BTi6431S钛合金光纤激光焊接成形及稳定性分析

Weld Formation and StabilityAnalysis of Fiber Laser Beam Welded BTi6431S Titanium Alloy

对3.0 mm厚BTi6431S高温钛合金进行光纤激光焊接,从焊缝成形、气孔和金属蒸气/等离子体特征等方面研究了焊接工艺参数对焊缝成形质量及焊接过程稳定性的影响。结果表明,激光功率对焊缝熔宽、余高、咬边和气孔率均有影响;焊接速度主要影响焊缝熔宽和背宽比。焊接工艺对焊缝成形质量的影响与金属蒸气/等离子体特征与稳定性密切相关。较低激光功率(1.5~2.5 kW)或较高焊接速度(3.5~4.5 m/min)下,金属蒸气/等离子体面积及面积波动均较大,焊缝未熔透且气孔率高;中等激光功率(3.0~3.5 kW)和焊接速度匹配(2.5 m/min)下,金属蒸气/等离子体面积及周期波动均较小,焊缝全熔透,成形质量好。

3.0 mm thick BTi6431S high temperature titanium alloy was welded by fiber laser beam welding.The effect of welding parameters on welding quality and stability was studied from the aspects of weld formation,porosity,and characteristics of metal vapor/plasma.The results indicate that the laser power has an effect on the weld width,residual height,underfill,and porosity.The welding speed mainly affects the weld width and weld width ratio.The effect of welding process on weld quality is closely related to the characteristics,and stability of metal vapor/plasma.At lower laser power(1.5-2.5 kW)or higher welding speed(3.5-4.5 m/min),the metal vapor/plasma area is large and area fluctuation is obvious,the weld is not penetrated,and the porosity is high.Under moderate laser power(3.0-3.5 kW),and welding speed matching(2.5 m/min),the area and periodic fluctuation of metal vapor/plasma are small,the weld is fully penetrated,and the forming quality is good.