Resistance welder


#1

I am curious to try out the small prototype someone has built. Who owns it ?


#2

Afaik, VHS owns it.

Maybe @LoialOtter or @ninetynein know more about it?


#3

@JohnC built it actually


#4

@JayTheDude was the one testing it out most recently. I think he was re-winding the transformer on it. It’s VHS, go nuts. Don’t die.


#5

It was made by @JohnC many years ago, and only recently got unearthed. I
doubt he cares about it. Feel free to try it out (it doesn’t work) or fix
it. More windings on the secondary required, I think.


#6

Yeah, I am going to take it home today to work on it, as I have the needed copper wire.
@Rob let me know what your plans are, we could work on it together!


#7

Well, jaythedude never got back to me. But I’ve been thinking about another idea. How about using a SMPS , which are surely more plentiful than microwave oven transformers anyway. Change the voltage feedback sense resister, Couple of fatter output capacitors, how hard could it be ?

I wonder if there’s a few old AT power supplies already kicking around the hackspace already ?


#8

Haha, what!

Dude, I thought you were going to get back to me! :slight_smile:


#9

And yes there ar quite a few ATX Hanging around


#10

So did you wire up the secondary ? How did it work ?


#11

I’m still working on it, I’m in the middle of rewinding it. My prognosis is that it is not powerful enough to arc weld therefore it needs a second transformer. At the moment it can melt through 0.5 inch nails, which is pretty cool!

I have read a few articles on the web and they all say it needs to transformers

Btw it is better to message me on slack, I’ll respond much quicker!


#12

Sorry, I don’t have access to slack.
I suspect there’s probably little advantage to spot welding over pop rivets unlessyour doing production or just arc welding some half inch nails or whatever you said.
BTW, I googled your name and there’s a lawyer who practices administrative law in Vancouver.IS that a coincidence or are you that lawyer ?

Anyway, let me know if you need any help or parts/material. I would be interested to try it out.

Rob


#13

The is a good guide to protective glasses and shields.

Working many years on a farm I used class 1, eye glasses which were my
regular glasses with impact resistant lenses. These were sporting eye
glasses, but not squash glasses. And only used class 2 glasses for
grinding, and metal / concrete work.

I don’t see carpenters wearing class 2 glasses, have you?


#14

I have started using class 2a eye protection as I find the dust in the air is bothering my eyes when using a class 1, and I have occasionally ended up with dirt/sweat in my eye causing a safety issue while operating power tools. The one drawback is they fog up fairly frequently, I just use it as an indicator that I need to take a short break.


#15

Dust is a good point.


#16

Thanks for posting the link, good information there about welding glare protection.
Curiously though there is no darkness number vs current level recommended for spot welding.


#17

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