Posted on Categories:Welding Principle, 焊接原理, 物理代写

# 物理代写|焊接原理代写Welding Principle代考|WLD270 Nuclear Power

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## 物理代写|焊接原理代写Welding Principle代考|Nuclear Power

Nuclear power depends upon the generation of large, concentrated quantities of heat energy, rapid heat removal, a In addition to the reactor vessel, the system includes highly radioactive environment, and changes in the prop- a heat exchanger or steam generator and associated erties of radioactive materials. The heart of the process is equipment such as piping, valves, and pumps, as well a reactor pressure vessel used to contain the nuclear reac- as purification, storage, and waste disposal equiption, Fig. 2-16. ment. Welding is necessary for the fabrication of all these units. The production of nuclear energy would not be possible but for the highly developed processes of today.
Piping
High pressure pipeline work, with its headers and other fittings, is a vast field in which welding has proved itself. The number of ferrous and nonferrous alloys used as piping materials is increasing. Industry requires better materials to meet the high heat and high pressure operating conditions of power plants, nuclear plants, oil refineries, chemical and petrochemical plants, and many other manufacturing plants where steam, air, gas, or liquids are used. Pressure of over 1,000 p.s.i. and temperatures ranging from $-200$ to $+1,200^{\circ} \mathrm{F}$ are not uncommon in high pressure pipelines, Figs. 2-17 and 2-18. Marine lines and generator stations have installations operating at 1,250 p.s.i. with $950^{\circ} \mathrm{F}$ at turbine throttles. Demands for equipment in the steel mills, oil refineries, and other industries in which such lines operate emphasize reductions in size and weight and streamlining the appearance of piping as well as the flow. The lines are becoming increasingly complex: recirculation units, boosters, headers, and miscellaneous accessories and fittings are introduced into the lines, making Small pipe is connected with large pipe; T’s, bends, return valves, and other fittings are introduced into the lines, Fig. 2-19.

Welding is the principal method of joining materials used by the railroad industry. The railroads first made use of the process as a maintenance tool, and it has been extended to the building of all rolling stock. It is also used extensively in the construction and repair of equipment on the right-of-way.

Railroad units fabricated by welding include streamlined diesel and electric locomotives (Figs. 2-22 and 2-23), passenger cars, subways, freight cars, tank cars, refrigerator cars, and many other special types. Most new track is of the continuous welded type, and battered rail ends of old track are built up with the process.

Weight is an important consideration in the design of freight cars. In an entire trainload, a freight engine may be called upon to haul a string of up to 100 freight cars whose deadweight alone amounts to 2,400 to 3,400 tons. Welding and alloy steel construction reduced the weight of 50 -ton boxcars from a light weight (empty) of 48,000 to 36,000 pounds, a reduction of approximately 25 percent. These cars are also able to carry a 25 percent greater load than their former 50 -ton capacity.

Large cars are 50 feet in length and have a capacity of up to 100 tons and an empty weight of approximately 61,500 pounds. This is an increase of 100 percent in loadcarrying capacity and only 35 percent in empty weight. Cars constructed for automobile shipping service are 89 feet in length.

Another development in freight car construction is the super-sized aluminum gondola. The car is a third longer and almost twice as high as the ordinary gondola.

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## MATLAB代写

MATLAB 是一种用于技术计算的高性能语言。它将计算、可视化和编程集成在一个易于使用的环境中，其中问题和解决方案以熟悉的数学符号表示。典型用途包括：数学和计算算法开发建模、仿真和原型制作数据分析、探索和可视化科学和工程图形应用程序开发，包括图形用户界面构建MATLAB 是一个交互式系统，其基本数据元素是一个不需要维度的数组。这使您可以解决许多技术计算问题，尤其是那些具有矩阵和向量公式的问题，而只需用 C 或 Fortran 等标量非交互式语言编写程序所需的时间的一小部分。MATLAB 名称代表矩阵实验室。MATLAB 最初的编写目的是提供对由 LINPACK 和 EISPACK 项目开发的矩阵软件的轻松访问，这两个项目共同代表了矩阵计算软件的最新技术。MATLAB 经过多年的发展，得到了许多用户的投入。在大学环境中，它是数学、工程和科学入门和高级课程的标准教学工具。在工业领域，MATLAB 是高效研究、开发和分析的首选工具。MATLAB 具有一系列称为工具箱的特定于应用程序的解决方案。对于大多数 MATLAB 用户来说非常重要，工具箱允许您学习应用专业技术。工具箱是 MATLAB 函数（M 文件）的综合集合，可扩展 MATLAB 环境以解决特定类别的问题。可用工具箱的领域包括信号处理、控制系统、神经网络、模糊逻辑、小波、仿真等。