Publications

Abstract : The aim of this study was to investigate the melting rate of GTD-111 Nickel-based superalloy sheet in Nd:YAG pulsed-laser welding. For this purpose, different parameters such as pulse frequency, pulse duration, pulse energy, and welding speed were used. To obtain the melting rate under Nd:YAG pulsed conditions, mathematical formulas were used in which the preheating effects of each pulse by the previous pulse were considered. The results showed that keyhole formation plays the most important role in the sudden increase in melting rate. In addition, it was found that pulse energy is the most effective welding parameter for keyhole formation compared to other parameters. The effect of welding speed and pulse frequency was also investigated separately and a suitable range was introduced to maximize the melting rate in the keyhole mode.