Sunkko spot welder is one kind of Resistance Spot Welder, nickel sheet and battery are held together under pressure exerted by two shaped copper alloy electrodes. Typically the nickel sheet is in the 0.05 to 0.35 mm (0.002 to 0.14 in) thickness range. The two copper electrodes forcing a large current through two small spots, and the spots will melt the nickel sheet onto a battery. The attractive feature of sunkko welders is that a lot of energy can be delivered to the spots in a very short time (each energy release lasts 0 to 5 milliseconds.). Spot welding can keep the battery from getting too hot, as might happen if conventional soldering were done.

The amount of energy delivered to the spots is determined by the pulse and current level settings. In this article, we will talk about how these settings work?

All sunkko welders are powered by alternating current(AC), and the usual waveform of alternating current in most electric power circuits is a sine wave, whose positive half-period corresponds with positive direction of the current and vice versa. We split each half-period wave into 200 equidistant intervals. Check figure 1 below:

The picture above is a 50 Hertz sine wave in a 220 voltage power system, which means that a single sine wave is 20 milliseconds. When you set the current level to 99 (The peak represents the maximum value of the adjustable current level, some model may be  8.), and the pulse quantity to 1, the welder draws "energy 1" from the power system. "energy 1" and "energy 2" will be drawn both when the pulse quantity is set to 2.

As the current level decreases, the amount of energy represented by a single shaded portion is also reduced. The lower the current level, the smaller the energy. (figure 2)

Thank you for reading this blog, and this is almost the whole content of sunkko current and pulse settings. One last tip for sunkko users, the sunkko spot welder relies on a stable sine wave power circuit for proper operation. Power affected by a electromagnetic interference will affect the spot welding performance of the sunkko spot welder.