This spot welding pen connects to your spot welder (I use kWeld) which connects to a large 12 volt battery or any other 12 volt battery. battery pack. From time to time it is necessary to touch up the tips of the electrodes (approx. every 100 welds). Slightly rounded tip geometry. For 18650 batteries, you will also need to bend the electrodes closer together. See image. Highly recommended.
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