共查询到20条相似文献,搜索用时 125 毫秒
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从降低能耗、减少环境污染以及节约有限资源的社会需求出发,阐述了汽车涡轮增压器技术在汽车工业发展中的迫切需求及巨大的市场潜力,指出了涡轮增压器涡壳在铸造生产过程中所面临的技术难题与挑战. 相似文献
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阿普拉斯(Arplas)焊接技术是实现汽车钣金件焊接时,减小焊接变形量和焊点压痕的一种新型焊接技术。介绍了阿普拉斯焊接的关键工艺、技术特点及其质量控制系统。讨论了阿普拉斯焊接技术解决传统焊接方式带来的质量问题的系统方案,总结了阿普拉斯焊接技术在汽车工业中的应用,为其在汽车领域焊接技术的深入研究和应用提供参考。 相似文献
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激光-电弧复合焊接在汽车制造中的应用 总被引:6,自引:2,他引:4
阐述了激光—电孤复合焊耧提出背景以厦其机理,介绍了国内外激光—电孤复合焊接在汽车车身制造中的应用现状,证明激光—电弧复合焊接作为一种新型焊接技术在汽车行业中将会得到越来趄广泛的应用。 相似文献
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分析了1 000 MW超超临界汽轮发电机定子机座的结构,该汽发定子机座尺寸大、制造难度高。为了满足制造技术要求,提出以汽端和励端分别为基准,机座分两段进行装配焊接,然后再将两段总装的焊接装配方案。有效地控制了装配尺寸,防止焊接变形,确保机座装配质量满足设计要求。 相似文献
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介绍了中频电阻焊接的基本原理,并指出与目前传统的交流电阻焊接相比,它在焊接中具有控制精度高、节能、焊接质量好等许多优势.重点介绍了中频电阻焊接在我国汽车工业中的应用和明显的优势,最后指出中频焊接技术将会成为电阻焊接的趋势. 相似文献
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蒸汽轮机自带冠静叶隔板是蒸汽轮机通流部分的静子部件 ,其制造精度直接影响到整个机组的效率。在实际生产中发现自带冠叶隔板焊后节圆直径变形大 ,严重影响了隔板通流尺寸精度。文中针对蒸汽轮机自带冠叶隔板生产过程中产生的焊接变形问题 ,采用定点测试方法 ,进行现场跟踪监测 ,获得了有效的焊接变形数据。并对自带冠叶隔板主焊缝焊接后和热处理后的节圆半径变形、直径变形和节圆收缩率进行了深入分析。为了减小焊接变形 ,在隔板的结构设计方面应控制主焊缝进汽侧与出汽侧的坡口深度比值在 1.0~ 1.15范围内 相似文献
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汽轮机叶片围带焊接后进行磁粉探伤时出现伪磁痕,造成焊接区存在裂纹的假象和误判。本文用成分—金相组织—物理性能方法进行综合分析,找到了误判的原因。指出汽轮机叶片围带焊后检测焊缝时避免焊接裂纹误判的正确探伤方法。 相似文献
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Summary Pore formation is an important concern in laser welding of automotive aluminium alloys. This paper investigates the influence of laser beam defocus on pore formation during continuous wave Nd:YAG laser welding of 5182 and 5754 automotive aluminium alloys. It was found that the instability of the keyhole during welding was a dominant cause of pore formation while hydrogen rejection played an insignificant role. The defocusing of the laser beam greatly affected the stability of the keyhole. Finally, the mechanism of keyhole collapse and pore formation is proposed. 相似文献
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The automotive industry envisions that an optimized vehicle in terms of performance and cost can be achieved only by using different materials at different vehicle locations in order to utilize the functionality of the different materials to a full extent. Currently, steel and aluminum are the most important construction materials for the mass production of automotive structure. However, other materials such as magnesium alloys and stainless steel are also used. The use of dissymmetric assemblies of materials in the automotive industry has also led to the development of joining technologies other than spot welding and arc welding such as clinching, adhesive bonding, laser welding, and MIG brazing. However, and despite the development of these new joining technologies, there are still important gaps of knowledge with regards to the corrosion performance of different joint populations using dissymmetric and symmetric materials. Materials commonly used in the automotive industry including steel and aluminum‐based susbtrates were assembled with different combinations using various joining techniques in order to evaluate their corrosion performance as well their mechanical properties after cyclic accelerated corrosion tests. The results indicated a relationship between the corrosion inside the confined joint and the decrease of the mechanical properties of the assemblies. 相似文献