吐丝圈径对大规格高碳盘条组织性能的影响

计算与分析了斯太尔摩冷线上盘条的吐丝圈径、搭接密度及"佳灵"装置横向布风曲线之间的关系,研究了吐丝圈径的大小对大规格82B盘条组织和性能的影响,确定了大规格82B盘条最小吐丝圈径应为980mm.     

Effects of modeling means on properties of monitoring models of spot welding quality

Analyzing and modeling the relation between monitoring information during welding and quality information of the joints is the foundation of monitoring resistance spot welding quality. According to the means of modeling, the known models can be divided into three large categories: single linear regression models, multiple linear regression models and multiple non-linear models. By modeling the relations between dynamic resistance information and welding quality parameters with different means, this paper analyzes effects of modeling means on performances of monitoring models of resistance spot welding quality. From the test results, the following conclusions can be drawn: By comparison with two other kinds of models, artificial neural network (ANN) model can describe non-linear and high coupling relationship between monitoring information and quality information more reasonably, improve performance of monitoring model remarkably, and make the estimated values of welding quality parameters more accurate and reliable.     

蓝疆号起重铺管船托管架拖挂结构的质量及进度控制

蓝疆号起重铺管船是一艘集起重、管道铺设于一身的多功能新型船舶,在铺管作业系统中,设有一连接船体与托管架的独立结构——拖挂结构。介绍这个由特厚高强钢板组焊而成的结构在制造过程和现场施工中的质量控制及进度控制,供从事工程管理人员参考。     

提高自蔓延陶瓷内衬钢管耐蚀性研究的进展

广泛应用于石油，化工，能源等领域的钢管，除了要有高强度外，还要有良好的耐蚀性。自蔓延高温合成技术是制备耐蚀钢管的新技术，具有工艺简单，成本低和产品耐蚀性能好等特点。介绍了自蔓延高温合成陶瓷内衬钢管的原理和提高陶瓷内衬钢管耐蚀性的措施，展望了耐蚀陶瓷内衬钢管在工业生产上的应用前景。     

MB8镁合金薄板的搅拌摩擦焊

针对我国航空航天工业常用的MB8镁合金。采用搅拌摩擦焊工艺进行焊接，对其焊缝的成形特点、组织特征和力学性能进行分析。结果表明，采用搅拌摩擦焊焊接镁合金效果良好。     

土工合成材料在防汛抢险中的应用

土工合成材料具有整体性强、抢险速度快、适应性强、储运方便、造价低、经久耐用和可废物利用的优点，在防汛抢险中主要起到排水、反滤和防渗的作用，常用于堤岸崩塌、基础管涌、堤身跌窝与漏洞、背水坡散浸、背水面脱坡、洪水浸顶和防风浪淘刷、涵闸及堵口等方面，可及时排队险情。     

浅析6063铝型材表面“铝丝印”的成因与对策

在介绍“铝丝印”概念的基础上，从金属腐蚀学的观点出发，分析了“铝丝印”形成的电化学腐蚀机理，并提出了具体的解决措施。     

古洞口水利水电工程泄洪洞工作弧门安装工艺

介绍了古洞口工程泄洪洞工作弧门在特定地形下采用固定卷扬式启闭机和汽车吊配合闸室的预埋件进行闸门安装的施工工艺。对闸门的吊装、调整及焊接工艺的具体措施作了详细分析,解决了该工作弧门在洞内安装的关键施工技术问题。     

In-situ composite Cu-Cr contact cables with high strength and high conductivity

In order to develop a new type of contact cable with high strength and high electrical conductivity, Cu-Cr alloy series were selected as materials and Cu-Cr alloy castings were produced by means of directional solidification continuous casting (DSCC) process. The results show that the fibrillar strengthening phase, 13-Cr, orderly arranges among the copper matrix phase along the wire direction; and a microstructure of in-situ composite forms, which retains the basic property of good conductivity of the copper matrix and meanwhile obtains the strengthening effect of [3-Cr phase. The production technology as well as the mechanical property, electrical property, and synthetic property of the in-situ composite contact cables was discussed.     

几种复合材料的简介

介绍几种主要复合材料的性能和使用情况,对我国的木材利用提供一些参考。