激光钎焊论文.doc

学 士 学 位 毕 业 论 文 激光钎焊在车身焊装运用中的缺陷分析及解决方案 Analysis and solution about defect of laser brazing technology in application of automobile body welding 学生姓名： 学　　号： 专　　业： 材料成型及控制工程 所在学院： 材料科学与工程学院 指导教师： 2011年06月08日 摘 要 作为车身焊接工艺的核心部分，激光钎焊技术在国内的应用日益普遍。某某汽车有限公司对许多车型的车顶、后盖、落水槽等部位采用了该技术。 然而该技术在实际焊装运用中常产生诸如气孔、夹杂、未焊接、焊缝稀薄等等缺陷问题，这给公司的生产秩序造成了影响，同时也限制了该项技术更加广泛的应用。事实证明，运用良好的激光钎焊技术，不但能提高车身强度和美观性，还能有效降低工作量和提高工作效率。本文致力于系统地分析与解决激光钎焊在车身焊装运用中产生的各种缺陷与不足。 激光钎焊焊缝缺陷可以分为两大类，一类是设备精度和工艺参数造成的缺陷，一般称作工艺缺陷；另一类是生产过程中人员的偶然因素造成的缺陷，一般称作人为缺陷。本文从激光钎焊系统和设备入手，分析了各种设备参数因素对焊接性造成的影响，得出了工艺缺陷的产生原因，并相应地提出了解决方案。针对人为因素造成的缺陷，本文也结合生产状况提出了避免的建议。 本文采用如下思路进行研究：通过关于强度或晶相的实验分析，初步选择解决方案，通过反复生产实际的验证，得出的最终工艺办法。在各种缺陷的分析过程中，本文归纳总结了一些引起主要缺陷产生的源头因素，作为本文的创新部分，为本课题更加深入的研究提供思路。 关键词：激光钎焊 镀锌钢板 车身焊接 Abstract As a core part of the body welding,the application of laser brazing technology in China is increasingly common. Shanghai Volkswagen Automobile Co., Ltd. uses the technology at the roof, the back cover off and the tank and other parts of the automobile for many models.  However, the use of the technology in actual welding often bring defects such as porosity, inclusions, no welding, and so that the company has an impact on the production order, but also the application of the technology more widely is limited. Facts have proved that the use of laser brazing technology properly , can not only improve body strength and beauty, but also reduce workload and improve work efficiency. This paper is committed to take analysis and find solution for a variety of defects and shortcomings of laser brazing .  Laser welding-brazing defects can be divided into two main categories, defects caused by precision equipment and process parameters is commonly known as process defects; the other is the accidental factors defects caused by production process workers, commonly known as man-made defects. this paper analyzes the parameters of various factors on the welding equipment and the impact of process defe