国外超声波塑料焊机的使用与维修

国外超声波塑料焊机的使用与维修哈尔滨工业大学（１５０００６）田修波ＡｐｐｌｉｃａｔｉｏｎａｎｄＲｅｐａｉｒｉｎｅｏｆＵｌｔｒａｓｏｎｉｃＰｌａｓｔｉｃＷｅｌｄｅｒＡｂｒｏａｄＨａｒｂｉｎＩｎｓｔｉｔｕｔｅｏｆＴｅｃｈｎｏｌｏｇｙＴｉａｎＸｉｕｂｏ目前...     

交流弧焊机的使用与维修

在使用酸性焊条的场合，弧焊变压器（交流弧焊机）具有成本低、维修简单、使用寿命长等优点，因而在造船、机械、建筑等行业应用厂泛。现就目前常见的几种弧焊变压器的使用与维修做简单介绍。l弧焊变压器的分类弧焊变压器的种类和规格较多．其结构特点也各不相同，按其获得下降外特性的方式不同可分为：ZBX；系列动铁式弧焊变压器2．1结构特点（如图1所示）图1HXI－3。）0结构示意图动铁式弧焊变压器其绕组配置为全开式．即初级统组和次级统组完全分什．分别统在不同的芯柱上。初级上下两绕组串联后接入电源．次级上下两绕组并联后接人负…     

用户导向发展焊接行业

中国焊接行业经过近５年来的发展,已经逐步走出了低谷,出现了繁荣景象,这是令中国焊接界兴奋的事情。中国焊接界走出低谷是民营企业和合资企业发展的结果,是逆变技术在焊接产品中应用的结果,是中国用户接受先进技术、使用先进技术的结果,是新兴焊机制造厂和焊机用户双赢的结果,这一事实已经广为中国焊接界同仁所接受。但是,在这种大好形势下,仍有个别人找出一些理由,否定逆变焊机的发展趋势,这使我们不禁想到曾经有个洋人到处以专家学者的身份说逆变焊机不可靠,以消磨中国新兴焊机企业的斗志,让我们停止发展这项技术,为日后以…     

WE7307数显式单片缝焊机控制集成电路

WE73 0 7单片缝焊机控制芯片是WE系列单片电阻焊机控制芯片家族的又一新成员。本文对该芯片的特点及技术指标进行了简要分析与介绍 ,并对使用中的具体问题作了说明。     

进口CO2焊机维修的点滴经验

我厂购买了6台松下YM—500CL—3型CO2焊机。这种焊机性能优良，最突出的优点是没有控制电缆．使用时拉起电缆线来，差不多和手工焊一样方便．因而深受焊工欢迎。但是，我厂的6台焊机，使用1年多后，坏了5台。我们经过很大努力，相继修好了这S台焊机。现在，这6台焊机都在使用，运行正常。在维修过程中．我们发现：ZUEP07721q］＄1I板的电容CI（470／，100V）的耐压选低了一点，使焊机出现了较多的故障。C］所引起的故障，曾经仲我们大伤脑筋。故障现象是：焊机空载时，按手把开关，SA保险丝立刻熔断c检查后判断是7721板的问题。没有…     

WS—100直流钨极氩弧焊机的研制

介绍了所研制的用于焊接薄板的直流钨极氩弧焊机的电路及其工作原理，外特性的形成、电流的调节、引弧及调试中的几点体会。     

全国焊接精英技术演示会指定用焊机焊接工艺性能评定情况

今年5月25～28日在广东东莞举办的第十八届中国焊接博览会上，由大会组委会和全国职工焊接协会联合组织的“全国焊接精英技术演示会”在现场同期举行?来自全国各地的10名焊接精英(曾获得全国职工职业技能大赛焊工决赛的前10名选手)现场施焊，向观众表演了精湛的技术。同时应大会的要求，对演示会指定用焊机进行工艺性能评定。经研究决定，分别就演示用CO2焊机的引弧性能、电弧燃烧稳定性、焊接电流稳定性、焊接操作舒适程     

焊割精英齐聚京城 时代产品尽展雄风

在2004年召开的“第九届北京埃森焊接与切割展览会”上，时代焊机以216m^2的展出面积创下了有史以来参展面积之最，在展会上呈现出一道亮丽风景线。     

C25型摩擦焊机在刀具焊接方面的应用

针对生产刀具规格和材料品种较多的情况,就C25型摩擦焊机代替闪光对焊机应用在刀具焊接上进行了一系列工艺调试和生产应用,认为摩擦焊机焊接性能优于闪光焊机。     

新型WSE—315型方波交直流逆变多功能焊机的研究

采帮双逆变焊技术研制了一台交直流钨极氩弧焊多功能焊机。介绍了其工作原理，并对逆变主电路及控制方案的设计进行了分析和讨论。     

胫骨生物陶瓷复合材料的微结构增韧机理

扫描电镜观察显示胫骨是一种由羟基磷灰石和胶原蛋白组成的自然生物陶瓷复合材料.羟基磷灰石具有层状的微结构并且平行于骨的表面排列.观察也显示这些羟基磷灰石层又是由许多羟基磷灰石片所组成,这些羟基磷灰石片具有长而薄的形状,也以平行的方式整齐排列.基于在胫骨中观察到的羟基磷灰石片的微结构特征,通过微结构模型分析及实验,研究了羟基磷灰石片平行排列微结构的最大拔出能.结果表明,羟基磷灰石片长而薄的形状以及平行排列方式增加了其最大拔出能,进而提高了骨的断裂韧性.     

