Abstract
In this study, the impact characteristics of laser welded steel sheets are investigated and the change in toughness discussed. Instrumented Charpy impact test was carried out. In the range from -100℃ to 200℃, the welded steel sheets show good toughness. With decreasing the testing temperature, the maximum in load increase and the maximum deflection decrease. The fracture of welded steel sheets is mainly occurred at not weld metal as hard phase but base metal as soft phase. Therefore, the impact properties of weld steel sheets are similar to those of base steel sheets.
