Welding GAS? CFM, LPH, CFH

[TheGreyRider]

I have a question that i hope someone can answer. I bought a miller welder from a friend a while back. The manual says i should set the gas to 20+ CFH, but the regulator only reads CFM, and LPH. What is do those letters stand for and where should i set them. If i open the regulator the whole way it reads 34CFM or 16LPH.

 

[k0ua]

I have a question that i hope someone can answer. I bought a miller welder from a friend a while back. The manual says i should set the gas to 20+ CFH, but the regulator only reads CFM, and LPH. What is do those letters stand for and where should i set them. If i open the regulator the whole way it reads 34CFM or 16LPH.

try this:

cfh x .472195 = L/min

L/min x 2.12 = cfh

James K0UA

 

[TheGreyRider]

so you are saying that if the book says use 20 CFH and my gauge reads CFM then i should do this?

supposed to use 20 CFH so 20 x .472195 = 9.44

so i should set my gauge to approx. 9 or 10 CFM?

Is that correct? Also what does the LPH stand for?

thanks.

 

[k0ua]

Ok how many minutes are in an hour? 60 right. so if you you need 20 CFH then you would need to set the gauge at (20 divided by 60) or .33 CFM. notice the decimal point, thats 1/3 of a cubic foot a minute.

but I am having trouble believing that the max flow is 34 CFM and at the same rate is 16 LPH.. because 34 cubic foot a minute is an awful lot more gas than 16 liters per hour.. how about a close up pix of your guage

James K0UA

 

[TheGreyRider]

well i ran out to get a picture of the gauge and it is in CFH.. Dont know why i thought it was CFM. So basically it was set to 34 cfm and 16 lph, now its set to 20cfh and about 10lph.

Thanks for the input, i am glad you caught the LPH not being correct or i would have went on thinking it was CFM not CFH.

 

[yomax4]

Welding indoors with no wind? Turn it down to 15cfh. If your welds look good, Enjoy the gas savings.

 

[brain55]

Without getting a conversion chart let me see if I can break this down.

1 liter = 1000 cc's 1" = 2.54 cm

so 1 liter is roughly a 4" cube

it would take 27 of these cubes to make 1 cubic ft.

so 1 cubic ft. approx = 27 liters

1 cubic ft/min would be approx. 1620 liters/hr.

Brian

never mind I see you figured it out

 

[k0ua]

Without getting a conversion chart let me see if I can break this down.

1 liter = 1000 cc's 1" = 2.54 cm

so 1 liter is roughly a 4" cube

it would take 27 of these cubes to make 1 cubic ft.

so 1 cubic ft. approx = 27 liters

1 cubic ft/min would be approx. 1620 liters/hr.

Brian

never mind I see you figured it out

1 Cubic Foot = 28.3168466 Liters

Pretty good for doing it in your head.

 

[Mark @ Everlast]

I have a question that i hope someone can answer. I bought a miller welder from a friend a while back. The manual says i should set the gas to 20+ CFH, but the regulator only reads CFM, and LPH. What is do those letters stand for and where should i set them. If i open the regulator the whole way it reads 34CFM or 16LPH.

Math doesn't add up. Its probably going to read in CFH and LPM. IF it read in CFM at 34 cfm that's like 34x60= 2040 CFH!!!!!...Not going to happen. LPM is roughly HALF of CFH. You should multiply CFH roughly by 1.9 to get LPM. More likely to be 34 cfh and 16 lpm as that makes sense and is in the ball park. Flow meters are affected by gas density. Not all flow meters will be accurate if a "OFF" calibrated gas is used.

 

[dstig1]

CFH= Cubic feet per hour
CFM = Cubic Feet per minute
LPM = Liters per minute
LPH = Liters per hour

Conversions aren't too difficult from there... Obviously cfh = 60 x cfm... (60 min/hr). If you have CFM on your scale, you should be easily able to find a comparable flow (20 cfh = 0.333 cfm, for example).

Edit: Oops - didn't read far enough... Nevamind...