Old 01-21-17, 04:16 PM
Thread Starter
Join Date: Jan 2017
Location: United States
Posts: 3
Received 1 Vote on 1 Post
Question Transformers

I'm making a welder from microwave transformers all videos only use two.can I use three to have more power will this pop the fuse and if so will making it a 220v help
Sponsored Links
Old 01-21-17, 04:39 PM
Join Date: May 2015
Location: USA
Posts: 3,138
Received 1 Vote on 1 Post
I assume you are rewinding the secondaries to be suitable for a welder.

I think you will find trying to run three off one 20 amp 120 volt circuit will pop the breaker as soon as you strike an arc. You can put two primaries in series and run off 240, but you would have to use four (2 sets of 2) in order to go beyond 2.

When you are getting to that point, certainly you would be better off buying a used old welder off craigs list or from Harbor Freight. The cost of the heavy gauge square copper for the secondaries along will start to add up.
Old 01-21-17, 09:49 PM
Thread Starter
Join Date: Jan 2017
Location: United States
Posts: 3
Received 1 Vote on 1 Post
120/240 house

Since I have two transformers if I make sure each one is on a different 120 breaker would that be equal to 240...easier than installing a new line of 240

If I did have a 240 line and 2 transformers of 120 in series would it make windings read different or will each see 120v
Old 01-21-17, 10:27 PM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Northern NJ - USA
Posts: 53,525
Received 408 Votes on 384 Posts
The transformers need to be in phase. Technically you could put them in series across a 240v line but if the transformer aren't identical there may be unpredictable results.

I think I'd try to keep the transformers together on one 20A 120v circuit.

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Thread Tools
Search this Thread
Display Modes
Ask a Question
Question Title:
Your question will be posted in: