70 Amp MOT Stick Welder

**DIYer** · May 22, 2015, 02:29 AM

Cool build! Thanks for the share.

**piloon** · Jun 27, 2019, 07:47 PM

Originally Posted by DIYer

Cool build! Thanks for the share.

I also made a DIY welder some years ago.
The transformer that I found was easy to disassemble and the primary had 88 turns so I guessed that about 50 or so would do for the welding side.
I used 1/4 " copper tubing to wind my secondary 'welding side' .
I then poured varathane varnish to isolate the secondary.
Surprise! It worked just great.
From the rods that I used I determined that I was developing as much as the 5/16 rods demanded.
Made many DIY projects with that rig. (and nothing ever failed)
That ugly DIY welder was housed in a plywood box.
OK, today I use a nice Hobart 200 amp 'real' welder but the skills learned with my DIY still pay off.