Picture of Making an ARC Welder - Part 1 of 2
How to convert scavenged microwave parts into a useful arc welding machine.  This is part 1 of 2, and focuses on the modification of the transformers.


Step 1: Watch the Video!

WARNING: Stick welding, and/or the modification of a Microwave Oven Transformer (M.O.T), can be very dangerous and presents risks of UV radiation, shock hazards, burns, fires, fumes and a multitude of other risks.  This project should not be attempted without a thorough understanding of electricity, adult supervision and adequate training.  Misuse, or careless use, of tools or projects may result in serious injury and/or death.  Use of this content is at your own risk.
gennagonna1 year ago

I have been saving bottle caps

Great Videos ! I'm going to build my own. One last thing : With two MOTs, how to calculate the width, the lenght and the turns to obtain a 30V and 0 120 Amps welder? you say 8 gauge with 18 turns, but if i have a different first coil, would it be the same? Best regards from France
sibi.20092 years ago
Sir how much is the output current from this transformer ?
Grant have you posted part 2 ?
walkerbk2 years ago
Have you posted part two? and this runs on 240 volts??? nice build
iungerich12 years ago
hay grant already made your spot welder and i love it!
when part 2 comes out i will make this but i am getting all of the stuff now
i have 2 wire choices picked out witch one (if any) do your think will be best?



thanks hope you can answer my question
MrPyr0fiRe2 years ago
I am from Germany and I will build this ARC WELDER too.
is this the right cabel

are you going to make a video of the dual MOT stack i saw in your video?
Thanks for asking. I wasn't planning on it. It was just unballasted on 240 volts and I'm guessing it was pulling around 20-30 amps, but not enough to pop the breaker .. even after running for 10+ seconds at a time.
You should make a video. I made I dual stack with a half-resonant circuit (2 microwave capacitors in series) and it gave me arcs about a foot long!!!
wolfgang642 years ago
Grant, great work! I have built your spot welder and have been very impressed.
I have two questions with this one. 1 how small can you take this and can you use this on other metals? You are an impressive tinkerer.
I_StarkGuy2 years ago
You are so awesome!!! And your videos are clear and professional. I will follow you to see your recent videos. I'm planning of repeating some of your projects myself.
The King of Random (author)  I_StarkGuy2 years ago
Thank you very much!
M.C. Langer2 years ago
Amazing Grant! I am eager for the second part!!!! :-)
The King of Random (author)  M.C. Langer2 years ago
Great! I'll have it up in about 2 weeks :D