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  #41  
Old 04-16-2019, 11:12 AM
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GWIZ GWIZ is offline
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Originally Posted by threepiece View Post
Is the selenium rectifier shown in the picture below?
This picture is upside down.
A quick look
With the code number it looks like you got lucky
I see diodes,
"No" selenium rectifier.
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  #42  
Old 04-16-2019, 11:18 AM
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Originally Posted by LKeithR View Post
????? Never heard of copper coated rod. Get some 6013 or 7018 to play with...
Carbon arc rod just for a power test should be ok.
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  #43  
Old 04-16-2019, 11:59 AM
threepiece threepiece is offline
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Originally Posted by LKeithR View Post
????? Never heard of copper coated rod. Get some 6013 or 7018 to play with...
I am referring to TIG or flame welding rod ER70S. These rods have what looks like a copper coating presumably to minimize corrosion. I expect I should be able to test the welder output with this rod first before buying anything else.
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  #44  
Old 04-16-2019, 03:43 PM
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If it does have selinium rectifiers free is about as high as I would go for any welder.
THe problem is that they are a mechanical assembly rather than a welded and deposited diode in an inert gas Assembly They have a finite lifetime due to the mechanical nature of them and we are about 30 years past the expiry date of any selenium rectifier.
They can be replaced by suitable silicone diodes in stud mount packages but you do need to know what you are doing.
The cost of the diodes and heatsinks will not be cheap. If it has silicone stud mount diodes the life expectancy and availability of parts is much better.

I just rebuilt a newer diesel miller big forty 400 amp welder the diodes were over $800 CDN my cost so be aware of what you are getting into.
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  #45  
Old 04-16-2019, 09:44 PM
threepiece threepiece is offline
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The welder seems to work, although I'm not sure how well yet. I have varying degrees of output relative to the switch setting but it seems weak. I suspect the small lug connector and the long length of 8ga. ground wire I was using contributed to that.

I'll try to go to the scrap yard tomorrow to get more suitable cable.
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  #46  
Old 04-16-2019, 11:28 PM
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Quote:
Originally Posted by threepiece View Post
The welder seems to work, although I'm not sure how well yet. I have varying degrees of output relative to the switch setting but it seems weak. I suspect the small lug connector and the long length of 8ga. ground wire I was using contributed to that.

I'll try to go to the scrap yard tomorrow to get more suitable cable.
while you are at the scrap yard look out for a foot pedal you need the one that was for that machine.

Look in the manual and take a picture of the pedal and take a picture of the "connector plug" on the welder so you know what to look for.
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