本文介绍了采用石墨纸通以电流时测量电位场的方法,模拟了焊接时焊件的电位场分布规律。采用直接控制电弧相对焊缝坐标的自动跟踪方法,研究了焊接电弧和测量点的相互坐标关系。同时,介绍了焊接位置偏差的移动检测法和固定检测法。这种自动跟踪方法适用于不开坡口,不留间隙对接缝的焊接。 This paper introduces the method of measuring the potential field when using graphite paper to pass the current, and simulates the distribution law of the potential field of the weldment when welding. The automatic tracking method which directly controls the arc relative welding seam coordinate is used to study the mutual coordinate relationship between the welding arc and the measuring point. At the same time, the movement detection method and fixed detection method of welding position deviation are introduced. This automatic tracking method is suitable for not groove, leaving no gap on the seam welding.