点焊技术在不锈钢轨道客车生产中的应用

不锈钢点焊技术作为材料电阻熔化焊的一种形式,由于能够保证焊接面的平滑性,且具有焊接工艺简单、无需保护气体、对环境影响较小等优点,近年来在铁路不锈钢客车生产中被大量应用。阐述了不锈钢点焊技术的主要技术指标,单面双点交流变频控制的应用优势,以及在城市轨道客车生产中所采用的工艺方法。     

地铁车辆基地上盖预留开发盖板防排水关键性技术研究

分析了预留盖板对地铁车辆基地及盖上物业开发的影响,以及盖板的不同使用阶段、不同功能定位对盖板的设计要求。利用分析法得出预留盖板在不同开发时期关键节点的特点。总结了设计过程中适于预留盖板,同时能够兼顾不同使用阶段的防排水优选方案。     

Path Planning of Planar Kinked Line Seam by Visual Servoing for Robotic Welding

Welding path planning can substitute for the manual teaching process of the robot and can promote the autonomous level of the robotic welding. A path planning method by visual servoing was presented, in which the optimal angle of charge-coupled device (CCD) camera was also planned. Aiming at planning two forms of kinked line seams, obtuse angle seam and right angle seam, a practicable solution was put forward. In this solution, the intersection of two adjacent straight segments is detected in each local seam image, and if intersection is found, the seam errors are calculated using the next straight segment. The experimental results show that kinked line seam can be well planned using this solution.     

A Generalized Rough Set Modeling Method for Welding Process

Modeling is essential, significant and difficult for the quality and shaping control of arc welding process. A generalized rough set based modeling method was brought forward and a dynamic predictive model for pulsed gas tungsten arc welding (GTAW) was obtained by this modeling method. The results show that this modeling method can well acquire knowledge in welding and satisfy the real life application. In addition, the results of comparison between classic rough set model and back-propagation neural network model respectively are also satisfying.     

Prediction of Welding Deformation of Underframe

IntroductionWelding deformation is a common and impor-tant problem in industry.In the last decades re-searchers have made efforts to predict and controlwelding deformation.There are usually three waysto determine the welding deformation:1 experi-ential formulas.2 Thermal elastic- plastic FEMmethod.3 Inherent strain method based onFEM[1～ 3 ] .Experiential formulas are only fit for simpleshape structures.Current thermal elastic- plasticmethod usually simulated either small or simplestructur…     

K190пк钢轨焊机新型程控调压系统的研究

针对Ｋ１９０пк钢轨焊机电源系统所存在的问题，采用大功率晶闸管和可编程序控制器配置Ａ／Ｄ模块和触发控制电路，研制了一种新型实用、性能可靠的程控调压系统，实现了焊接电压无触点控制和无级调节。该系统具有调压范围宽、精度高、抗干扰性强、网压自动补偿及成本低廉等特点。经现场试用，效果良好。     

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在广州市智能交通系统的逐步发展和完善过程中，由政府主导建立起智能交通系统的配套保障体系，使政府、企业、科研机构在研发智能交通系统过程中各司其职、各尽其能，是实现智能交通系统不可或缺的重要前提条件.本文针对广州市目前智能交通系统的发展现状，提出了完善其配套保障体系的几项建议，该建议将为广州市“十一五”智能交通系统的发展提供了更完备的体制环境，也为我国其它大城市智能交通系统的保障体系建设提供了较全面的参考范例.     

焊接专家系统综述

本文综述了专家系统在焊接领域的发展及现状、指出了专家系统目前存在的难点和发展方向。     

履带板加热器消除焊接残余应力的试验研究

测试了履带板加热过程中温度沿钢板厚度方向的分布，并用小孔释放法测试了补焊试板在焊态、经履带板加热以及炉内加热后残余应力的分布．结果表明，履带板加热时所需加热时间较长，但温度沿试板厚度方向梯度小，截面温度分布均匀；履带板加热器消除焊接残余应力效果与炉内加热相当．     

沥青路面的裂缝及预防

沥青路面裂缝问题是公路工程质量通病之一。从裂缝产生的原因入手,对沥青路面层间应力进行了较详细的分析,并有针对性地提出了预防裂缝出现的相应措施。