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在锅炉、压力容器的生产中,广泛采用埋弧自动焊方法进行焊接。这种焊接工艺具有生产率高、焊缝质量好等优点,但该法属于盲焊,焊工无法直观从正面看到熔池的准确位置。而且由于工件加工的尺寸形状误差、工件焊接过程中的自身热变形,再加上工件拖动系统(即变位机)传动或安装猜度诸方向的因素综合作用,故而在筒形结构的环缝焊接时,极其普遍地存在着垂直于焊缝方向上的轴向串动。为了防止焊偏,焊接时,焊工只好在接头背面进行观察,并进行人工调整,操作既不方便也不精确,因此,不能有效地保证接头
In the boiler, pressure vessel production, the widespread use of submerged arc welding method for welding. This welding process has the advantages of high productivity and good weld quality, but the method belongs to the blind welding, the welder can not directly see the exact location of the molten pool from the front. But also due to the size of the workpiece shape and shape error, the workpiece during the welding of their own thermal deformation, coupled with the workpiece drag system (ie, variable displacement drive) or installation of the guessing factors in all directions, the combined effect of the cylindrical structure in the seam When welding, it is extremely common to have axial strikes perpendicular to the direction of the weld. In order to prevent welding deviation, welding, the welder had to observe the back of the connector, and manual adjustment, the operation is neither convenient nor accurate, therefore, can not effectively ensure the connector