基于LabVIEW的焊接参数管理系统

分析了当前国内焊接车间工艺及质量管理与控制方面普遍存在的问题,基于Lab VIEW平台与Oracle数据库设计了一套焊接车间焊接过程参数管理系统软件。通过嵌入式采集板实现焊接参数的采集,并经Zig Bee无线网络将采集信息发送至上位机,由Lab VIEW编制的上位机软件完成数据处理,实现对焊接车间各个工位工艺参数的实时监控、焊工与焊机管理、焊接过程参数管理等功能,具体包括:报表输出、波形显示、工艺超标报警、焊工与焊机管理以及焊接接头数据存储、查询、分析等功能;结合Lab VIEW的界面发布功能,通过企业以太网实现监控界面信息共享。该系统具有友好的人机交互界面,可方便地实现界面切换和各项操作,提高了焊接车间工艺管理的效率,实现了焊接产品的质量追溯,促进了焊接生产管理的智能化与高效化。     

焊接系统中无线监控的设计与实现

分析了焊接车间中几台以上的电焊机的智能控制管理系统,详细介绍了无线控制的设计与实现,介绍了整个监控系统的方案设计以及监控软件的实现。分析了中央控制室PC机监控系统的设计、监控系统的通信系统和远程测控终端系统的设计。从软件的角度分析了人机界面设计、PLC数据采集(包括通信协议的采用、IP地址的分配)和数据库选用和数据登录,其设计方案对智能焊接系统的设计有一定的参考作用。     

基于网格技术的焊接车间信息管理系统研究

在分析网格技术特点和网格体系结构的基础上,针对焊接车间异构信息集成化管理的要求,结合网格技术资源整合和处理能力强的特点,提出一种基于网格技术的焊接车间信息管理系统设计方案,构建并完成了各功能模块的设计。网格技术在焊接车间管理中的应用研究,对于解决焊接过程异构数据信息融合和促进焊接网络化生产发展有积极作用。     

基于网格技术的焊接车间资源异构信息研究

本文在分析网格技术特点和网格体系结构的基础上，针对焊接车间异构信息集成化管理的要求，对焊接车间的异构数据信息进行研究。网格技术在焊接车间异构信息的应用研究，对于解决焊接过程异构数据信息融合和促进焊接网络化生产发展有积极作用。     

数字化焊接车间的技术基础与结构

数字化焊接车间是未来几年焊接工厂建设的发展方向,数字化焊接车间在保证产品质量稳定性、生产管理高效性、生产故障的可追溯性等方面展现出重要的作用。在此结合艾美特公司多年数字化焊接系统的设计与制造经验,以及为客户提供数字化车间建设服务的经历,阐述了数字化焊接车间在现代生产加工中的重要作用,并分享艾美特公司数字化焊接车间的技术基础和结构模型。     

Structure and features of the digitalized welding workshop

数字化焊接车间是未来几年焊接工厂建设的发展方向,数字化焊接车间在保证产品质量稳定性、生产管理高效性、生产故障的可追溯性等方面展现出重要的作用.在此结合艾美特公司多年数字化焊接系统的设计与制造经验,以及为客户提供数字化车间建设服务的经历,阐述了数字化焊接车间在现代生产加工中的重要作用,并分享艾美特公司数字化焊接车间的技术基础和结构模型.     

一种焊接联网监控技术的应用与改进

本文介绍了一种焊接联网监控系统的组建及应用和改进,在应用信息化焊接管理系统iweld3的基础上,结合生产实际做了进一步改进与开发,实现了CO气体保护焊机的联网监控技术,达到了焊机2远程控制、焊工操作及信息管理、焊接工艺预置、成本管理、设备管理、品质管理等功能,其成功应用于焊接生产中,将提高焊接质量保证和追溯分析水平,加强成本控制及焊工管理,达到焊接信息化、精细化管理,节约管理成本并可提高管理效率,实现降本增效的目的。     

基于WSN的焊接环境监控系统

为了实现对封闭焊接环境内有害气体的检测和处理,设计了一种基于WSN的环境监控系统。系统通过无线自组织和多跳路由的方式构成动态分布式网络,实现了外部网关与感知节点的相互通信。详细介绍了系统的总体架构、硬件设计、软件设计。通过在焊接生产车间实际测试,运行结果表明系统具有较强的灵活性和容错性,能够实现高密度的快速部署,完全满足焊接车间对有害气体在线实时检测和处理的需要,应用价值高。     

信息技术在焊接自动化中的应用

信息技术在焊接自动化领域的应用促进焊接向智能化和自动化迈进了一大步.自动焊领域的信息技术包括信息的获取技术、信息的传输技术、信息的存储技术和信息的分析与统计技术.经过处理的信息反过来作用于焊接自动化可以使单机系统的智能度、自动化程度以及工作精确度大大提升；将多台单机的运行信息通过网络集合起来可以组建信息化焊接车间,提高整个焊接工序的运行效率和生产管理的合理性；将长期的设备运行信息、工艺参数数据进行汇总、分析,可以用来指导焊接工艺的改进,建立设备档案为设备维护提供基础.结合艾美特公司多年数字化焊接系统的设计与制造经验,以及为多个大客户提供数字化车间建设服务的经历,阐述焊接自动化领域中信息技术的重要性以及如何将信息技术可靠、高效的应用.     

