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目的:运用光纤激光焊接技术,探索一组较优参数对断裂的纯钛可摘局部义齿支架进行激光焊接修复。方法:在制备的试件上,使用YLS-3000光纤激光器(最大功率为3 000 W)和KUKA机器人作为铸件加工的执行机构,采用手工编程或自动编程方式及轮廓控制方式进行精确的轨迹插补运动,调整激光功率、扫描速度、扫描次数,通过金相组织分析及组织纤维洛氏硬度分析得到较优工艺参数。基于此参数对断裂的纯钛义齿支架进行激光焊接修复。结果:成功完成了关于纯钛可摘局部义齿支架光纤激光焊接关键技术的研究,并获得符合临床要求的纯钛义齿支架。结论:在利用光纤激光器焊接修复断裂的铸造纯钛可摘局部义齿过程中,探索合适的工艺参数对焊接区形成良好的冶金结合和提高铸件的机械性能至关重要。
OBJECTIVE: To explore a set of optimal parameters for repairing laser welded joints of split pure titanium removable partial dentures using fiber laser welding technology. Methods: Using the YLS-3000 fiber laser (maximum power of 3 000 W) and KUKA robot as the actuator of casting process on the prepared test piece, the precise path interpolation was performed by hand programming or automatic programming and contour control Motion, adjusting laser power, scanning speed and scanning times. The optimal technological parameters were obtained through the analysis of microstructure and the Rockwell hardness of the fiber. Based on this parameter, the repaired pure titanium dental prosthesis was repaired by laser welding. Results: The successful completion of the key technologies of pure titanium removable partial denture stent fiber laser welding, and to meet the clinical requirements of the titanium denture stent. CONCLUSIONS: In the process of repairing a split pure cast titanium partial denture using a fiber laser, it is of crucial importance to explore suitable process parameters for forming a good metallurgical bond in the weld zone and improving the mechanical properties of the cast part.