Thread: Larger disposable cylinders

Anybody using these cylinders, looking for one in Brisbane

Ken

http://www.tesuco.com.au/media/42096/IND_DIS_V02.pdf

I have used a single bottle of pure Argon purchased for $69 from supergas.My use was for site tig welding ally scaffolds and i thought i would try it once.My findings are,its difficult to get enough flow out of the cyl to weld properly and im guessing flow rate is in the order of 8 to 10 lpm maximum,not enough to weld ally in a workshop/industrial enviroment with the slightest of breeze.Also the contents last for a maximum of 25 to 30 minutes of welding ally,stainless would be longer with a lower flow or smaller cups but it is still a expensive option,especially if you are paying for the gas for your own jobs.personally i would go the larger bottles available on ebay and think of it as spreading the cost over a year or two.as allways it depends on what you are doing.As said,cyl $69--- gauge $40---adapter$25.cheers danny.

Gringo,which gas are you looking for and what type of welding
John.

I have a small project I'm working on that needs a bit of aluminium welding,
an argon disposable cylinder would be plenty
I have a 240v kempi mig welder, been welding steel using argoshield and co2

I was going to suggest CO2 from a home brew shop but that won't do what you want.
John

2.2l would last about 30 seconds

Hi China,
how do you calculate that?
2.2l at 10,000KPa is a fair bit of gas. As Danny reported it lasted 25-30mins for him....

Originally Posted by jhovel

Hi China,
how do you calculate that?
2.2l at 10,000KPa is a fair bit of gas. As Danny reported it lasted 25-30mins for him....

I'm guessing they calculate things a bit differently in China.

The Ideal Gas Law says PV = nRT. If we assume temperature stays more or less the same (which is doesn't in reality, but makes things a bit simpler) the right side are all constants, so as pressure drops, the volume increases proportionally. Thus 10,000kPa dropping to atmospheric pressure of 100kPa is a factor of 100 decrease. That means the 2.2 litres of compressed gas becomes 220 litres at atmospheric pressure. At 10 lpm flow, that gas would last 22 minutes.

I was being sarcastic!

Originally Posted by jhovel

Hi China,
how do you calculate that?
2.2l at 10,000KPa is a fair bit of gas. As Danny reported it lasted 25-30mins for him....

and that is long enough for me

Originally Posted by RustyArc

I'm guessing they calculate things a bit differently in China. The Ideal Gas Law says PV = nRT. If we assume temperature stays more or less the same (which is doesn't in reality, but makes things a bit simpler) the right side are all constants, so as pressure drops, the volume increases proportionally. Thus 10,000kPa dropping to atmospheric pressure of 100kPa is a factor of 100 decrease. That means the 2.2 litres of compressed gas becomes 220 litres at atmospheric pressure. At 10 lpm flow, that gas would last 22 minutes.

All true, except you need substantially more than 10LPM to MIG weld ally successfully, generally you will be knocking on the 20LPM door.
That would bring your welding time back to around 10 minutes.
By the time you buy gas and wire, surely any job that you could weld in 10 minutes, (assuming that you need no set up or practice time), would be best farmed out to somebody already set up for ally?