论文部分内容阅读
一、概述在第二次世界大战期间,美国将焊接生产技术引入了造船工业,同时也带来了大量船体结构的脆性断裂。此后,世界各国相继发生了许多大型焊接结构的断裂事故。由于这些事故造成了巨大损失,促进了焊接工作者对形成焊接接头冶金过程及其对结构使用性能影响的深入研究。焊接是一种特殊的冶金再熔炼过程,由于焊接热源作用的集中性和瞬时性,使得在体积不大的焊接区内经历了几乎所有的冶金反应,致使整个焊缝及热影响区内存在着很大的
I. Overview During the Second World War, the United States introduced welding production technology into the shipbuilding industry, but also brought about a large number of brittle fractures in hull structures. Since then, many countries in the world have occurred in many large-scale welded structure of the fracture accident. As a result of these accidents, great losses have been caused, which has promoted the further research of the welding workers on the metallurgical process of forming welded joint and its influence on the structural performance. Welding is a special metallurgical remelting process. Due to the concentration and instantaneous effect of the welding heat source, almost all the metallurgical reactions in the small welding area lead to the existence of the entire weld and the heat affected zone very big