Argon Flow Rate Conversion on Tig Calculator

[Buggy Chief]

The Valuable resource that is the Welding Calculator on the Everlast site and Miller Site post the Argon flow rate in denomination of CFH...However the regulator that came with my Everlast PP205 is in LPM.

Can anyone give any insight into the appropriate conversion? For example aluminum 1/16" with a corner weld calls for 15cfh...what is this in lpm?

I set my 40 argon tank to 17, however this was in lpm and not cfh and my argon tank ran out in 1 hour

Thanks for any feedback.

[Jake98]

roughly half the cfh # is lpm. I did the same thing, almost..
guys that know what they're doing say to turn it down until you see porosity, then turn it back up a little.

[Buggy Chief]

Thanks Jake98. I just found the conversion calculator and you are correct. 15 cfh converts to 7 lpm.

http://www.convert-me.com/en/convert...olume#ft3/hour

Thanks again for your response and help.

[Jake98]

Hey, no problem, I've got at least two hours tig experience now! (one per tank full..)

[Joe from NY]

I was disappointed myself because on the phone with the salesman before I ordered, we discussed the difference between the everlast tig machines and the Miller ones. I mentioned the metric flow meter and I was told that the flowmeters are not calibrated in metric. When i recieved my unit, i found out that was clearly not true. And the funny thing is my manual from everlast mentions a CFH measure, not a metric one.

[DVA]

~3.8 liters per gallon

7.48 gallons per ft^3

60 min per hr

1 [ft^3/hr] = X liters/hr can be calculated as follows


1 [ft^3/hr] * 7.48 [gallons/ft^3]*3.8 [liters/gallon] = 28.4 [liters/hr]

Because there are 60 min per hr the 28.4 liters per hour can be divided by 60 to provide a conversion from CFH to liters per minute (LPM).

28.4 [liters/hr] /(60 [min/hr]) = 0.47 LPM = 1 CFH

With this number 0.47 being so close to 0.5, just divide the usual CFH by two and this will provide a close conversion for LPM to use for a setting.

I.E. 15 CFH ~ 7.5 LPM or 20 CFH ~ 10 LPM.

Hope this helps save some gas.

[geezer]

Hi Buggy Chief,,,if you have a regulator marked in litres you are a head of the game,,,cause working in CFH and trying to remember those settings is a PITA, working in litres is so much simpler,,,,first of all you must know your cup size,,,it just so happens that the cup size and the litre settings are nearly the same.

For example a number 3 cup would be 3 litres, and a 4 would be 4 litres,,,,,this varies somewhat as the amperage increases,,,however as a good rule of thumb you can say,,,,that litres = cup size + 1 up to 200 amps and then litres = cup size + 2 up to 250 amps. (the limit of most single phase tig welders)

You can check this out by downloading the CK Worldwide tech manual and looking at the chart on the bottom of page 3
http://www.ckworldwide.com/technical_specs.pdf

Hope this helps answer your questions.........Knowing your cup size and using the proper electrode size for the amps is the key, setting the gas flow in litres is then easy.

[Tritium]

Excellent information as usual geezer. Thanks. How does the rule work for gas lens setups?

Thurmond

[geezer]

Excellent information as usual geezer. Thanks. How does the rule work for gas lens setups?

Thurmond

Thanks Turmond,,,always glad to help if I can,,, As far as using a gas lens goes,,,according to the chart on page 3 the rule of thumb would approximate cup size less 1,,,and cup size less 2 in the 200 amp+ range,,,due to the increased efficiency of the lens,,,check out the chart on page 3 and it will give you a rough correlation for that...I find it much easier to remmeber simple rules of thumb and then adjust from there...

[redbeard]

Hi Buggy Chief,,,if you have a regulator marked in litres you are a head of the game,,,cause working in CFH and trying to remember those settings is a PITA, working in litres is so much simpler,,,,first of all you must know your cup size,,,it just so happens that the cup size and the litre settings are nearly the same.

For example a number 3 cup would be 3 litres, and a 4 would be 4 litres,,,,,this varies somewhat as the amperage increases,,,however as a good rule of thumb you can say,,,,that litres = cup size + 1 up to 200 amps and then litres = cup size + 2 up to 250 amps. (the limit of most single phase tig welders)

You can check this out by downloading the CK Worldwide tech manual and looking at the chart on the bottom of page 3
http://www.ckworldwide.com/technical_specs.pdf

Hope this helps answer your questions.........Knowing your cup size and using the proper electrode size for the amps is the key, setting the gas flow in litres is then easy.

Just when I was about ready to get a piece of tape to make an alternate scale, you come along with a much more elegant solution.

[Jake98]

Are lenses better than cups for some applications or in general?

[geezer]

Are lenses better than cups for some applications or in general?

The advantage I see with a lens over a cup is electrode stick out to reach into tight areas, the lens gives a more directed gas flow, some people try and cheat by using a small cup to get into the tight areas,,, all that does it overheat the cup and the electrode...so yes a lens would seem the way to go but it costs more like everything else that's good. Of course that is stated on page 5 of the CKworld wide tech manual,,,,good reading ,,,see my previous posts to link to it.

[Buggy Chief]

Hey Geezer-

Thanks for the helpful tips to a Newbie.

[Jake98]

Ditto Geezer

[zoama]

The price of a regular gas lens is nothing considering how long they last $9 for a five pack http://www.ebay.com/itm/5-45V43-1-16...item2eb270ea09 and $5 for a ten pack of cups http://www.ebay.com/itm/10-53N59-5-a...item2c5624f9e6

Tip: if you don't want to buy a bunch of different size gas lenses, just buy one pack of the smallest size you'll use and drill them larger as needed.