Description
In this paper, the restraint effects of pulse frequency and pulse duty cycle on the precipitates of harmful needle-like A1₄C₃ phase were studied in C0₂ impulsed laser welding through the experiment on the SiC_p/6063 composite, and the microstructures of the weld under the different process parameters (pulse time from lms to 20ms,duty cycle from 50% to 91%) were analyzed. In order to compare, C0₂ continuous laser was conducted under the same efficiency. The results demonstrated that the proper laser pulse frequency and duty cycle can restrain the formation of A1₄C₃, effectively. It was also noted that due to the stir action of laser pulse, the reinforcing phases in the weld are distributed more evenly than those in C0₂ continuos laser welding.