Electronics > Projects, Designs, and Technical Stuff

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

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strawberry:
isnt that your voltage is too high for MIG welder. arc voltage should be 30V max

Refrigerator:

--- Quote from: strawberry on July 24, 2019, 07:16:37 pm ---isnt that your voltage is too high for MIG welder. arc voltage should be 30V max

--- End quote ---
It's an inverter welder, the diodes see high voltage (not mains of course) impulses, which then get smoothed out by the inductor, very similar to a buck converter.
The 4V i got were at whatever the max duty cycle (because it was undervoltage) i set the welder to was (85% i think), assuming 1:3 ratio between primary and secondary voltage i would get 113V when running on mains at that max set duty cycle.
If 113V = 85% then to get 21V (common MIG voltage) the controller would reduce the duty cycle to roughly 16%.
Also since during the test on 12V the welder was basically unloaded (except for the 100Ω idle load resistor) i can assume that 4V was also my peak voltage and therefore i can also assume that 113V would be the peak voltage on mains.

Refrigerator:

--- Quote from: xavier60 on July 24, 2019, 06:53:38 pm ---A schematic would make it possible to follow what is being done.

--- End quote ---
I planned to release the schematic in my blog as soon as i finished the welder because i kept changing the design and component values constantly.
But i do have a crude one drawn (as a guide when soldering), although i doubt that it would be very useful.


 
Ps: please excuse the crudity of the schematic, last time i used KiCAD was years ago.

strawberry:
should be ~45V
for scratch start stick welder 113V is fine

Refrigerator:

--- Quote from: strawberry on July 24, 2019, 09:36:44 pm ---should be ~45V
for scratch start stick welder 113V is fine

--- End quote ---

Google says 12 to 30V for MIG

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