SA335P91/10CrMo910异种钢的焊接工艺研究

当前,在国内外大型电厂的建设过程中,SA335P91钢已得到了广泛的应用,这就不可避免地出现了SA335P91钢种与其他耐热钢种的连接。本文结合具体的施工情况,详细介绍了SA335P91/10CrMo910异种钢焊接的施工方法以及焊接工艺,并通过多个工程焊接施工实践证明,其工艺是可行的,希望对电力建设各施工单位同类型钢种的焊接提供一定的借鉴。     

石化装置用SA335P91厚壁炉管焊接工艺研究

分析了SA335P91厚壁炉管焊接的冷裂敏感性 ,研究了焊接线能量和层间温度对P91钢的焊接接头冲击韧性的影响 ,并规定了手工氩弧焊的焊接线能量上、下限值和合理的层间温度     

浅谈P91＋12Cr1MoV异种钢超厚壁大径管焊接工艺

首次对SA335-P91＋12Cr1MoVG钢超厚壁大径管异种钢进行施焊,通过设置合理的焊接方法、工艺控制及焊接过程中的注意事项,使机组的运行正常,其结果表明此种工艺是可行的。     

耐热钢P5与不锈钢304H的焊接

对于SA335P5耐热钢弯头与SA312TP30 4H不锈钢管的异种钢焊接 ,根据使用工况等可以采用不同的焊接工艺方案。本文介绍了通过在SA335P5耐热钢弯头端堆焊过渡层 ,进行热处理和探伤后再与SA312TP30 4H不锈钢管的焊接 ,从而兼顾了耐热钢需要焊后热处理及不锈钢需保持防腐性能和抗晶间腐蚀的问题 ,通过焊接试验结果表明 :制定的焊接工艺已成功地用于乙烯裂解炉对流段的制造。     

SA335／P91钢焊接接头热处理工艺性分析

SA335／P91钢是在SA335／P9钢的基础上，添加Nb、V等合金，控制N含量得到的马氏体钢，具有高温强度高、抗蠕变性及抗氧化性能高等优点。因此，SA335／P91钢在国外大容量的机组中的过热器、高温再热器集箱及主蒸汽管道中得到了广泛的应用，在20世纪90年代我国在大容量机组中也开始使用。     

《金属加工(热加工)》2014年第4期要目

正常减压塔复合钢板焊接裂纹的原因分析新型焊丝组合在纵骨流水线上的试验及应用GB/T 5117—2012《非合金钢及细晶粒钢焊条》的主要变化异种金属的手工钨极氩弧焊铝合金管道焊接气孔原因及克服措施埋弧焊在LNG低温储罐底板焊接中的应用2.0MW风力发电机后底座的焊接工艺评定及应用SA335P91/10CrMo910异种钢的焊接工艺研究     

SA-335 P91钢全位置窄间隙热丝TIG焊接工艺及接头性能研究

针对SA-335 P91钢大口径管环缝,采用轨道式全位置热丝TIG焊机进行了窄间隙焊接。将整条环缝均分为16个区域,根据不同位置熔池受力状态对各区的焊接工艺参数进行修正设置,并对所获焊接接头的组织和性能进行了研究。所获焊缝和热影响区的组织均为回火马氏体,焊接接头的拉伸、弯曲、冲击等力学性能均满足要求。结果表明,窄间隙热丝TIG焊接工艺参数合理,分区修正设置恰当,能够满足SA-335 P91钢大口径管全位置焊接要求。     

SA—335MP11钢焊接工艺及分析

介绍了SA—335M P11钢的焊接性以及进行工艺试验的情况,对试验结果进行了分析,并对锅炉中此种材质的集箱筒体焊接工艺进行了分析,为以后进行相关材料的焊接工作积累了宝贵的经验。     

SA-335P91钢管热弯制造技术

对SA335P91钢的主要性能进行了介绍,并对热弯管工艺特点进行了分析,通过中频感应加热弯管和弯后热处理工艺试验,确定出满足材料使用性能和质量要求的中频感应加热弯管工艺,提出了制造中需控制的重要尺寸要素。     

