史平安,万强,庞盛永,陈鑫,莫仲海

• 1:中国工程物理研究院总体工程研究所
• 2:华中科技大学材料科学与工程学院
• 3:中国工程物理研究院机械制造工艺研究所

摘要(Abstract)：

为了准确地模拟出激光深熔焊接中小孔的动态变化过程,根据小孔内激光能量的传输过程和吸收机制,采用光线追踪法来描述小孔对激光能量的多重反射吸收作用,建立了基于光线追踪的热源模型,分析了工艺因素对30Cr Mn Si A钢激光深熔焊接过程中瞬态小孔的深度振荡和熔池流动行为的影响。结果表明,激光焊接过程中熔池的小孔深度呈周期性变化并伴有高频振荡特征,而小孔的振荡是焊接不稳定性和缺陷形成的重要原因。而随着激光功率的增大,小孔深度增大,小孔深度达到相对稳定状态的时间缩短。小孔深度达到相对稳定状态时,小孔振荡的幅度随激光功率的增加而增大。在对不同工艺条件下熔池的温度场、流场和小孔的动态演化过程对比的基础上,进一步探索了焊缝气孔的形成机理,并提出了减少焊缝气孔和增强小孔稳定性的新思路。

关键词(KeyWords)： 激光深熔焊;气孔;形成机理;数值模拟

Abstract:

Keywords:

基金项目(Foundation): 中国工程物理研究院重大基金资助项目(2013A0203008);中国工程物理研究院重点学科项目“计算固体力学”资助

作者(Author): 史平安,万强,庞盛永,陈鑫,莫仲海

DOI: 10.13289/j.issn.1009-6264.2016.04.038

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