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Homemade Spot Welder
Nicely done.. BTW guitar builders use a baby version of this idea to bend fret wire to match the radius of a guitar neck's fingerboard.
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Quick safety question. I have rewrapped the secondary of my mot with 2/0 with only a couple turns so I'm getting 2.5 v out. So at 12 amps in at 120 I have the potential of 575 amps out. So I'm just a tab bit nervous about holding the thing I want to spot weld....Even though I realize at 2.5 v it'd have a pretty hard time of poking me. You guys have had no problems?
Ok thanks for the quick reply!
https://en.wikipedia.org/wiki/Electric_shock#Facto...Read about the dangers here. It sounds like you need at least 42 volts unless you are attaching it directly to your heart tissue. I've never felt even the slightest shock from my welder. Burns are the greater danger. Using welding gloves should protect you from both dangers.
Sorry, I know it's a late reply, but there might be someone else interested in this as well so here goes, anyone feel free to correct me if I get it a little wrong.The workpiece acts as a resistor, it's not a very strong resistor (low ohms in other words) which is good because that allows more amperage to flow through and melt the metal more effectively. In addition, your primary has a different impedance to dc and ac, and with ac it has a different impedance if the secondary is open vs the secondary in contact with metal to be welded. Your multimeter measures resistance by putting an electrical current through the coil.Electrical energy is only generated in a conductor when a magnetic field changes within close proximity to said conductor. Since the primary windings act as an electromagnet, that means energy is only transmitted through a transformer when the magnetic field is generated or collapses, this doesn't happen with direct current like in your multimeter, so your multimeter only reads the short circuit resistance or dc resistance of the coil, whereas if you measured the resistance to alternating current, you'd notice that the impedance would change depending upon the resistance and winding of the secondary coil.
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