Crystallization behavior of Ti₃Al-Nb alloy laser beam welding joints

来源期刊：中国有色金属学报(英文版)2005年第z2期

论文作者：李俐群 陈彦宾 张春丽 雷正龙 徐广印

文章页码：16 - 20

Key words：Ti₃Al-Nb alloy； laser welding； crystallizing layer； crystallization behavior

Abstract: CO₂ laser beam welding experiment of Ti₃Al-Nb alloy was conducted by adopting overlay welding, the resulting special crystallization phenomenon of welding joint was analyzed. The joints have obvious crystallizing layer phenomenon with clear bond-like contours after laser welding. The results of X-spectrofluorimetry and energy spectrum analysis indicate that the non-uniform distribution of elements exists in crystallizing layer, because the temperature gradient is an important factor that impacts the alloy crystallization behavior. Furthermore, the effects of welding heat source, welding speed, pulse frequency and welding preheat on crystallizing layer distribution were investigated.