一、前言近年来,窄间隙焊接工艺已开始应用于生产,但因焊机的自动化操作不完善,直接影响到它的推广使用。因此,除要了解焊炬在间隙中的自动对中以外,还需实现焊炬在焊接过程中的自动升降,才能保证焊缝质量。在环缝窄间隙焊接时,因工件的椭圆度而造成导电咀与工件之间的距离变化会达十几 I. Introduction In recent years, narrow gap welding process has begun to be used in production, but due to the imperfection of automatic operation of welding machine, it has a direct impact on the promotion and use of it. Therefore, in addition to understand the torch in the gap in the automatic alignment, the need to achieve automatic welding torch in the process of lifting, in order to ensure the quality of the weld. Narrow gap welding in the ring gap, due to the ovality of the workpiece caused by the conductive nozzle and the distance between the workpiece will reach more than a dozen