronger welding and high shear force have been obtained with the increase of laser power, decrease of scanning speed, and decrease of laser angle parameters due to high energy input.