激光功率对Nd:YAG激光焊接钛管材料的显微组织和力学性能的影响  

Effect of laser power on microstructure and mechanical properties of Nd:YAG laser welding of titanium tubes

作　　者：R.PALANIVEL 

机构地区：[1]Department of Mechanical Engineering,College of Engineering,Shaqra University,Dawadmi,Riyadh 11911,Saudi Arabia

出　　处：《Journal of Central South University》2023年第4期1064-1074,共11页中南大学学报（英文版）

摘　　要：采用Nd:YAG激光束焊接连接2级钛管。通过组织表征和力学试验研究了激光功率的影响。结果表明,随着激光功率的增加,焊珠的几何形状从楔形变成了平行形,焊接区呈粗糙、不均匀、锯齿状的粗颗粒结构。激光功率对晶粒的位向角分布也有显著影响。高功率激光导致焊接区出现了较大的孔隙,还有高密度的位错和亚晶界。通过激光焊接,材料的强度得到提高,但通过显微硬度分析发现,高功率激光下材料的强度提高较小,而在较低功率的激光下,材料可以获得更高的抗拉强度。通过断口分析发现,焊接区存在的微小空隙导致材料出现韧性断裂。In this work,Nd:YAG laser beam welding was applied to join the grade 2 titanium tubes.Metallurgical characterization and mechanical tests were carried out to study the effect of laser power.The findings showed that when power increased,the bead geometry shape changed from wedge to parallel.The weld zone displayed a rough,uneven,and serrated coarse granular texture.The laser power had a significant impact on the misorientation angle patterns.High laser power revealed large pores.In the weld zone,dislocation pattern with high density and more sub grain boundaries were seen.The weld zone was strengthened during laser welding and less strengthening was observed at higher laser power in microhardness analysis.Higher tensile strength was achieved at lower laser power.The ductile failure was observed due to fine voids in the fracture surface analysis.

关 键 词：激光束焊接 钛管接头 显微结构 硬度 抗拉强度 

分 类 号：TG456.7[金属学及工艺—焊接]