P91钢的焊接特点及工艺

随着P91钢的大量使用,制定出符合该钢材特点的焊接工艺规范直接用于生产建设中,有很好的经济效益和社会效益.结合热电厂300MW机组安装工程,主要介绍了P91钢的性能特点以及其在焊接过程中容易出现的焊缝性能和热影响区性能的劣化问题,分析了P91钢焊接性.制定了P91钢的焊接工艺、热处理工艺以及在实际焊接操作过程中经常遇到的问题以及预防方法.通过采取合适的预热温度、焊接工艺方法和焊后热处理工艺,可以解决P91钢焊接过程中易出现的焊缝性能和热影响区性能的劣化问题,保证焊口的质量并使焊缝、熔合区及其热影响区能够获得较好的性能,满足其在火电厂中的高温运行要求.     

Minimal Realization of Linear Graph Models for Multi-physics Systems

An engineering system may consist of several different types of components,belonging to such physical"domains"as mechanical,electrical,fluid,and thermal.It is t...     

Quantum Cooperative Robotics and Autonomy

The intersection of Quantum Technologies and Robotics Autonomy is explored in the present paper.The two areas are brought together in establishing an interdisci...     

On the Relation of Load to Average Gap in the Contact Between Surfaces with Longitudinal Roughness

A computer simulation model for the contact between longitudinally-oriented rough surfaces has been formulated. This model closely duplicates the actual surf ace contact deformation behavior by taking into account the elastic interactions between the asperities. There were no assumptions made about the shapes, or any deformation behavior of the asperities, except for their obeying the laws of elasticity. The plastic deformations on the high asperity peaks were taken into account by setting a ceiling on their contact pressures at the material hardness value. The simulations used real surface profiles which were digitized from unworn circumferentially ground steel surfaces. Each pair of these profiles was mathematically combined to form an equivalent rough profile pressing against an infinitely rigid flat and having the appropriately adjusted elastic modulus. A total of 28 different pairs of profiles were used in the simulations. Each contacting pair was subjected to 30 different load levels and the local contact pressures and deformations were calculated. The contact simulations yielded some important mathematical relationships between parameters, such as the real area of contact, average gap, and average asperity load through statistical curve fitting. Two analytical functions were generated to relate the average load to average gap and the real area of contact to load.     

三绕组变压器的双绕组等效建模及在Matpower中的应用

针对实际电网存在着大量的三绕组变压器,但国际上一些著名商业软件,如BPA仿真软件、Matpower这一权威潮流计算开源软件,均只提供双绕组变压器模型,限制了其在具有三绕组变压器的电力系统中的应用的问题,潮流计算是自主开发的电力系统各种应用软件的核心模块,因此依托国际权威开源程序进行二次开发,是一种较好的选择。对Matpower要求的数据格式进行了归纳,对变压器的一般的等值电路及带理想变压器的等值电路和带标幺值的等值电路进行了分析研究,提出了三绕组变压器转换为双绕组等效模型的建模方法,使得原先只适应双绕组变压器的潮流计算软件可以适用于三绕组变压器电网的潮流计算;最后以Matpower软件为例进行了案例计算,并用PSASP仿真软件进行对比验证。研究结果证明,所提出的建模方法是有效的。     

电站锅炉模糊风险评价方法研究与应用

针对电站锅炉风险等级评价问题,将模糊综合评价技术应用到电站锅炉风险等级评价中。开展了电站锅炉失效影响因素及模糊评价因素的重要程度分析,建立了一套科学合理适于在线评价的电站锅炉风险评价体系,提出了模糊综合评价技术与改进的模糊层次分析法相结合的模糊风险评价方法,利用改进的模糊层次分析法计算了指标体系中各层指标权重。对某一台电站锅炉的实际运行工况影响子因素进行了模糊风险评价,采用模糊合成算子进行模糊综合运算得到电了站锅炉运行工况影响子因素的评价向量。研究结果表明:电站锅炉的运行工况影响子因素的风险评价等级为第6级,失效可能性等级为小,该电站锅炉运行工况良好。     

