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曲面板件缝焊时因滚轮与板件接触面积的变化，使各点散热情况和电流密度有所不同，造成熔核尺寸随板件曲率而变化。这种情况在油箱等容器的缝焊中会造成焊缝密封性差等问题。对此，提出了电阻缝焊逐点电流调幅的概念，即在板件弯曲处使焊接电流逐点均匀地变化，以补偿上述问题所造成的负面影响。主要从软件方面介绍了其实现方法，并对该法所焊试片进行了金相分析，说明了调幅效果。该方法已实现于ＫＦＸ３ 型缝焊控制箱。
Due to the change of the contact area between the roller and the plate when the seam welding of the curved plate is made, the heat dissipation and the current density at each point are different, causing the size of the nugget to vary with the curvature of the plate. This situation in the tank and other containers seam welding will result in poor weld sealing and other issues. In this regard, the concept of point-by-point current amplitude modulation of resistance seam welding is proposed, ie the welding current is uniformly varied point by point at the bend of the sheet metal to compensate for the negative effects caused by the above problems. Mainly from the software describes its implementation method, and the method of welding test piece metallographic analysis shows the effect of amplitude modulation. The method has been achieved in KFX 3 seam welding control box.