焊接方法对双相不锈钢焊接接头力学性能的影响

研究了不同焊接方法对SAF2205双相不锈钢板焊接接头金相组织和力学性能的影响,结果表明,采用不同焊接方法得到的焊接接头的铁素体与奥氏体两相比例不同,使焊接接头的力学性能存在较大差异,对实际生产中SAF2205双相不锈钢的焊接具有一定的指导意义。     

龙滩工程按正常蓄水位400m方案一次建成效益巨大

2003年11月龙滩工程将实现大江截流，随着工程建设的全面推进，越发显出实施龙滩水电站正常蓄水位400m一次建成方案的重要性和紧迫性。相对分期建设而言，400m水位一次建成，工程效益大、增加投资少、无后期加高过程中的各种技术难题，基本不影响电站的初期发电效益，水轮机设计与运行问题少、机组运行条件好，电站规模效益与社会综合效益巨大，有利于移民安置和库区经济的发展，对国家、地方、企业均十分有利，因此应尽快决策实施400m一次建成方案。     

Onset of gas self-induction and power consumption after gas induction in an agitated tank

The behavior of inducted gas from liquid surface and the; power requirements in an agitated tank using a mechanical agitator are studied in order to increase the amount of gas self-induction and the gas retention time for gas absorption. A 45° six-blade downward impeller turbine was utilized in this study. Air and water, air and 40 wt% 60 wt%, and 80 wt% of glycerin water, and air and 106 cP silicon oil were employed as gas and liquid phases. Variables which were studied included geometrical factors (immersed depth of impeller, baffle with and diameter of impeller) and the physical properties of the liquid (viscosity, density, and surface tension). The correlations for the onset speed of impeller and power consumption after gas induction in the agitated tank are established from our experimental results. The amount of gas self-induction from the liquid surface in the agitated tank increases with increasing impeller diameter and speed and decreases with increasing baffle width, depth of impeller and viscosity of liquid.     

新一代高强韧性WDL系列钢综合性能及应用

本文着重介绍武汉钢铁公司近年来研制开发的第二代高强度低合金钢—高强韧性WDL系列钢的综合性能及应用情况。该钢具有优异的焊接性能和低温韧性,板厚≤50mm钢板焊前不预热或稍加预热而不产生焊接裂纹,是制造大型压力容器（特别是低温和常温球罐）、水电站压力钢管和水轮机蜗壳、高寒地区使用的大型工程机械、大跨度桥梁及海上采油平台等装备的理想用材。     

脉冲啁啾对干涉相关测宽的影响及其消除方法

本文深入讨论了脉冲啁啾的非线性起源及其对干涉相关测宽(等值宽度和条纹计数)法的影响。提出根据干涉相关曲线下包络最大值位置适当降低等值宽度位置和用计算机平均处理干涉相关信息的技术以消除啁啾的影响。     

10000m^3天然气球罐用WEL—TEN610CF钢焊接冷裂纹敏感性

WEL-TEN610CF钢是日本新日铁公司生产的低裂纹敏感性高强钢,结合我国首台国产化10 000 m3天然气球罐用37 mm厚WEL-TEN610CF钢焊接性试验研究,对该钢焊接冷裂纹敏感性进行了综合评定,为其焊接工艺的制订提供了可靠的依据。     

Metallurgical failure analysis of cold cracking in a structural steel weldment: Revisiting a classic failure mechanism

Cold cracking of structural steel weldments is a well-characterized, well-documented, and well-understood failure mechanism. Extensive effort has been put forth to recognize the welding and materials selection parameters that are conducive to cold cracking; however, these engineering efforts have not fully eliminated the occurrence of such failures. This article describes cold cracking failure specifically related to the construction industry. This particular failure was successfully identified prior to final erection of the structural member, and the weld was successfully reworked. These actions potentially prevented a serious catastrophic event that could have occurred have occurred either later in the construction process or possibly during the use of the building. Individual welding parameters, such as electrode/wire selection, joint design, and pre/postheating, played a role in the failure, and a number of human factors relating to the actual fabrication practices also contributed to the failure process.     

一种简易可靠的射频激光调制器

采用ＰＩＮ电调衰减器、ＴＬ４９４等元件组成了射频（ＲＦ）大功率ＣＯ２激光调制器，调制频率、占空比和调制度单独可调。给出了电路的工作原理和测试结果。     

川东北三叠系飞仙关组鲕滩气藏有利储集层的形成与分布

川东北地区三叠系飞仙关组鲕滩气藏是近年四川盆地碳酸盐岩天然气勘探取得重大突破的领域，目前在中国石油探区内已发现罗家寨、渡口河、铁山坡等大中型气藏。对鲕滩气藏白云岩储集层进行岩心观察、显微薄片分析，并进行微量元素、流体包裹体、X衍射、阴极发光及电子探针等分析，结果表明，白云岩化和多期溶蚀是形成优质白云岩储集层的关键因素，混合云化与埋藏云化的叠加作用是形成孔隙性白云岩储集层的基本条件。飞仙关组鲕滩气藏储集层经历了4期溶蚀作用，即同生期溶蚀作用、浅埋期溶蚀作用、深埋期溶蚀作用和抬升期溶蚀作用，形成优质白云岩储集层的主要溶蚀作用是浅埋期和深埋期的溶蚀作用。优质白云岩储集层主要分布在台缘鲕粒滩相带，纵向与亮晶鲕粒灰岩呈韵律性互层，横向主要分布在鲕粒滩坝靠近漏湖-潮坪一侧。     

液化石油气储罐火灾模拟试验——池火灾环境下

液化石油气储罐在火灾作用下，其内部的温度和压力会迅速上升，从而可能引起储罐爆炸，进而酿成危害性更大的二次灾害。为此，对液化石油气储罐在池火灾环境下的热响应情况进行了大量的模拟试验研究。研究发现，储罐在池火灾作用下存在着明显的热分层，热分层加速了储罐内部压力升高的速度；储罐内部温度分布和压力响应受到储罐类型、充装水平等因素的影响，压力随时间的变化关系可以用三次多项式加以拟合。