近年来,我国锅炉与化工设备中大量采用纵向和横向鳍片管。图1表示用高频电阻焊焊接纵向鳍片管的示意图。图中的“加热三角形”6就是高频焊的热源。高频电流从触脚4进入扁钢到达三角形顶点沿着管子侧面回到另 In recent years, a large number of vertical and horizontal fin tubes have been used in boilers and chemical equipment in our country. Figure 1 shows a schematic view of a longitudinal fin tube welded by high frequency resistance welding. The figure “heating triangle” 6 is a high-frequency welding heat source. High-frequency current from the pin 4 into the flat steel reaches the apex of the triangle along the side of the pipe back to the other