考虑进油孔有限长滑动轴承油膜力的近似解析解

针对具有进油孔的有限长滑动轴承油膜力求解问题,采用变分原理和分离变量法,求得了有限长滑动轴承油膜压力分布的近似解析表达式。将油膜压力分布的近似解析表达式在油膜存在区域上进行积分,即得到了油膜力。将提出的计算有限长滑动轴承油膜力方法与无限长轴承模型、有限元方法的计算结果进行了比较,发现了提出的方法与有限元方法的计算结果很接近。最后,研究了进油孔位置和进油压力对油膜存在区域、油膜力等的影响,研究结果表明进油孔位置和进油压力对油膜存在区域和油膜力有较大的影响。     

INTEGRAL EQUATION METHOD＇S APPLICATION IN HOLE-EDGE STRESS OF COMPOSITE MATERIAL PLATE WITH DIFFERENT SHAPED HOLES

The strength of composite plate with different hole-shapes is always one of the most important but complicated issues in the application of the composite material. The holes will lead to mutations and discontinuity to the structure. So the hole-edge stress concentration is always a serious phenomenon. And the phenomenon makes the structure strength decrease very quickly to form dangerous weak points. Most partial damage begins from these weak points. According to the complex variable functions theory, the accurate boundary condition of composite plate with different hole-shapes is founded by conformal mapping method to settle the boundary condition problem of complex hole-shapes. Composite plate with commonly hole-shapes in engineering is studied by several complex variable stress fimction. The boundary integral equations are founded based on exact boundary conditions. Then the exact hole-edge stress analytic solution of composite plate with rectangle holes and wing manholes is resolved. Both of offset axis loadings and its influences on the stress concentration coefficient of the hole-edge are discussed. And comparisons of different loads along various offset axis on the hole-edge stress distribution of orthotropic plate with rectangle hole or wing manhole are made. It can be concluded that hole-edge with continuous variable curvatures might help to decrease the stress concentration coefficient; and smaller angle of outer load and fiber can decrease the stress peak value.     

Fifth International Summer School on Screw-Theory Based Methods in Robotics

正3-11 September,2014University of Bologna,Bologna,Italy www.summerscrews.org summerscrews2014.ing.unibo.it SUMMER 20SCREWS 14In 2014,our screw-theory school comes to the world's oldest university.In early September,Summer Screws'14 will gather six experts in the application of screw theory in robotics and up to 40 participants at the University of Bologna,Bologna,Italy.The school will teach attendees how to apply existing methods and empower them to develop new ones in their own research.The basic theoretical notions will be introduced in a rigorous manner,emphasizing examples,applications,and exercises.Scholarships are available.     

交通荷载作用下桥梁结构参数识别方法

应用动力节点加载法,将作用在桥梁上的交通荷载转化为等效节点荷载,再用两步构造法识别结构物理参数.第1步,用Newmark-β方法变换结构运动方程,并用结构的加速度响应求得变换空间内的位移、速度和加速度响应;第2步,基于最小二乘原理,构造出变换空间内求解结构参数的递推式,进行结构物理参数识别.数值模拟结果表明,在交通荷载作用下,该方法能够快速、准确地进行桥梁结构参数识别.     

INDUSTRIAL ENGINEERING AND VISUALISATION-A PRODUCT DEVELOPMENT PERSPECTIVE

Taking the actual project of teaching and researching process for example, the relationship between the industrial engineering and product development is discussed. And use the novel visualization technology to support the industrial engineering and product development. How to use the new computer modeling and simulating technologies to support the product development and industrial engineering, is introduced especially. The support includes both domestic products and industrial systems. The visualization and computer technologies take a very important role in some system or multi-direction modeling, those technologies mentioned above can help the industrial engineers study the effect of design on the whole life circle, including the producing steps. So the engineers can avoid making the wrong decision which may cause bad effects on the whole industrial engineering.