Vintage Hobart Handler Welder Bad Silicon Didode?

Semiconductor Discrete Semiconductor Products
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Greetings Super new to the Form. We have a Vintage Hobart Handler Welder that the wire feed has quit working on. I have linked it to a Silicon Diode. The number on mine is 406170-2 Made in Italy 8804. Putting my information into The Google Miller Welding comes up with: Miller 406170-003 Diode, Silicon, Positive Base for the low price $46.99. Which is more than the welder is worth. Any help finding a lower cost one.

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Welcome to the TechForum!

The part marking 406170-2 is the OEM part number for the diode. I am not finding the specs online to cross it another part number in our system.

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I have also found : Miller DIODE - 10 A - 300 V at Linde Gas & Equipment

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Hello @moores7,

Could you tell us more about the diode:

  1. thread pitch

  2. length of threaded portion

  3. cathode or anode as base. A picture would be especially helpful especially if it shows the diode symbol - (looks like an arrow with a bar across it).

DigiKey has many related diodes, but I need you help to narrow down the search.

Awaiting your reply,

Aaron

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Add i

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![5|375x500](upload://alkDYhEffrvHnZWWUznfUfYKq8y.jpeg)
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Looks to be I would say 1/4-20 THread

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Would you be able to list all the writing on this part? I can see the 8804 and it appears there could be more.

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All I can tell 406170-2 8804 Italy

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Hello @moores7,

I don’t see the diode’s arrow in your pictures.

Based on the part number and a search of related web pages, I’m led to believe this is an “arrow down” (cathode stud) diode. I’m also assuming 10 A rating with a 300 V reverse rating.

Staying on the safe side, I would recommend something like this Vishay part. As a rule, there is no harm using a diode with higher current and reverse ratings.

Tech Tip: The diode is often included as part of the logo. This may or may not indicate the diode’s true polarity.

Be sure to verify the physical size using the datasheet information.

Best wishes,

APDahlen

P.S. Verify the diode on the other side of your heatsink is the same type. Also, I would recommend replacing them as a pair as whatever stressed one side likely weakened the other.

P.P.S. Please let us know if this successfully repaired the welder.

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Ordered thanks Ill let ya know: 40HF40-ND‎
‎VS-40HF40‎
DIODE GEN PURP 400V 40A DO203AB
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