#Spot welder build

The creator ‘teaches you welders’: first a JX-D99 welder board (a toy) + welding pens, hooked to a battery, five MOSFETs underneath; it felt underpowered so he added MOSFETs at the back, and after a dozen or so welds it blew; bought another and it still didn’t feel up to it; then switched to an AWithZ welder, model UF20B, 1750A, 5000W instantaneous (nameplate: 6.0V MAX, 1750A MAX, 10.5kW MAX, 100–240V, Shenzhen Juequi Technology); test-welded two pieces of 0.1-thick nickel strip — welds very good, bright and clean. Comments: ‘so the conclusion is you bought a welder for a few hundred bucks’, ‘you’re teaching us to buy a welder’, ‘talked into buying yet another one’; someone says Xiaoqiang’s can reach 2500+; someone claims a 5-MOSFET board with a 4S 120C battery at gear 75 can weld 0.1 nickel stacked on 0.5 copper (creator: no way).

A sudden idea: lots of lamps to wire up, and buying a connector every time adds up, so can the spot welder weld nickel strip straight onto the lamp (the bulb’s metal base), bent into an arc as a wire terminal? Try it: one shot and it’s on, very solid — he yanked the cap on the bottom clean off and the weld didn’t let go; on the side it sticks with one shot; a bit hard to hold down, need something to brace it; one spot wasn’t pressed tight and simply got burned through — which shows it can weld thicker than this, not just this thin; the current setting is on the strong side, for thin stuff turn it down, and at a really strong setting it could probably weld a stainless-steel frame, next episode; the spot welder is great fun and can be turned to all sorts of uses; a bit of tape for insulation and you can make a lamp that hangs from the ceiling, extremely sturdy. Comments: it works but for safety a lamp holder is more reliable, safety first, convenience second (4); asking for trouble, relying on insulation tape?; you’re not an electrician, is this just an ad; which model; if both tips touch your hand at once do you get a shock; I have the top-spec one too.