-Greg, issam on 23rd Jun 2013 Hello ian I found the project very interesting microt spot welder, and thank you for sharing your information with everyone, I try to realize the same project I pocede capacity of 333 military farad 25 v, I put 4 mosfet IRF kind 3205 to control the discharge, I notice qund I load my capacity to burn the mosfet 25v, I c not for what reason, At the beginning I try to charge the capacitor has SEVERAL value 12 v 15 v ac and give a result that is satisfesant, but I still do not understand why the mosfet is destroyed quickly noticed that the last mosfet connected to ground him that c will burn quickly, and thank you for all. Concentrate the voltage as you say. John on 24th Mar 2013 Hi! But possibly better for CD welders would be ones like IRFP4468 or IRFP4368 for the higher current rating and lower on-resistance. You have done agreat job. Can you use this to spot weld thin copper sheet to brass or copper copp and brass brass? Sheet metal work is about the most you can expect. meguit@rist on 10th Jul 2013 will a IR2183 acceptable for the gate driver? Would love to see more shots showing how everything is mounted! Thanks! I expect you'd need a lot more power to weld 0.5mm material! It's a bit of a waste of power while running, but avoids any surprises lest you come back a day later and the capacitors are still charged. Spot welder series configuration. 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. This page gets a fair few visitors so it has been on my "To Do" list to design a better CD spot welder from all that I've learned since - perhaps something that could be offered as an inexpensive kit containing PCBs and busbars to make it easier for others to try building..) Anyway good luck with your build! I did everything else making sure that the bolts continued to meet when the jaws close. All DIY projects are meant to save you money and/or recycle useful objects and an arduino spot welder is no exception. I have read that the spot weld itself needs about 200 joules - not sure if that's per spot or for a pair, but at any rate it's clear that the equipment is soaking up most of the energy rather than delivering it to the weld. Three strands of No. DIY Capacitive Discharge Battery Spot Welder. $6.52 each via RS Components (Allied Electronics) here in the states. The box also provides a good (safe) place to connect the plug and all the wires. Another reason I prefer the idea of only having a single pulse worth of energy in capacitors, instead of having to close the floodgates as well.. Portlablepowerman on 21st Jun 2013 Hello again Ian, I got everything together, and is looking good except the fet's I chose were IRL7833. Build your own arc welder! I suspect that the t h r e e IRFBs are not sufficient to give a hotter pulse. Fixing/upgrading it was quite a learning experienced, speckled with several other blown MOSFETs. 10 ms single pulse adjusted with oscilloscope. Fully Discharge the capacitor after every weld. If you want to create this spot welder you can download the plans to go along with the YouTube video. Anyone can build this simple to use light duty spot welder. That will give you around 1,6uF at 16V. Use the transformer from a non-functioning microwave and a few other components to create this powerful small spot welder. You might still need 10V to get the current flow but probably a much smaller charge/capacitance for a smaller weld. I'm just not sure why. This is the main reason that such a thick piece of wire is used. Ian Hooper on 17th Jun 2013 Yeah the two builds which inspired mine (Robert Thompson and Philip Pemberton, links at the top) both used audio caps. Don't use the switch in these boxes as they are not rated for 15A. They provide a strong weld & are easy to build with a small number of components. Failing as a short is a common failure mode, but I think if your circuit is working right and you're operating within the MOSFET specs, there should be no need to add redundancy. Why pay over $100 for an arduino spot welder when you can just make one of these for a fraction of the cost? Phoebus Sparos on 30th May 2013 For what kind of weld spots do you use this?

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