冲压件小螺纹底孔翻边参数的修正

结合长期的实践体会,分析了冲压件小螺纹底孔翻边参数,对冲压件小螺纹底孔部分翻边参数进行了有效的修正,修正后的参数在长期的运用中效果较佳。     

锤杆导程及导板拉伤的修补工艺

介绍了空气锤锤杆导程及导板拉伤缺陷及其修复工艺，效果十分理想。     

Development of the technology of ultrasonic welding of components made of Capron tapes

The technology of ultrasonic welding of components made of Capron tapes producing welded joints with high strength parameters has been developed. The numerical values of the main parameters of the conditions of ultrasonic welding of the Capron tapes are determined. It is shown that the increase in the amplitude and welding pressure shortens the welding time. The experimental results show that the Capron tapes are characterized by geometrical homogeneity in both the transverse and longitudinal direction so that the welded joints can be produced both along and across the tape.     

钢材打捆机控制系统智能化技术的研究

钢材打捆机是一种用于轧钢精整工艺的新型自动化设备，其控制系统基于SiemensS7 PLC和TP7触摸屏。系统的智能化技术主要包括：液压高低压自动控制、在线监视、离线故障检测、多台设备协同工作、可视化人机交互技术。本文描述了这些技术的原理与实现方法。     

Ab-initio calculation of enthalpies of formation of intermetallic compounds and enthalpies of mixing of solid solutions

A large number of ab-initio calculations of energies of formation of intermetallic compounds have been performed in the last 15 years. The currently used methods are listed. The paper presents a review of the aluminium based compounds which have been studied. Comparisons of calculated and experimental enthalpies of formation are provided for aluminim-3d and-4d transition metal alloys at equiatomic composition. The modelling of the enthalpies of mixing of solid solutions based on a given lattice is described.     

FeCrAIW电弧喷涂层组织的致密化研究

采用激光辐照对FeCrAlW电弧喷涂层的组织进行致密化处理,借助扫描电镜和X衍射对涂层的组织进行了分析.测试了涂层的显微硬度.结果表明:涂层组织致密度提高,孔隙率明显降低.随着激光扫描速度的增加,涂层的显微硬度降低.在较低的扫描速度下,涂层与基体之间形成互熔区,涂层与基体之间产生良好的冶金结合.     

焊丝含碳量对高强度钢焊缝性能的影响

报导了焊丝中含碳量在0.09～0.18％范围内时对45CrNiMoV高强度钢焊缝力学性能的影响。随焊丝中含碳量的增加,接头强度上升,焊缝韧性下降。     

Optimization of the profile of axisymmetric components of nozzles

A mathematical model of a turbulent boundary layer, describing the non-stationary non-isothermal flow of an incompressible gas in axisymmetric channels with the heat exchange is constructed. The equations of motion, continuity, and energy; the closing relationships for the coefficients of friction; and the heat transfer at the appropriate boundary conditions can be used for the analysis of the effect on the processes of friction and heat transfer with subsequent synthesis of phenomena – investigation of their combined effect and the determination of correlations between them, together with optimization of the profile of the surface with the flow around from the viewpoint of minimizing the thermal loading and energy dissipation.     

Modelling of processes of thermochemical treatment of metals: traditions of Russian scientific school

Abstract

The paper is devoted to 100th anniversary of the outstanding Russian scientist professor Yuriy Mikhailovich Lakhtin – the founder of the world-famous scientific school of surface strengthening of metals and alloys. Lakhtin's scientific school is recognised for its contribution into research of processes of thermochemical treatment of metals and especially of nitriding. Today at the Department of Metal Science and Heat Treatment of MADI his followers continue the traditions of Lakhtin's scientific school. The development of technologies of surface engineering is based on complex modelling of physical processes realised by thermochemical treatment of metals. Thermodynamic models describe the interaction between metals and components of saturating atmosphere and predict phase composition of diffusion layer. Diffusion models of kinetics of saturation of metals allow us to calculate the rate of growth of diffusion layer and regulation of its depth and structure. Structural models determine quantitative dependence between parameters of structure (grain size, dispersed particles, etc.) and mechanical properties. These models allow us to estimate the level of strengthening by control of structural specifics of strengthened layer. On the basis of this complex of models, new efficient technologies of surface strengthening are developed.