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Homemade IGBT MIG welder with ATX PSU parts. [blown yet again][blown count: 5]
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xavier60:
I suspect that higher frequency makes the output choke unnecessary. I can't find the choke in the design  linked earlier.
And my old welders don't have a choke. The rectifier output pulses are 100KHz, I think it relies on lead inductance.
tautech:

--- Quote from: xavier60 on June 23, 2019, 01:55:37 am ---I suspect that higher frequency makes the output choke unnecessary. I can't find the choke in the design the I linked earlier.
And my old welders don't have a choke. The rectifier output pulses are 100KHz, I think it relies on lead inductance.

--- End quote ---
Chokes in MIGs are more common in single phase plain transformer types however an old 3 phase unit I had didn't have a choke at all.
Typically the cleaner the DC the better they weld.
james_s:
I get the distinct feeling that you have no idea just how difficult of a project this is going to be. Inverters require meticulous attention to detail, especially high powered inverters. One thing just slightly out from perfect and the whole thing goes bang in an instant.

If you want a welder just buy one, if you are on a budget you can buy used welders, sometimes for not a whole lot of money.

If you want an advanced engineering project then go ahead and try to build one, just realize that you will spend more money on parts and almost certainly get inferior results to the cheapest Chinese welders on the market.

Also how experienced are you at welding? MIG is one of the easier ones to learn but it still takes a great deal of practice to get good at it.
Refrigerator:

--- Quote from: james_s on June 23, 2019, 03:37:16 am ---
Also how experienced are you at welding? MIG is one of the easier ones to learn but it still takes a great deal of practice to get good at it.

--- End quote ---

I learned to MIG weld when i was 13, it's basically a hot glue gun for metal.
Assuming the welder is correctly set up it takes about 30 minutes to learn MIG.
Refrigerator:

--- Quote from: strawberry on June 22, 2019, 10:54:00 pm ---How about sinhronous rectifier?

modern IGBT can run 50..100kHz not just 20..30kHz

I think, bipolar gate drive is better than unipolar

--- End quote ---

Synchronous rectification would over-complicate things.
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