i have the notes from your site. i just dont get what the notes say
and this has a what new welders have " max current ,start current >
,weld frequency ,end current ,pulse frequency and gas on and off
time ,duty cycle ... the one that did it up used cmos, ttl
chips.. first time doing something with this many amps so you can
see why i need the help i > dont whant to blow up the igbts would
it be safe to put them in to the circuit for now or should i > take
out some stuff and should i use film caps on the driver board the
data sheet for the IR2110 on what type of cap should be used as to
film or ceramic cap for the 470nf=.47uf and the 1nf=.001uf
would ac film suppression caps work for the out put to kill the spikes
????
and for the rest should i use polyester film caps i have been looking
at wima caps ????
You have not stated many details about your project, and it is just
about time.
Are you trying to make a inverter welder? Are you redoing an existing
welder? What do you want to accomplish?
The first thing that I must say is that if you have the brains and
skills necessary to figure out how to make such a welder from scratch,
you would be better off buying a brand new Miller welder for several
thousands of $$ and using your skills to make money elsewhere. That
said, if you like to have fun inventing stuff, there is nothing wrong
with it.
So... You need to give some details of where you are and what are your
intentions.
I think that I would do this work in stages, not least because you
would be learning as you go, moving from one working prototype to the
next. Rather than assembling some contraption that surely would not
work, and then realizing that you forgot something at earlier stages
that cannot be easily corrected.
That's a computer programmer's approach.
The first stage would be to make a DC power source with no bells and
whistles. (that itself is a big task). Just a basic stick welder.
If you get here, it would already be a huge accomplishment and you
would be able to do a lot of real life welding with that.
If you get thus far, a sensible next step would be to make a high
frequency arc starter. (could be easier to just buy one, a respectable
choice)
Then, you can move on to make a basic TIG welder, with a two stage
pedal (one stage for gas control, another for turning on arc).
The last step, the inverter, is very independent from everything else
and can be done much later. And can be skipped altogether.
Really, most real life welding can be done without the inverter.
i
