基于ASP.NET的B/S模式焊接工艺文档编制与管理系统开发

在分析石油化工建筑安装企业生产制造过程中,各种焊接工艺文档相互间的关系及管理流程的基础上,提出了一种采用ASP．NET技术和3层结构体系开发实现B／S模式焊接工艺文档制定与管理系统的解决方案;并基于水晶报表工具实现了工艺文档的打印输出,同时,系统采用通用化管理模块实现了用户权限和文档流程管理。     

航空用焊接数据库及专家系统平台的设计与开发

为提高焊接生产过程的数字化水平,研发了集焊接数据库平台、工艺设计专家系统平台和焊接信息管理平台为一体的焊接数据库及专家系统。其中数据库平台用于实现对焊接基础数据、焊接试验数据、成熟焊接工艺数据和焊接质量诊断案例数据在内的焊接数据的存储和管理;工艺设计专家系统基于知识库和推理机实现了手工钨极氩弧焊、自动钨极氩弧焊、电阻焊和真空电子束焊焊接工艺文件的自动设计及打印;焊接信息管理平台在数据库平台、专家系统平台及用户权限管理基础上,实现了对焊接工艺流程的在线管理和控制。实践证明,该系统很好地实现了焊接工艺过程在局域网内协同智能办公的目的。     

RBAC在分布式监控和故障诊断系统中应用

针对Web服务体系结构模式下机电设备分布式监控故障诊断系统中的安全问题，文章提出了运用基于角色的访问控制模型来建立其系统资源的安全访问控制策略，减少了系统授权管理的复杂性，实现了用户与访问权限的逻辑分离，极大地方便了权限管理，有效地保证了用户合法地使用系统资源。文章具体分析了系统资源功能节点树和系统权限框架数据库关系表的建立方法以及访问控制程序流程。     

钢材焊接基础数据库及焊接性分析系统设计

针对钢铁制造业的实际需要,设计了钢材焊接基础数据库系统和焊接性分析系统.数据库系统包含了母材和焊接材料成分与性能数据、焊接性分析试验数据及成熟钢材焊接工艺.同时,在材料焊接性分析知识总结的基础上,综合运用数据库及面向对象编程技术,结合相关焊接专业知识及经验,设计了焊接性预算分析专家系统.该系统能对常用钢材进行焊接性分析,对已知成分的新材料可通过相关数学模型计算,进行焊接性预测.系统进行了多权限用户设计,不同权限的用户在局域网内协同使用,提高了系统的使用效率.系统基于C/S结构模式,具有一定的操作稳定性和数据安全性.     

基于Android系统的焊接应用软件设计

本文介绍了一种基于Android操作系统的焊接应用软件,安装了应用软件的手持PAD设备,通过无线WIFI技术实现与数字化焊接设备的远程通讯控制,软件的主要功能包括实时获取焊接工艺参数及状态,远程设置焊接工艺参数,创建焊接工艺专家数据库。软件的设计提高了焊接管理的易用友好性,增强了工艺质量可靠性,减轻了焊接管理者工作量。     

管理信息系统权限约束体系的研究与实现

对MIS系统的权限约束体系进行了系统研究,在"用户/角色/功能权限"三级权限约束的基础上,提出完整的权限约束体系方案,包括用户及密码管理、用户隶属关系管理、功能模块访问约束管理、功能模块操纵权限约束管理和功能模块字段访问约束控制管理等.实践表明:MIS的权限约束方案可以很好地解决困扰MIS系统权限约束控制管理问题,该通用、易用、安全、动态和成熟的方案给软件开发人员和使用单位带来良好的经济效益和社会效益.     

基于角色访问控制的动态权限配置研究与实现

ERP系统可实现对企业的管理,随着企业的规模扩大,职责分工的细化,易造成责任不明,产生管理的困难,权限问题已成为影响系统安全性的重要问题.基于角色的访问控制(RBAC)强调用户的权限不是由用户名而是由用户在组织中的角色决定的,通过角色间接的访问系统资源.文章研究了RBAC的体系架构,通过角色的桥梁作用实现了用户与权限的对应关系,保证了权限配置的灵活性和安全性要求;并通过与数据库的紧密结合,结合佛山某企业应用实际,实现了用户权限实时的灵活动态配置.     

井下无轨铲运机焊接工艺管理系统研究

针对井下无轨铲运机焊接结构件工艺流程复杂、工艺文件更新频繁的特点,开发了其焊接生产工艺信息管理系统。系统采用C/S和B/S相结合的网络体系结构,可有效地利用金川集团现有的计算机及网络资源。整个系统可以实现铲运机焊接生产工艺文件的编写、校对、审批、资源信息查询等操作,并根据使用人员的权限实现工艺数据库的维护与网络化管理,提高了焊接工艺设计和维护的效率。     

人工智能在铸铁焊修技术中的应用

将专家系统技术应用于铸铁焊修领域，开发研制了相关的计算机软件，其软件是由知识库系统，图形图象库系统，推理机，用户界面四大部分组成，主要用于完成焊接工艺制定，焊接实例查询，焊接材料介绍，焊后缺陷弥补四大功能，其主要特点是实现了领域知识的图形表示并开发了图文并茂的用户界面。     

Windows环境下的大截面工件闪光焊的控制与管理

在Ｗｉｎｄｏｗｓ环境下应用程序设计语言ＶｉｓｕａｌＣ＋＋和数据库Ａｃｃｅｓｓ,开发了大截面工件闪光焊机的专用软件系统。该系统集控制与管理的功能于一体,并可根据用户的身份区操作权限,保证了系统数据的安全和软件的合理使用,充分发挥了工业用ＰＣ机的控制和管理功能。     

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.