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Mig welding question

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burgerman:
 Hi all, I have a trusty Snapon 130 mig welder, which is fine for my useage, I have upgraded to a 20 kilo argon mix bottle and purchased a proper set of regulaters and flow meter, Question is though; What flow rate do i use ?? i have read about 15 litres/minute, which sounds a awfull lot in reality ?? 

dxmedia:
About 7 inside, you'll have to crank it up if outside to stop the shroud from blowing away.

topless matt:
15 is about right if you have a euro torch, if not then the gas flow will be restricted anyway so have it on 10l/min

As said above, the wind can have an effect so if the gas is set at 15 it should provide a decent shroud when welding outside to take into account any slight breeze

fatbaz:
Hi All

I run a Clarke 160 Turbo on CO2, the regulator set at a bar and a bit or 20psi, works a treat, takem it to about 30 psi when outside.  Been using the same pressures on previous MIGs running Arogosheild for the past 25 years.

Never come across the litres/minute method before on MIG welding (on my bottle that would be 10 litre capacity X 50bar pressure, that gives me 500 litres at atmospheric pressure, divided by 15ltres/minute equals 33 minutes welding !!!!  NO, can't be I must have got something wrong here, my bottle at 20 psi lasts for weeks not hours.

Somebody enlighten me please  :?

topless matt:

--- Quote ---Never come across the litres/minute method before on MIG welding (on my bottle that would be 10 litre capacity X 50bar pressure, that gives me 500 litres at atmospheric pressure, divided by 15ltres/minute equals 33 minutes welding !!!!  NO, can't be I must have got something wrong here, my bottle at 20 psi lasts for weeks not hours.

Somebody enlighten me please 
--- End quote ---

You mush have a very old regulator on the mig then as every regulator i have ever seen has the flow guage as litres per minuite.

Also, the bottle contains the argoshield as a liquid which occupies a lot less space then when it is stored as a gas.
I forget how much my  bottle holds in terms of actual volume of gas but it is a huge amount, think it is two sizes from the larges bottle that boc do, even though i get through that in about 2 weeks  :roll:

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