Welding circuit, resistance of electrode/work

Thread Starter

Chefslot

Joined Sep 24, 2018
16
Trying to work out a basic transformer circuit on Falstad. A simple AC to DC then an inductor/choke. Looking to work out the heneries but the load is what is confusing me, what would it be? So far, got 240v going in, shunt transformer say 90amps, where would I go from here?
Regards
 

crutschow

Joined Mar 14, 2008
23,484
An are has a very low resistance after breakdown. similar to a Zener.
The arc current must be limited by some type of current-limit circuit.
In a welder, I believe this is done with some sort of saturable reactor.
 

Thread Starter

Chefslot

Joined Sep 24, 2018
16
An are has a very low resistance after breakdown. similar to a Zener.
The arc current must be limited by some type of current-limit circuit.
In a welder, I believe this is done with some sort of saturable reactor.
All I know as a rule of thumb, cc is done with a adjustable shunt, smaw and Tig, where MIG is CV with capacitors. Until you get to the complexities of inverters. My project is just a old arc smaw transformer.
I'm not looking for a perfect DC wave form, I'm going to get ripple, as long as amps dont go down to 0, then life is happy.
Funny how ripple has been turned into pulse, from a bad to a good trait.
 
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