CAJ | 학술논문

受加工工艺、热变形等因素影响,超薄钛壳的密封焊接存在较大的困难。采用Nd：YAG脉冲激光器对0.3mm厚的钛壳进行激光密封焊接,详细研究了激光焊接过程中脉冲激光波形、激光功率、焊接速度、离焦量、侧吹气体流量等工艺参数对焊接成形质量的影响,随后对0.3mm厚的搭接接头进行了显微硬度测量与显微组织分析,最后采用氦质谱检漏对焊接样品进行了漏率测量。试验结果表明：平稳的焊接波形是获得优质密封焊接效果的良好选择;激光功率和焊接速度的合理匹配是保证焊接质量的必要条件;当采用侧吹气体流量为15L/min时,气体保护效果良好。通过一系列的工艺试验,总结出超薄钛壳的工艺焊接规程,为实际工程应用和优化密封焊接过程提供参考。
수가공공예、열변형등인소영향,초박태각적밀봉한접존재교대적곤난。채용Nd：YAG맥충격광기대0.3mm후적태각진행격광밀봉한접,상세연구료격광한접과정중맥충격광파형、격광공솔、한접속도、리초량、측취기체류량등공예삼수대한접성형질량적영향,수후대0.3mm후적탑접접두진행료현미경도측량여현미조직분석,최후채용양질보검루대한접양품진행료루솔측량。시험결과표명：평은적한접파형시획득우질밀봉한접효과적량호선택;격광공솔화한접속도적합리필배시보증한접질량적필요조건;당채용측취기체류량위15L/min시,기체보호효과량호。통과일계렬적공예시험,총결출초박태각적공예한접규정,위실제공정응용화우화밀봉한접과정제공삼고。
Due to the effects of manufacture techniques on specimen and heat distortion during welding,seal welding for ultra thin titanium shell is quite difficult.An Nd： YAG pulse laser system was used to seal 0.3mm thick medical titanium implant herein.The effects of process parameters including pulse wave shape,laser power,welding speed,defocusing amount,and shielding gas were investigated.Besides,tests of micro-hardness and micro-structure analyses on overlapped weld joint were discussed.Finally,parts of the welded specimens were analyzed by helium mass spectrum leakage detector.The experimental results show that flat wave shape is optimum choice for seal welding,reasonable collocation of laser power and welding speed guarantees the welding quality,and the weld bead color is good when the shielding gas flow rate is at 15 L/minute.The welding specification for sealing ultra thin titanium shell was confirmed through a serial of technique experiments.It provides reference for engineering applications and optimization of the seal welding further.