On 10/20/2014 9:35 AM, rangerssuck wrote:

My MOT spotwelder:
http://www.mwdropbox.com/dropbox/MOT...rPrintable.pdf

Very nicely done.

A long time ago, I worked in a shop where the products were housed in deep-drawn steel cans. The covers were soldered in place with a big soldering iron. To open them for repairs, they were clamped between carbon blocks connected to a rather huge filament transformer.

I was wondering whether a similar setup could work for the OP, with the MOT clamped to the assembly near the braze area. Resistance, rather than induction heating.

Nice Job.
I built a single transformer 120V one for welding battery tabs.
Repeatability was horrible until I implemented a cycle counter
that turned on the SSR synchronously at zero crossing and did full
multiple cycles of AC. Solved the core saturation issues too.
Takes about six cycles to weld a battery tab.