窄间隙埋弧焊的坡口断面面积大约是普通埋弧焊的一半,这种焊法可以大大提高焊接效率并节省焊接材料。板材越厚,高效率的特点就越显著。因此,随着焊件厚度的不断增加,采用窄间隙埋弧焊越来越具有重要的意义。普通埋弧焊的间隙过窄时,不易脱渣,所以不适于进行窄间隙焊。近年来,国外对窄间隙埋弧焊进行了积极的研究,如西德用窄间隙埋弧焊法焊接了大型 Narrow gap submerged arc welding groove section area is about half of ordinary submerged arc welding, this welding method can greatly improve the welding efficiency and save the welding material. The thicker the board, the more efficient the features are. Therefore, with the increasing thickness of weldment, the use of narrow gap submerged arc welding is more and more important. Common submerged arc welding gap is too narrow, not easy to slag, it is not suitable for narrow gap welding. In recent years, foreign narrow-gap SAW conducted a positive study, such as the West Germany narrow gap submerged arc welding of large