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  #21  
Old 12-29-2017, 03:17 PM
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Originally Posted by GWIZ View Post
Does NOT appear to have HF. $900 is way too high.
That's because it's NOT a TIG machine.

It has a crank on the front to wind the laminated shunt up/down into the core.

The similar looking 300/300 TIG has a mag amplifier control
(leetle knob on the front) that also allows a foot pedal control.
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  #22  
Old 12-29-2017, 03:30 PM
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They had one of those at work and I used to tie it and a 200 amp machine together to be able to run large carbons for the air ark.
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  #23  
Old 12-29-2017, 05:52 PM
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Originally Posted by digr View Post
They had one of those at work and I used to tie it and a 200 amp machine together to be able to run large carbons for the air ark.


Interesting, never thought about adding another welder to increase amps.


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  #24  
Old 12-29-2017, 06:17 PM
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Interesting, never thought about adding another welder to increase amps.


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This was not nice but once when when there were four of us welders working on a barge (welding cables laying all over hell) I sharpened a welding rod stuck it into my buddy's lead and turned on my machine and of coarse when he started welding instead of 125 amps he was running 250 amps so when he went back to adjust his machine I took the rod out of my stinger and when he got back he could verily strike a ark. This went on for some time and everyone except him knew what was going on until I was caught laughing my ass off.
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Old 12-30-2017, 03:23 PM
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If you're in the market for that class of machine, you might also look at Miller 330A/BP welders. You can pick them up cheap and they've got serious power (465A of AC fury)...along with HF, solenoids for gas and water, etc. Basically an early version of the Syncrowave, but sine-wave only / no AC balance.
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  #26  
Old 12-30-2017, 03:41 PM
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I just scrapped one of the early 3302/BP's it had selenium rectifiers in it.
I believe that later units had silicon rectifiers but if you look at one check the serial number for the age before you buy it. Confirm that it does not have selenium rectifiers before you buy it.
selenium rectifier failures are akin to a wet skunk that has been eating pickled eggs and probably the smoke and residue will be toxic.
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Old 12-30-2017, 04:56 PM
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Quote:
Originally Posted by Wolfram View Post
If you're in the market for that class of machine, you might also look at Miller 330A/BP welders. You can pick them up cheap and they've got serious power (465A of AC fury)...along with HF, solenoids for gas and water, etc. Basically an early version of the Syncrowave, but sine-wave only / no AC balance.
I also own a 330 a/bp and I would NOT air arc off of it.
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  #28  
Old 12-31-2017, 01:52 PM
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Quote:
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I also own a 330 a/bp and I would NOT air arc off of it.
I also own a 330 A/BP but have not used it yet. I am not familiar with air arc specifics. Could you explain why not?
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  #29  
Old 12-31-2017, 04:18 PM
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I also own a 330 A/BP but have not used it yet. I am not familiar with air arc specifics. Could you explain why not?
The air arc process is pretty darn erratic.

I have seen the welding cables jumping as the arc progress's.

I have scrapped out another tm-500/500 and the main xformer
is ruggedly built, the miller 330 a/bp not so much.

Mind you, the miller 330 a/bp is a fine machine, for what it was designed,
not air arc.
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  #30  
Old 12-31-2017, 05:59 PM
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Quote:
Originally Posted by terry lingle View Post
... selenium rectifier failures are akin to a wet skunk that has been eating pickled eggs and probably the smoke and residue will be toxic.
Yes, toxic it is. I like this from Wiki: "Selenium rectifiers had a shorter lifespan than desired. During catastrophic failure they produced significant quantities of malodorous and highly toxic fumes that let the repair technician know what the problem was."

Way back in the day, Miller Electric had their Gold Star selenium rectifiers which were the best of the high-powered rectifiers.
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