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  • lagman67 commented on KaeptnBalu's instructable DIY Arduino Battery Spot Welder3 months ago
    DIY Arduino Battery Spot Welder

    Thanks a lot to KaeptnBalu for the instructable.I finally managed to assemble my spot welder. I kept wire length very short (less than 30cm total, so 60cm of total wire for positive and negative wires).However I used a pair of 14AWG wires for each side to keep the thing light and flexible.My spot welder never really worked. If I use a weak battery as input, it works as expected. However if I use an automotive battery as input, each time I make a weld the MOSFETs die (at least a pair). They die in the way that they short (Drain, Source and Gate are all shorted) and this causes some very big sparks at my tips when it happens.If I replace the defective pair, it works again as the first time.I thought it must be an inductance problem so I installed protection diodes as mentioned below, and ...see more »Thanks a lot to KaeptnBalu for the instructable.I finally managed to assemble my spot welder. I kept wire length very short (less than 30cm total, so 60cm of total wire for positive and negative wires).However I used a pair of 14AWG wires for each side to keep the thing light and flexible.My spot welder never really worked. If I use a weak battery as input, it works as expected. However if I use an automotive battery as input, each time I make a weld the MOSFETs die (at least a pair). They die in the way that they short (Drain, Source and Gate are all shorted) and this causes some very big sparks at my tips when it happens.If I replace the defective pair, it works again as the first time.I thought it must be an inductance problem so I installed protection diodes as mentioned below, and I don't see any voltage spikes anymore (25V max and -10V min).So I really don't understand why the MOSFETs still short. Any idea?Thanks again!

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  • lagman67 commented on KaeptnBalu's instructable DIY Arduino Battery Spot Welder3 months ago
    DIY Arduino Battery Spot Welder

    Quick question, the IRF1404 is cheaper and has a lower resistance. What would be the drawback of using the IRF1404 instead of the IRF1405? Thanks.

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  • lagman67 commented on KaeptnBalu's instructable DIY Arduino Battery Spot Welder4 months ago
    DIY Arduino Battery Spot Welder

    5 PCB left.Shipping is usually around 5€ for European countries (e.g. if you want two PCB, it will cost you about 15€ total).

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  • lagman67 commented on KaeptnBalu's instructable DIY Arduino Battery Spot Welder4 months ago
    DIY Arduino Battery Spot Welder

    I have some white uncut PCBs to sell. I am based in France.Price is 5€ for one PCB plus shipping.Please contact me via message.

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