一、概述窄间隙埋弧焊是在常规埋弧焊的基础上发展起来的一项新技术,由于它利用了窄间隙焊的优点,弥补了一般埋弧焊输入热量太大的不足,所以,成为具有生产效率高、焊接质量好、变形小、成本低的一项焊接新技术。近年来,随着化工、炼油、核电站等工业对厚壁压力容器的要求,窄间隙埋弧焊已得到了迅速发展,目前已成为焊接大厚度构件最有效的方法。下 First, an overview Narrow gap submerged arc welding is a new technology developed on the basis of conventional submerged arc welding, because it uses the advantages of narrow gap welding to make up for the general submerged arc welding heat input is too large, therefore, To become a production of high efficiency, good welding quality, small deformation, low cost of a new welding technology. In recent years, narrow-gap submerged arc welding has developed rapidly with the requirements of thick-walled pressure vessels in industries such as chemical industry, oil refining and nuclear power plants, and has become the most effective method for welding large-thickness components. under