,机电技术专业英语,2,Lesson Four,Text,There are a number of methods of joining metal articles together, depending on the type of metal and the strength of the joint which is required. Soldering gives a satisfactory joint for light articles of steel, copper or brass, but the strength of a soldered joint is rather less than that of a joint which is brazed, riveted or welded1. These methods of jointing metal are normally adopted for strong permanent joints.,Welding,Lesson Four,New Words and Expressions,Lesson Four,Lesson Four,Notes,1. Soldering gives a satisfactory joint for light articles of steel, copper or brass, but the strength of a soldered joint is rather less than that of a joint which is brazed, riveted or welded. 锡焊焊接薄钢件、薄铜件或薄黄铜件，焊接效果很好，但其强度比铜焊、铆焊或焊接要低得多。 light articles 薄件； a joint 一条焊缝；“which” 引导定语从句修饰“a point”。 2. At this temperature the metal becomes plastic. The ends are then pressed or hammered together, and the joint is smoothed off. 在这种高温下，金属变成塑性体。然后，再把接头强压在一起或锤压在一起，最后把焊缝磨光。 ends表示金属两头；the joint is smoothed off, 焊缝被磨光 3. A number of different types of weld may be used, but a vshaped weld should be normally employed. 焊接的形式可以多种多样，但通常应采用V形焊缝。,Lesson Four,Lesson Four,参考译文,把金属件连接在一起的方法很多，因金属的类型和所需接缝的强度不同而异。锡焊焊接薄钢件、薄铜件或薄黄铜件，焊接效果很好，但其强度比铜焊、铆焊或焊接要低得多。这些连接金属的方法通常用于高强度的永久性接合。,焊 接,谢谢观赏,www.sciencep.com,Thank You !,