河南科技大学专业英语焊接部分.doc

Introduction to Welding Processes介绍焊接过程 3.1.1 Definition and Classification of Welding Processes焊接过程的定义与分类 Welding is essential for manufacture of a range of engineering components, which may from very large structures such as ships and bridges to miniature components for microelectronic application焊接是必不可少的制造一系列工程组件,这可能从大结构如船舶、桥梁、微型组件应用微电子 Several alternative definitions are used to describe a weld,for example: A union between two pieces of metal rendered plastic or liquid by heat or pressure or both. A filler metal with a melting temperature of the same order of that of the parent metal may or may not be used. 几种不同的定义是用来描述一个焊接,例如: 之间的结合,两块金属呈现塑料或液体加热或压力或两者。一个填充金属熔点温度相同的秩序的母材可能会或可能不会被使用。 Or alternatively: A localized coalescence of metals or nonmetals produced either by heating the materials to the welding temperature, with or without the application of pressure , or by the application of pressure alone , with or without the use of a filler metal. 或者: 一个本地化的聚结的金属或非金属材料加热生产通过对焊接温度,有或没有应用程序的压力,或由应用程序的压力,仅在使用或不使用的填充金属。 Based on these definitions welding processes may be classified into those which rely on the application of pressures and those which used elevated temperatures to achieve the bond. The most important processes are shown in Figure 3.1基于这些定义焊接过程可以分为那些依赖于应用程序的压力和那些使用高温达到债券。最重要的流程如图3.1所示 3.1.2 Fusion Welding The most widely used welding processes rely on fusion of the components at the joint line. In fusion welding, a heat source melts the metal to form a bridge between the components 3.1.2熔焊 应用最广泛的焊接过程依赖于融合的组件的结合线。在熔焊,热源融化金属,形成一个组件之间的桥梁 The molten metal must be protected from the atmosphere-absorption of oxygen and nitrogen leads to a poor quality weld. Air in the weld area can be replaced by a gas which dose not contaminate the metal , or the weld can be covered with a flux . 必须保护熔融金属从大气吸收的氧气和氮气导致质量差的焊缝。空气在焊缝区可以被替换为一个气体不污染金属或焊缝可以覆盖一个通量。 A large number of fusion welding processes and techniques are available No process is universally best. Each has its ow