The switch is rated for 15A so I figured I couldn't go wrong. kyriakos on 5th May 2014 Dear Ian Thank you very much for your prompt and really c o m p l e t e from any aspect response. They are rated to 120A continuous or 480A peak current each, so blowing them up is fairly unlikely. Commercial CD Spot Welders are very expensive (thousands of dollars), but it is possible to build your own for far less.

Heat is not as big of an issue as I thought. Thanks very much Kyriakos, kyriacos on 4th May 2014 Correction: The 6 Maxwel capacitor are connected in series not in parallel. I suspect that the t h r e e IRFBs are not sufficient to give a hotter pulse.

Spot welding makes use of the phenomenon of Resistance welding; Resistance welding is the joining of metals by applying pressure and passing electrical current for a length of time through the metal area which is to be joined, creating a strong & focused weld nugget.
All I can find is standard gauge wire, so I may as well but a second hand arc welder. I have eight BCAP1500 P270 Maxwell Ultracapacitors! Please use caution as this device is not a toy.

4 cable could be substituted for each No. Incredible blog. I don't have a bill of materials for the build because it was just a one-off.

Otherwise check out Ebay surplus hockey-puck SCR and stay easily within ratings. Don't use the switch in these boxes as they are not rated for 15A.

This is a light duty welder for thin metal. I lucked out and found a 4 foot piece of grounding wire.

I looked at some other plans on the Internet but they all seemed to require something I didn't already have. Thicker than that and I can offer no promises. You will be able to get all the welding repairs completed and marked off your to-do list with this small and powerful spot welder. Interesting that you got better results with just 0.2F capacitance! Ian Hooper on 10th Jul 2013 Hi, most microcontrollers can only supply about 20mA from their output pins, which is enough to switch small / low power MOSFETs directly, but big MOSFETs have too large a gate charge and would end up turning on very slowly from only 20mA - which is quite inefficient and may damage the device when you're trying to turn on hundreds of amps. Umut on 11th Jan 2014 Great work Ian, thanks for your effort. Just ballpark figures but you get the idea. The double pulse this DIY spot welder generates better clamping ability and the current can be adjusted to suit the welding task. I know exactly when it is on. Usually less than half price and freeshipping. Cheap DIY Spot Welder Pulse controller on bread Board with a 555 and a MIC4452 driver. My capacitors can take up to 20V, but the IRFP2907 FETs I have allow an absolute maximum gate voltage of 20V. just a thought before i start . Also, I have a few thoughts to run by you. Note that TO220 packages aren't as beefy as TO247s (smaller package, smaller legs etc) so you'd probably need half again as many for the same power handling. 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. I have seen a huge decline in electronics hobbyist in past…, Schematic_Spot-welder_Sheet-1_20190302212716.pdf, Inchworm Robot - Modular, Move Allsides With BT App, 3D Printed Arduino Powered Quadruped Robot. SAFETY NOTICE: PC power supplies contain large capacitors that can store energy for a considerable amount of time (days). A piece of thin plywood to seal in the remaining side. Using welding gloves should protect you from both dangers. The box can be modified with tin snips if you take your time. A DIY pole barn is the ideal choice for any homestead because it is adaptable …, Your email address will not be published. 5) Secure the metal piece to be welded by using a welding stand with alligator clips & place them on top of each other so that they are in contact with each other. 2) Make a hole on the cap of the empty plastic bottle & connect the end of the wires to a 2-terminal rail connector through the cap of the bottle. I worry what would happen if my timer circuit failed and the capacitors discharged completely! Go to Home Depot and take a wiring work shop or something.

You will need the following parts to build this project. I see a noisless small spark comming from the six maxwells.

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