A new laser welding process that uses a real time closed loop control system of the process by monitoring thermal emissions directly from the weld region. These emissions are captured, measured, interpolated, and thus correlated to a known temperature. The process has been applied on laser welding a test box molded from thermoplastic PBT material, Ultradur B4300G6.Robustness of the process and the quality of the weld joint is evaluated by performing burst testing of the welded boxes, after welding the box samples at various surface temperatures. The experiment has identified optimum surface temperature regime for laser welding a material for a given weld section design. Microscopy study shows microstructure of good weld joint and poor weld joints.
展开▼