面向CIMS的焊接车间计划管理系统

根据焊接车间生产计划管理的实际需求,采用Visual C 6.0开发了面向CIMS下的焊接车间计划管理系统,实现了车间计划信息的集成化管理.该系统优化了复杂的生产过程,解决了生产过程中出现的等待时间长、在制品占用量大、信息反馈慢以及生产不均衡的问题,有利于提高焊接车间的生产效益.     

Effects of Post-weld Heat Treatment on Microstructure,Mechanical Properties and the Role of Weld Reinforcement in 2219 Aluminum Alloy TIG-Welded Joints

In as-welded state, each region of 2219 aluminum alloy TIG-welded joint shows diff erent microstructure and microhardness due to the diff erent welding heat cycles and the resulting evolution of second phases. After the post-weld heat treatment, both the amount and the size of the eutectic structure or θ phases decreased. Correspondingly, both the Cu content in α-Al matrix and the microhardness increased to a similar level in each region of the joint, and the tensile strength of the entire joint was greatly improved. Post-weld heat treatment played the role of solid solution strengthening and aging strengthening. After the post-weld heat treatment, the weld performance became similar to other regions, but weld reinforcements lost their reinforcing eff ect on the weld and their existence was more of an adverse eff ect. The joint without weld reinforcements after the post-weld heat treatment had the optimal tensile properties, and the specimens randomly crack in the weld zone.     

The First Phase of the SRIF Industrialized Base in ＂West Area＂ Has Been Put into Operation

After nearly two years＇ tense construction, the first phase of industrialized base of Shenyang Research Institute of Foundry （SRIF）, located at the Tiexi Casting and Forging Industrial Park in the west of Tiexi District, has now been completed and formally put into operation.     

Thermodynamics Study on the Decomposition of Chromite with KOH

Institute of Process Engineering, Chinese Academy of Sciences, China, has proposed a method for oxidative leaching of chromite with potassium hydroxide. Understanding the mechanism of chromite decomposition, especially in the potassium hydroxide fusion, is important for the optimization of the operating parameters of the oxidative leaching process. A traditional thermodynamic method is proposed and the thermal decomposition and the reaction decomposition during the oxidative leaching of chromite with KOH and oxygen is discussed, which suggests that chromite is mainly destroyed by reactions with KOH and oxygen. Meanwhile, equilibrium of the main reactions of the above process was calculated at different temperatures and oxygen partial pressures. The stable zones of productions, namely, K2CrO4 and Fe2O3, increase with the decrease of temperature, which indicates that higher temperature is not beneficial to thermodynamic reactions. In addition, a comparison of the general alkali methods is carried out, and it is concluded that the KOH leaching process is thermodynamically superior to the conventional chromate production process.     

Influence of Heat Treatment on Damping Behaviour of the Magnesium Wrought Alloy AZ61

The effect of isochronal heat treatments for 1h on variation of damping, hardness and microstructural change of the magnesium wrought alloy AZ61 was investigated. Damping and hardness behaviour could be attributed to the evolution of precipitation process. The influence of precipitation on damping behaviour was explained in the framework of the dislocation string model of Granato and Lücke.     

Effect of Rare Earth Doping on Impedance,Modulus and Conductivity Properties of Multiferroic Composites:0.5(BiLa_xFe_(1-x)O_3)–0.5(PbTiO_3)

The Lanthanum-doped bismuth ferrite–lead titanate compositions of 0.5(Bi LaxFe1-xO3)–0.5(Pb Ti O3)(x = 0.05,0.10,0.15,0.20)(BLxF1-x-PT) were prepared by mixed oxide method.Structural characterization was performed by X-ray diffraction and shows a tetragonal structure at room temperature.The lattice parameter c/a ratio decreases with increasing of La(x = 0.05–0.20) concentration of the composites.The effect of charge carrier/ion hopping mechanism,conductivity,relaxation process and impedance parameters was studied using an impedance analyzer in a wide frequency range(102–106Hz) at different temperatures.The nature of Nyquist plot confirms the presence of bulk effects only,and non-Debye type of relaxation processes occurs in the composites.The electrical modulus exhibits an important role of the hopping mechanism in the electrical transport process of the materials.The ac conductivity and dc conductivity of the materials were studied,and the activation energy found to be 0.81,0.77,0.76 and 0.74 e V for all compositions of x = 0.05–0.20 at different temperatures(200–300 °C).     

