一、前言 旋转电弧焊是根据“磁场中的载流导体将受到力地作用”的基本原理,利用一个外加的、垂直于焊接电流的驱动磁场,推动电弧沿工件端面间隙(称为电弧间隙)高速旋转,从而使端面均匀加热到熔化,然后加压顶锻而焊在一起的一种焊接方法(见图1)。它适用于焊接管-管、管-法兰盘、空心轴等具有封闭截面的空心零件,是一种优质、高 I. INTRODUCTION Rotary arc welding is based on the basic principle of “the current-carrying conductor in a magnetic field will be subjected to force” and uses an applied magnetic field perpendicular to the welding current to push the arc along the workpiece end gap (called the arc gap) A high-speed rotation, so that the end face is heated evenly to melt, and then pressed together forging a welding method (see Figure 1). It is suitable for welded pipe - pipe, tube - flange, hollow shaft and other closed parts with hollow parts, is a high quality, high