| Prediction of weld penetration for high power laser beam welding with hot rolled steel plates was carried out based on real test results. Low and high carbon bearing steels with the C_(CQ) range of 0.34-0.87 and tensile strength range of 450 MPa-1,020 MPa were used for base plates. Several important welding parameters i.e laser output power, travel speed, position of focus and shield gas flow rate were taken into consideration. With metallograpic technique, weld penetration was measured for the bead-on-plate weld on the l0mm thick test materials. It was clear that analytical approach with various material constants showed poor reliability because the conventional method was originally based on the arc processes, where some specific phenomena such as energy reflection on the solid surface, key holing and laser induced plasma formation were neglected. Statistical process, on the other hand, agreed well with the test results. The prediction equation derived in this study was considered to be able to utilize as a system software or design parameter. |
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