Thought weak HF was the problem.

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Jan 25, 2020 Airco 250 heliwelder v Welcome to WeldingWeb.com, the ultimate Source for Welding Information & Knowledge Sharing! Here you can join over 40,000 Welding Professionals & enthusiasts from around the world discussing all things related to Welding. Mike: The AIRCO 250 AC/DC welder is single phase 220v, nothing rea special on this part of it. After I posted this I took the Bridg rectifier out of the welder to test the power diode and the SCR's. Thi welder has two SCR's (hockey puck style) mounted in the aluminum hea sink. Here's were I need some help. I tested the power diode with.


I got the new caps for the HiFreq. installed...
Less spectacular improvements than I was hoping for.
HiFreq is 'somewhat' stronger, but on Alu. it still does weird things.
It acts 'cold' even on high range.
There is not an abundance of cleaning action, and the puddle is sooty.
Makes no difference if I clean everything rabidly, or not.

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Then there's the ever present weirdness where the puddle seems to 'vibrate'
or hop up and down about .040 or so, plus the arc has that buzzing sound thatParts
goes along with the vibrating. When it's doing that, it acts real cold, sooty and
hard to get the puddle to even get shiny.
3 things I suspect:
1.Torch is sucking air, or bad bottle of Argon.
2. My aluminum service wire is not delivering enough amps, or somehow primary
voltage is dropping off.
3. Internal problems.......other caps, or ????
Also weird that some days it will act quite hot with a smooth sounding arc,
then other days......what I described above.
I have an old air cooled Linde torch around someplace, I will try that just for chance.
Any ideas what the problem could be?
Appreciate any ideas.

Airco 300 Heliwelder V Manual

Thought weak HF was the problem.
I got the new caps for the HiFreq. installed...
Less spectacular improvements than I was hoping for.
HiFreq is 'somewhat' stronger, but on Alu. it still does weird things.
It acts 'cold' even on high range.
There is not an abundance of cleaning action, and the puddle is sooty.
Makes no difference if I clean everything rabidly, or not.

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Then there's the ever present weirdness where the puddle seems to 'vibrate'
or hop up and down about .040 or so, plus the arc has that buzzing sound that
goes along with the vibrating. When it's doing that, it acts real cold, sooty and
hard to get the puddle to even get shiny.
3 things I suspect:
1.Torch is sucking air, or bad bottle of Argon.
2. My aluminum service wire is not delivering enough amps, or somehow primary
voltage is dropping off.
3. Internal problems.......other caps, or ????
Also weird that some days it will act quite hot with a smooth sounding arc,
then other days......what I described above.
I have an old air cooled Linde torch around someplace, I will try that just for chance.
Any ideas what the problem could be?

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Appreciate any ideas.