Quantitative Analysis of the Crystallographic Orientation Relationship Between the Martensite and Austenite in Quenching–Partitioning–Tempering Steels

The orientation relationships(ORs)between the martensite and the retained austenite in low-and medium-carbon steels after quenching–partitioning–tempering process were studied in this work.The ORs in the studied steels are identified by selected-area electron diffraction(SAED)as either K–S or N–W ORs.Meanwhile,the ORs were also studied based on numerical fitting of electron backscatter diffraction data method suggested by Miyamoto.The simulated K–S and N–W ORs in the low-index directions generally do not well coincide with the experimental pole figure,which may be attributed to both the orientation spread from the ideal variant orientations and high symmetry of the low-index directions.However,the simulated results coincide well with experimental pole figures in the high-index directions{123}_(bcc).A modified method with simplicity based on Miyamoto’s work was proposed.The results indicate that the ORs determined by modified method are similar to those determined by Miyamoto’method,that is,the OR is near K–S OR for the low-carbon Q–P–T steel,and with the increase of carbon content,the OR is closer to N–W OR in medium-carbon Q–P–T steel.     

Growth Kinetics of Single Inclusion Particle in Molten Melts

On the basis of the single-particle framework, a new theory on inclusion growth in metallurgical melts is developed to study the kinetics of inclusion growth on account of reaction and collision. The studies show that the early growth of inclusion depends on reaction growth and Brawnian motion collision, and where the former is decisive, the late growth depends on turbulence collision and Stokes＇ collision, and where the former is dominant; collision growth is very quick during the smelting process, lessened in the refining process, but nearly negligible in the continuous casting process.     

Theoretical Analysis for the Motion and Temperature of Melt Droplets in Spray Degassing Process

The motion of melt droplets in spray degassing process was analyzed theoretically. The height of the treatment tank in spray degassing process could be determined by the results of theoretical calculation of motion of melt droplets. To know whether the melt droplets would solidify during spraying process, the balance temperature of melt droplets was also theoretically analyzed. Then proof experiments for theoretical results about temperature of melt droplets were carried. In comparison, the experimental results were nearly similar to the calculation results.     

Using Finite Element and Contour Method to Evaluate Residual Stress in Thick Ti-6Al-4V Alloy Welded by Electron Beam Welding

This work was to reveal the residual stress profile in electron beam welded Ti-6Al-4V alloy plates(50 mm thick) by using finite element and contour measurement methods.A three-dimensional finite element model of 50-mmthick titanium component was proposed,in which a column–cone combined heat source model was used to simulate the temperature field and a thermo-elastic–plastic model to analyze residual stress in a weld joint based on ABAQUS software.Considering the uncertainty of welding simulation,the computation was calibrated by experimental data of contour measurement method.Both test and simulated results show that residual stresses on the surface and inside the weld zone are significantly different and present a narrow and large gradient feature in the weld joint.The peak tensile stress exceeds the yield strength of base materials inside weld,which are distinctly different from residual stress of the thin Ti-6Al-4V alloy plates presented in references before.     

Microstructures and Tensile Properties of Ultrafine-Grained Ni–(1–3.5) wt% SiC_(NP) Composites Prepared by a Powder Metallurgy Route

Silicon carbide nanoparticle-reinforced nickel-based composites(Ni–Si CNP),with a Si CNPcontent ranged from1 to 3.5 wt%,were prepared using mechanical alloying and spark plasma sintering.In addition,unreinforced pure nickel samples were also prepared for comparative purposes.To characterize the microstructural properties of both the unreinforced pure nickel and the Ni–Si CNPcomposites transmission electron microscopy(TEM) was used,while their mechanical behavior was investigated using the Vickers pyramid method for hardness measurements and a universal tensile testing machine for tensile tests.TEM results showed an array of dislocation lines decorated in the sintered pure nickel sample,whereas,for the Ni–Si CNPcomposites,the presence of nano-dispersed Si CNPand twinning crystals was observed.These homogeneously distributed Si CNPwere found located either within the matrix,between twins or on grain boundaries.For the Ni–Si CNPcomposites,coerced coarsening of the Si CNPassembly occurred with increasing Si CNPcontent.Furthermore,the grain sizes of the Ni–Si CNPcomposites were much finer than that of the unreinforced pure nickel,which was considered to be due to the composite ball milling process.In all cases,the Ni–Si CNPcomposites showed higher strengths and hardness values than the unreinforced pure nickel,likely due to a combination of dispersion strengthening(Orowan effects) and particle strengthening(Hall–Petch effects).For the Ni–Si CNPcomposites,the strength increased initially and then decreased as a function of Si CNPcontent,whereas their elongation percentages decreased linearly.Compared to all materials tested,the Ni–Si CNPcomposite containing 1.5% Si C was found more superior considering both their strength and plastic properties.