基于VC超声波探伤系统设计

介绍了一种基于VC++开发的高压无缝厚壁钢管超声波自动探伤检测系统,详细论述了系统的硬件组成原理及软件的设计思路和技术实现要点。实现了对4种不同管径的无缝钢管进行自动连续探伤,并可以保存4种不同规格钢管的探伤工艺和标准;系统将自动记录探伤结果,发现缺陷时自动报警喷标,并生成探伤报告;该系统对厚壁管探伤研究具有实践意义。     

单体液压支柱左阀筒表面裂纹成因分析

采用金相分析、化验等手段 ,研究了单体液压支柱左阀筒表面裂纹成因。结果表明 ,原材料存在浅表面微裂纹、夹杂气孔等冶金缺陷是导致裂纹产生的主要原因     

绞车大轴不解体超声波探伤(续)

<正> 四、探伤步骤及方法1.探伤步骤(1)测量各部尺寸,观察受力部位,确定探伤部位和探伤方法。(2)清洗磁粉探伤部位,超声波探伤头放置部位表面。(3)磁粉探伤。(4)磁扮探伤发现缺陷后,应用裂纹深度测量仪测量裂纹深度。(5)作好磁粉探伤记录。(6)超声波纵波探伤。(7)超声波横波探伤。(8)作好超声波探伤记录。(9)写出绞车大轴不解体探伤的综合报告,详见“工艺程序因果分析图”。     

1Cr17不锈钢管与Q235钢管焊接

1Cr17不锈钢管与Q235钢管的焊接属于异种钢焊接,焊接接头容易出现裂纹缺陷。通过认真分析,选用合适的焊接工艺并进行适当的焊后热处理,且采用单面焊双面成形是可以避免裂纹缺陷的产生,获得很好的焊接质量。     

煤矿机械设备超声检测技术的应用研究

为了探测煤矿大型机械设备的主要承载部件在煤矿机械制造过程中,因制造工艺、耦合性或生产过程中机械强度、疲劳强度等原因,造成设备内部存在缩孔、夹杂、白点及裂纹等情况,确保机械设备在运行中的人机安全,介绍了超声检测技术中的缺陷定位、定量和定性方法,并着重分析了缺陷定性方法,提出了缺陷的定性需要凭借经验,分析工件的材料、加工工艺、缺陷的特征和缺陷波形以及底波情况等,逐步分析缺陷的性质,并对白点、缩孔、夹杂、疏松和裂纹等缺陷波形进行了直观、细致的描述。为了消除非缺陷波对正确判别缺陷波的影响,分析了迟到波、三角反射波、侧壁干扰波的产生原因、波形特点以及辨识方法。     

S200M型掘进机回转台铸造工艺探讨

回转台是S2 0 0M掘进机关键部件 ,尺寸大、结构复杂 ,是掘进机上受力最大的零件。通过严谨的铸造工艺设计和严格的生产过程控制 ,可有效地防止回转台的铸造毛坯件产生铸造裂纹、缩孔、夹杂等缺陷 ,保证铸造质量     

高速列车车顶铜导体压接开裂原因分析及改进措施

针对铜导体压接过程中出现的开裂失效现象, 通过分析微裂纹与压接显微组织, 结合有限元计算压接后铜导体等效应力应变, 确定了开裂原因, 并采用结构优化与去应力退火消除开裂倾向、提高加工质量。结果表明: 压接过程使铜导体内壁产生了严重的压缩变形, 等效应变高达0.985, 等效应力达458 MPa。内壁压应力集中超过了铜导体材料的极限强度, 产生了微裂纹进而导致压接开裂现象。在铜导体内套入外径19 mm、壁厚2~4 mm的小管进行压接, 可以达到无间隙无过盈的良好配合, 有效降低铜导体的应力应变, 消除铜导体压接开裂现象。压接后铜导体进行300 ℃退火2~3 h, 可以有效消除残余应力并保持较高硬度及力学性能, 提高了铜导体的加工质量。     

超声波钢管砼检测技术及其在巫山长江大桥检测中的应用

介绍了超声波检测的基本理论及钢管砼超声波检测技术的原理,说明钢管砼超声检测主要检测钢管内混凝土密实程度、有无空洞及钢管内壁与混凝土间脱空情况,以及该技术在巫山长江大桥检测钢管砼中的应用情况。     

首钢迁安钢铁公司在线表面检测与质量信息的应用

迁安钢铁公司于2009年7月安装了parsytec在线表面质量检测系统5.1版-espresso HTx5.1。经过缺陷对比、图片收集以及分类器建立与优化等工作后,该系统具备了较高水平的缺陷检出率和分类率,利用该系统开展的主要工作包括:带钢表面缺陷检测与记录、汽车板表面质量分级,针对关键缺陷在线报警等。此外,在常规质量管理的基础上,通过对缺陷发生位置进行统计分析,结合缺陷样品微观分析,迅速掌握了缺陷发生的规律,并通过工艺或设备的调整解决了大量的质量问题,成功完成了管线钢裂纹,冷轧料基料舌型裂纹、车轮钢横向裂纹、IF钢边部翘皮等数十项表面缺陷攻关。     

