40 cuft. I don’t use my welder a lot, so it lasts a long time. I traded a 40 cuft. O2 tank for, so I only had to pay for the gas. Look for a used one on craigslist or marketplace and then turn it in for a refilled cylinder. Good luck…Rob
Hi Julie, we use the smallest tank available these days but with the first welder a PUK2, well we needed the biggest tank We could get. We changed over to the German regulator and reality stepped in and consumption went way down. Next, PUK developed a replacement tip (for the 2) so that halved consumption again. We now run with a PUK3 Plus and that uses less Argon again.
My second 40 cuft in three years is still going strong. That being said, I know it will need replacing soon based on the gauges. I don’t use my PUK as much as others, but it is used at least 4 or 5 times a week. I have the PUK regulator. I have no idea what difference that makes since I have always had a PUK regulator…Rob
My main tank is 300cf and my back up is 80cf. The reason being the 300cf is the only one I can exchange for medical grade 92% argon; the 80cf comes in the 75% argon. The difference in clean up is worth it. The big tank lasts 3-4 years!
Do the Argon for these welders need to be at these purities?
Welding Argon is usually 99.996% pure.
For Mig/Mag welking with thread feeding spool one use 75% Ar and 25% Carbon dioxide.
For any Tig welding the purest possible Ar is preferred.
Medical grade just don’t hold up for welding seem purity.
I tried using my husbands 75% argon that he uses for his mig welder - not a good idea. I got the nearly pure and it works well. I use a PUK and their regulators use much less argon than the orion ones.
The 75% is mixed so so it will oxidize and reduce some of the impurities from the steel in the weld seem.
Carbon dioxide is funny that way.
I’m more worried of the 8% oxygen in the medical 92% Argon, won’t it react with Silver and Palladium when it is molten??
I’ve got a 60 cubic foot argon tank, but only because it cost just a tiny bit more than the 40. A 40 cubic foot or even a 20, would have been fine.
It always hurts to accidentally empty the tank. I feel your pain! At my job, we have a Neutec J-2R vacuum casting machine that uses a huge nitrogen tank. At least a couple of times a year someone who uses it (true confession, occasionally it’s me) forgets to turn off the nitrogen and empties the whole tank. I hate that!
Julie, what kind of welder to you have? PUK or Orion?
Right now I’ve got a PUK 5.1 and an Orion 200i3. I have noticed that the Orion seems to use more argon than the PUK, but not enough to drain the tank too quickly. I think you made a smart move keeping the tank that you own.
That’s a great welder Julie! You’re lucky to have one!
This doesn’t sound like it’s your problem, but just in case you don’t know. For a while Orion welders had a reputation for going through argon too fast. Eventually, Orion switched out their argon regulator for a different model. If you feel like you’re using too much argon, reach out to Orion technical support and tell them your issue.