Reddit reviews SUNKKO Pulse Spot Welder 788H 18650 battery Welding Machine with LED Battery Testing and Charging Function
We found 1 Reddit comments about SUNKKO Pulse Spot Welder 788H 18650 battery Welding Machine with LED Battery Testing and Charging Function. Here are the top ones, ranked by their Reddit score.
APPLICATION: suitable for welding 0.05 - 0.2 mm nickel plated steel strips (0.05 - 0.15 mm pure nickel strip); work with 18650, 14500 battery, etc;FUNCTION: spot welding, battery testing and battery charging;WELDING CONTROL METHOD: welding by pushing the welding head up or controlling by foot pedal;SHIPPING: The spot welder is sent from our Ohio or Nevada warehouse with an estimated shipping time of 2 ~ 4 business days, though expedited shipping is available. We will send you a tracking number after the item ships.
The (welder they had is this one)[SUNKKO Pulse Spot Welder 788H 18650 battery Welding Machine with LED Battery Testing and Charging Function https://www.amazon.com/dp/B01MF8LKYK/ref=cm_sw_r_cp_apa_i_Sof6Cb2C3DYFB] which is based on just a big transformer. You can set the "power" but I think this just adjusts how many mains cycles the thyrister latches on for keeping the transformer powered for more than half a dozen half cycles will kick the circuit breaker. The thing also often overheated when doing all the welding without any break to let it cool down.so one improvement would be to add a cooling fan and expoy a heatsink to the core. I am guessing it overheats due to poor design and core saturation to get the power density into a small transformer.
The electrodes were copper based, and we set the "power" close to the maximum as well as the pressure. Copper spot welding did not work at all. Nickel (0.2mm) just barely worked.
I built a much smaller 3S4P pack for my quadcopter, totalling 8AH and it worked great for a short while, but with flight times not much longer than the previous 4.5AH 3S pack that weighed half as much. Not sure if this was due to the weight or diminished capacity of the decade old cells. The quad suddenly lost power mid-flight and dropped like a brick. Besides some overall sluggishness which I assumed was the result of changing flight modes from normal to GPS assisted, I did not notice a significant loss in performance prior to total loss of power, it all happened so fast. Later investigation revealed some cells were still fully charged >4V while others were down to 3.85-3.9V. Further, that many spot welds were broke following the crash. I suspect at least one of my welds were bad and failed, causing excessive stress on the remaining cells. It may have triggered the PTC cutoff inside the cells which cut power to the craft. I lost a few cells in a thermal runaway following the disaster and had to let them fizzle out on the pavement before disposing of them.