超声波技术在钻杆90&#176;台阶端疲劳裂纹检测中的应用

在钻井过程中，部分90&#176;台阶钻杆由于制造工艺上的缺陷，在90&#176;台阶端形成应力集中，在交变负荷的作用下产生疲劳裂纹，最终导致钻杆失效。介绍采用超声波无损检测方法和技术，重点解决钻杆90&#176;台阶端裂纹型缺陷的大小和深度的精确检测，预防井下钻具事故的发生。     

China rare earth market review

正November 1~10,2014Chinese rare earth market was still inactive.Demand for rare earth products was weak.Consumers took a wait-and-see attitude for lower price.As it was an off season for rare earth products,it was expected that prices of rare earth could continue turbulence at the bottom in short terms.Due to a sharp drop,demand for rare earth from downstream recovered.Affected by new energy vehicles,wind powder and energy-efficient appliances,production of rare earth permanent     

China rare earth market review

正August 1~10,2014 There was some good news in rare earth industry recently.Restructuring plans of rare earth groups led by Baotou IronSteel Group and Xiamen Tungsten Group respectively have been approved by MIIT.And rare earth storage policy,which had been expected for a very long time,has been launched officially.Pushed by the good news,rare earth price started to rebound since August 5.Price of didymium oxide and dysprosium oxide rose about 1% to 2%,averagely.About 10% of     

China rare earth market review

正July 1~10,2014Due to weak demand from downstream industry and slow transactions,rare earth market remained weak and price of rare earth products continued to decline.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,     

New energy vehicle:an opportunity for rare earth magnets

<正>Extracted from Securities Guide 1.Popularity of new energy vehicles—an irresistible market trend1.1 Progress of new energy vehicles Chinese Premier Li Keqiang said recently on a visit to Xi'an BYD Autos that new energy vehicles,especially new energy bus,can lessen environment and noise pollution.He encouraged the use of new     

注浆加固技术在十三矿-685 m进风大巷中的应用

针对煤矿开采深度不断向深部延伸,掘进巷道受深部高应力的影响越来越大,巷道围岩整体稳定性差,矿山压力显现越剧烈现象,一般锚网喷加锚索支护无法从根本上控制巷道的变形。总结了平煤股份十三矿-685 m进风大巷注浆加固技术,依据对巷道掘进之后变形监测数据的采集,对巷道变形机理进行分析研究,并对注浆时段进行了合理选择,在对巷道的注浆工艺进行了充分论证的基础上,对巷道进行了注浆。注浆后效果表明:巷道滞后注浆时间段的选择非常重要,巷道在恰当的时间内进行注浆加固施工,能有效控制巷道的变形,巷道注浆后变形量明显减小,岩体的稳定性明显增强,减少了巷道日常维修工作,降低了矿井的生产成本,保障了矿井的安全生产。     

稀散金属产业的观察与思考

分析了近年来国内外稀散金属产业的生产、应用、资源与市场状况.铟锡氧化物靶材、砷化镓晶片、锗红外材料、铼高温合金和硒在电解锰及玻璃的应用等已成为稀散金属的主要应用领域.稀散金属的产量快速增长达到历史高位而导致了市场的失衡.以GaInP_2/GaAs/Ge,CIGS和CdTe为代表的非硅系太阳能电池是稀散金属的新兴应用领域,将给稀散金属带来日益增长的需求.     

China rare earth market review

正November 21~30,2014Due to weak demand from downstream industries,transactions of rare earth in Chinese domestic market were inactive.It was difficult to sell any rare earth products except for dysprosium oxide and terbium oxide.Suppliers lost confidence in recent market.Demand for rare earth products was soft.Consumers continued to take a wait-and-see attitude.Rare earth export market remained slow.     

Current situation and future trend of China rare earth luminescent materialindustry(continued)

<正>Developing ecological lighting source The world is facing the big problem of energy shortage today and the contradiction between economy development and environmental protection is worsened.Therefore,people are more likely to choose an ecological light source that is more energy efficient and environmental friendly.The choice provides great opportunity for the development of rare earth optical material industry in China.The concept of green lighting positions rare earth luminescent material as a leading player in illumination market.The light source of both rare earth luminescent lamp and LED lamp is ecological and energy saving.This is why     

Galaxy Magnets achieved the net profit of 34.02 million yuan in the first six months of 2014

正Galaxy Magnet announced its financial results for the first half of 2014 on August 14.For the first six months ended on 30 June 2014,Galaxy Magnet achieved operation income of RMB 182.3 million,up8.40% over the same period of 2013,and the net profit attributable to the shareholders of the listed company of 34.02 million yuan,increasing 35.49% over the same period of last year.Stable performance increase was led by development of new customers and application market of magnets.     

Rare Earth Application in Steel in China

<正>China has rich rare earth resources.Output of rare earth and steel in China ranks the top first in the world.However,there is still certain distance between the steel produced in China and developed countries from the point of varieties and quality.China still has to import some types of steel.Improving the quality should be emphasiZed in future development of steel industry in China.Rare earth can be used to upgrade traditional steel