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Old 7th Aug 2018, 6:47 am   #32
FrankB
Heptode
 
Join Date: Oct 2005
Location: Olympia, Washington, USA.
Posts: 663
Default Re: Battery tag spot welder.

This is a great DIY project. A great job!

I repaired MWO's for about 20 years. The transformers are great for projects like this.

Of note: Some put the primary on the outside and the secondary on the inside of the windings. Makes it a pain , and best to find another tx.

If you manage to find an original, old commercial Raytheon MWO transformer- its worth its weight in gold. they are huge and put out mass current. (Also make a great PS transformer for a hi power CW rig.).

If you get one that has welded laminations, a grinder is the way to go. Sometimes I'd luck out and get ones with just bolted laminations. The cats pajamas to disassemble!

The newest ones use an SMPS and are good for little but a few parts. Just heft the oven to tell if its got real iron in it or not.


I might consider using a car starter solenoid or relay, since I have a box of them, but a solid state one is likely the best way to go, as you did.
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