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  1. C

    18650 spot welding -how to- ULTIMATE REPOSITORY

    Ah, I like the Dremel idea. That has the added benefit of not increasing the overall width either.
  2. C

    18650 spot welding -how to- ULTIMATE REPOSITORY

    Okay, using two separate air-gapped pieces of nickel makes a huge difference. The tips don't stick, seem to leave far less material behind & the negative welds are now up to par with the positive, even at a slightly lower duration. Now the question is, does anybody know a reliable source for...
  3. C

    18650 spot welding -how to- ULTIMATE REPOSITORY

    If I want to buy additional electrodes, is there anything special about them or can I just buy generic copper rod in the correct diameter then sharpen with a file?
  4. C

    18650 spot welding -how to- ULTIMATE REPOSITORY

    That explanation makes perfect sense, thanks. On the topic of the probes wearing, I suspect I'm either doing something wrong or my probes are of particularly low quality because they seem to be wearing far faster than I assumed they would do. I figured a quick video showing exactly what's...
  5. C

    18650 spot welding -how to- ULTIMATE REPOSITORY

    Okay I've been doing some practice & beginning to get a feel for the settings. One issue I'm finding is that when I pull the nickel strip off to check the welds, sometimes it will only rip a hole at one point, not both. What might be causing this? How mindful should I be for how sharp/clean the...
  6. C

    18650 spot welding -how to- ULTIMATE REPOSITORY

    Right, I've now got my Sequre SQ-SW1 welder & a 5.5Ah 3S2P 140C LiPo to power it, along with 0.1, 0.2 & 0.3mm pure nickel strips. What can I use to practice/experiment welding the strip onto before starting on 'live' cells? Presumably I want a scrap of steel, but do I have to worry about its...
  7. C

    18650 spot welding -how to- ULTIMATE REPOSITORY

    Well the mashwb_qb welder I currently have can't handle more than 0.1mm pure nickel & can't handle stacking strips at all, so I will need a new welder regardless. I suppose the sensible thing to do would be to try 0.2x15 for a single series set & then hook it up to a dummy load while training my...
  8. C

    18650 spot welding -how to- ULTIMATE REPOSITORY

    My application is multirotor drones, which means a constant base load with occasional spikes, always with ample cooling from the drone's movement through the air (the battery is 'externally' mounted) & with flights lasting probably 10-12 minutes max. I would like to be able to pull 20A...
  9. C

    18650 spot welding -how to- ULTIMATE REPOSITORY

    With the kWeld currently unable to ship to the UK (confirmed by Frank this morning) what options do I have for building fairly high discharge 4S2P packs from INR21700-30T cells? I think I could probably get away with 0.2mm pure nickel but would be more comfortable with 0.3mm. What's out there...
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