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 laye...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.展开更多
文摘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.
