Gallery, Projects and General > The Design Shop
Microwave owen transformer spot welder?
PekkaNF:
Quick measurement shows core cross section area of 22cm2, which quick&dirty formula says would produce 470 VA of power....
On spot welder dirty deeds done dirt cheap....what voltage (vs. amps) I should coax it, before something starts to smell?
Pekka
John Rudd:
Pekka,
A few links to try....
http://www.giangrandi.ch/electronics/trafo/trafo.shtml
http://sound.westhost.com/articles/xfmr3.htm#s3.0
In the last link, at the bottom of the page are some zip files containing various calcs/spreadsheets/data....
PekkaNF:
Looks like they are geared of designing continuous power. I'm trying squese every little red hot electron trough it max. two seconds....but if core saturates a lot of fireworks can happen in two seconds :zap:
Pekka
Noitoen:
The little piece of metal core between the windings act as a current reducer. Removing them increases the output current.
Fergus OMore:
I had a spot welder for years to go with my then selection of other welding tackle. It was all sold on my present move but I bought a cheap scrap MIG for the hell of it. In another forum there was guy from Oz who had built much the same thing but principally the arms etc were wood. Nevertheless, it was a fair idea for intermittent use. His arms went on fire.
I thought that there was a simpler and more reliable tool in a £40 arc welder and coupled with another £10 or so for a copper earthing rod, it was all quite practical using scrap 1" square arms from an old table set of legs.
I'll let you know when I have time from doing a massive probate job following the death of my wife who had-- would you believe- a turret ( 4 heads)spot welder for orthodontic stainless steel band and wires.
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