Electronics > Projects, Designs, and Technical Stuff

Homemade IGBT MIG welder with ATX PSU parts. [blown yet again][blown count: 5]

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Refrigerator:
Getting a little tight in the ATX case but everything should fit just fine.
I might be able to fire this up either today or tomorrow.

Ps: the plywood is bowing but that's only because it's just a mock-up to see how everything fits.

mikerj:

--- Quote from: techman-001 on July 02, 2019, 10:30:41 pm ---
--- Quote from: mikerj on July 02, 2019, 06:59:45 pm ---<snip>
 All the cheap MIG welders have problems (flexible plastic rubbish held together with self tapping screws).

--- End quote ---

Really? what utter junk. Chinese I assume ?

--- End quote ---

Of course.  They are very cheap but you get what you pay for.

Refrigerator:
Just tested the beast out, but not on 230V yet.
I connected the 12V supply to all the control circuitry as well as the bridge rectifier for the inverter and ran a quick test, shorted the output with with my DMM set to amps and got 1.3A.  ;D
Now i can hook up the scope and set my deadtime, after that everything will be packed into the ATX case and closed shut.
Also i'm not sure whether or not to put a choke on the output of the rectifier, i found a nice FBT core that has brass bolts holding it together and i can fit 3 turns of my 35mm2 welding wire in it.

techman-001:

--- Quote from: mikerj on July 05, 2019, 10:10:00 am ---
--- Quote from: techman-001 on July 02, 2019, 10:30:41 pm ---
--- Quote from: mikerj on July 02, 2019, 06:59:45 pm ---<snip>
 All the cheap MIG welders have problems (flexible plastic rubbish held together with self tapping screws).

--- End quote ---

Really? what utter junk. Chinese I assume ?

--- End quote ---

Of course.  They are very cheap but you get what you pay for.

--- End quote ---

Of course you do, but if it only lasts a short while because it's junk, is it even worth buying ?

My Father always said to me, buy the best you can afford, that way you will only buy it once, and save money over buying junk again and again.

Refrigerator:

--- Quote from: techman-001 on July 05, 2019, 11:41:37 am ---
--- Quote from: mikerj on July 05, 2019, 10:10:00 am ---
--- Quote from: techman-001 on July 02, 2019, 10:30:41 pm ---
--- Quote from: mikerj on July 02, 2019, 06:59:45 pm ---<snip>
 All the cheap MIG welders have problems (flexible plastic rubbish held together with self tapping screws).

--- End quote ---

Really? what utter junk. Chinese I assume ?

--- End quote ---

Of course.  They are very cheap but you get what you pay for.

--- End quote ---

Of course you do, but if it only lasts a short while because it's junk, is it even worth buying ?

My Father always said to me, buy the best you can afford, that way you will only buy it once, and save money over buying junk again and again.

--- End quote ---

Does it even have a spring or does it rely on the flex in the plastic to keep the pressure constant?
And that motor looks wimpy as. For a spoolgun this sort of thing would be ok-ish but not for anything else.

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