Hey all,
I'm trying to fix a coworker's stick welder. It's an old Ward's PowerKraft AC/DC machine and it won't run a bead...just a slight spark. I opened it up and tested the diodes. Three were fine, but one is open in both directions, so I'm pretty confident that's the problem. Unfortunately, I can't imagine anybody stocks parts for it, and I don't know who made it originally to try cross-referencing.
The bad diode is marked 70HF30. I can find that number but all of the places like Mouser or Digikey have it as a non-stock item, 20 week wait time, and minimum order of 100. From my limited knowledge of electrical components, it would seem this is a 70A diode, forward/normal polarity and 300 volt max. If I can find 70A, forward, 400 volt max, would it be a problem? My thought was if I replaced the pair it would work, but figured I may be missing something.
Thoughts?
I'm trying to fix a coworker's stick welder. It's an old Ward's PowerKraft AC/DC machine and it won't run a bead...just a slight spark. I opened it up and tested the diodes. Three were fine, but one is open in both directions, so I'm pretty confident that's the problem. Unfortunately, I can't imagine anybody stocks parts for it, and I don't know who made it originally to try cross-referencing.
The bad diode is marked 70HF30. I can find that number but all of the places like Mouser or Digikey have it as a non-stock item, 20 week wait time, and minimum order of 100. From my limited knowledge of electrical components, it would seem this is a 70A diode, forward/normal polarity and 300 volt max. If I can find 70A, forward, 400 volt max, would it be a problem? My thought was if I replaced the pair it would work, but figured I may be missing something.
Thoughts?
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