Spot welding is the welding of weldments at individual points on the joint surface of the joint. Spot welding requires metal to have good plasticity. As shown in Figure 1, the simplest application is spot welding.
Figure 1 The simplest spot welding
When welding, the surface of the weldment is cleaned first, and then the welded plate is lapped and assembled, pressed between the two columnar copper electrodes, and pressed by P force, as shown in Fig. 2. When a large enough current is passed, a large amount of resistive heat is generated at the contact of the plate, and the metal in the hottest region of the center is quickly heated to a highly plastic or molten state to form a lenticular liquid molten pool. Continue to maintain the pressure P, disconnect the current, and after the metal cools, form a solder joint. As shown in Figure 3, it is a schematic view of a spot welder.
Figure 2 Spot welding process Figure 3 Spot welder
Because of the certain spacing between the solder joints, spot welding is only used for the welding of thin-plate lap joints without metal sealing, metal mesh, cross-reinforced steel structural parts, etc. If the columnar electrode is replaced by a disk-shaped electrode, the electrode is pressed against the weldment and rotated, and the weldment is continuously fed between the disk-shaped electrodes, and is energized in conjunction with the pulse. It is possible to form a continuous and overlapping solder joint to form a weld, which is seam welding. It is mainly used for welding of thin-plate lap joints with high sealing requirements or joint strength requirements, such as fuel tanks and water tanks.
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