【摘要】 目的:研究激光功率对纯钛焊件机械性能的影响,为临床应用激光焊钛提供参考。方法:采用3种不同的激光功率对纯钛进行焊接,通过测定焊件的机械强度,并进行断口扫描电镜观察和熔合区金相分析,研究激光功率与焊件强度的关系。结果:纯钛1.4kW组焊件未焊透,1.6kW和1.8kW组焊件在最大抗拉、抗弯强度上无显著差异;微观分析显示焊接接头有裂纹和气孔,以气孔为主,并且随着功率的升高,裂纹和气孔有加重的趋势。结论:激光焊接纯钛时,不能单纯以提高功率来增加熔深,避免采用过大的焊接功率。更多还原

【Abstract】 PURPOSE: To make an clinical implication for the use of laser welding pure titanium,this study investigate the effet of irradiation power on the mechanical properties of laser-welded joints. METHODS: The pure titanium tensile test and three-point bending test rods were laser-welded with different irradiation power. Then the tensile rods were tested for the ultimate tensile strength (UTS), and the bending rods for the ultimate bending strength (UBS). The tensile fracture surface was examined by scanning electron microscopy (SEM). Metallurgical analysis was also performed on polished longitudinal sectioned samples. RESULTS: A small portion of the central area in group 1.4kW was not joined. ANOVA showed no significant difference of OTS and VBS between group 1.6kW and group 1.8kW at the 0.05 level. SEM examination and metallurgical analysis showed that there were defects such as pores and cracks in the welding zone;and as the irradiation power increased ,there were more pores and cracks. CONCLUSION: The increase in laser irradiation power cannot increase melting depth significantly.更多还原