Member postings for ERMD GREFF

Here is a list of all the postings ERMD GREFF has made in our forums. Click on a thread name to jump to the thread.

13/04/2020 21:52:02

I just made a spot welder and had trouble making good welds, I tried more turns and then used two microwave transformers
with the primary's in parallel and even more turns on the secondary's with only a little better welds. One of my main problems was I was trying to
use some smaller diameter wire i got for free in the secondary and was trying to increase voltage to get more power. I ended up buying the biggest diameter wire that I could fit into the transformer. with a total of 3turns on the 2 transformers I then had a new problem, I had to much power I made a little timer circuit to set the on time of the spot welder and now I can weld 0.2mm nickle to the POS side of the A123 battery in just under 100mS or less and the welds are bloody strong. I had a quick play using Tungsten for the electrodes but they just lighted up like a light bulb so went back to copper.

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