With Instructables you can share what you make with the world, and tap into an ever-growing community of creative experts.
We have a be nice comment policy. Please be positive and constructive.
We noticed you attached photosto your comment.
I made one from an old microwave transformer a few years ago. Works well, 4V about 100A i'd say.
Some background. FYI this is super dangerous and basically shouldn't be done by anyone. Ever.
Microwave transformers massively up the voltage (i.e. secondary:primary coil ratio is a high number) so we actually change where we apply 240VAC to what was the secondary coil.
Then we replace the primary windings with some super thick earthing wire (about 6mm2 - ish) I only did 4 windings as i wanted 4V, i.e. wanted about a 60:1 (primary:secondary) ratio
Then put a 240V switch on the primary coil side (what was originally the secondary) and used some plywood to hold it together and some copper pipe for the welding surfaces.
I was pretty scared to turn this bad boy on originally but it worked a treat.
Wouldn't advise it following my lead but i had a good time making it
Hello Mr. Lopez. I am interested in building a welder like yours. May I know what kind of transformer you used. Regards from Japan, Ray
Repairing Solar Cells
Repair your remote controls
150 Amp Motomaster Battery Charger Fan Controller Diagnosis and Repair
Upgrade your dead cordless phone
Samsung Tab 7 7 will not turn on Battery Replacement
Makita 18v LXT Lithium-ion Battery Repair
High Voltage Fun
Roomba 415 Battery Teardown
How to repair remote control
Repairing car remote keyfob with Sugru
Posted:Jan 14, 2011
Join 2 million + to receive instant inspiration in your inbox.
Download our apps!
© 2015 Autodesk, Inc.
By clicking "Create Account" you are indicating that you have read and agree to the Terms of service.
Already a member? Login »
Enter the email associated with your account and we will send you your username and a temporary password.
Not a member? Sign Up »
Want to go pro?
First step is to sign up.
By clicking "Sign me up!" you are indicating that you have read and agree to the Terms of service.