Question about gas in the line

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Quick question,After I am finished tig or mig welding and I turn off the gas at the cylinder, should I bleed out the gas that is leftin the hose? or is it ok, to not bleed it, and there is pressure in there for days before it leaks out on its own?thanks,PaulAHP AlphaTig 200x 3rd gen.Lincoln Power Mig 210MP
Reply:Don't bother bleeding out the remaining gas.It will keep Earth's atmosphere out of your lines for an extra 1/2 day or so...Be wary of The Numbers: Figures don't lie,. but liars can figure.Welders:2008 Lincoln 140 GMAW&FCAW2012 HF 165 'toy' GTAW&SMAW1970's Cobbled together O/A
Reply:its fine. It will most likely bleed off somewhere on its own after a day or two.
Reply:Leave it or just burp it if it makes you feel better. Pressures on MIG/TIG inert gasses are low.  I don't deflate the tires on my truck, though it can be days or a week between uses."USMCPOP" First-born son: KIA  Iraq 1/26/05Syncrowave 250 w/ Coolmate 3Dialarc 250, Idealarc 250SP-175 +Firepower TIG 160S (gave the TA 161 STL to the son)Lincwelder AC180C (1952)Victor & Smith O/A torchesMiller spot welder
Reply:To prevent degradation of the seals and hoses and stuff, before shutting down each day, you need to use a vacuum pump to suck out the remaining gas in the lines and replace it with something inert ... like argon. ;-)
Reply:My OCD tells me to bleed it off every time. Someday I'm going to put my hands over my ears and run in the house without doing it just to see what happens.
Reply:Originally Posted by PipelinerMy OCD tells me to bleed it off every time. Someday I'm going to put my hands over my ears and run in the house without doing it just to see what happens.
Reply:Hello Paul, others have given you great replies. Consider this as well: if you leave the gas in the lines after you shut down and then come back later and notice that the pressure is no longer registering, it is an indicator of a leak. Just how bad of a leak can be determined by initially watching the gauges when you first shut down, if they fall off immediately then you know the leak is a considerable one. If you check every day over the course of a few days and it falls off a bit every day or two and is finally empty after a few days or more then the leak is pretty minimal. Get some soapy water and spray down the connections and look for leaks and also spray down the hose looking for bubbles. Leakage of any consequence will produce bubbles. Properly sealed gas systems will help to conserve on waste of the shielding gas, that is unless you don't have a budget that you are trying to work under. Good luck and best regards, Allanaevald
Reply:Originally Posted by aevaldHello Paul, others have given you great replies. Consider this as well: if you leave the gas in the lines after you shut down and then come back later and notice that the pressure is no longer registering, it is an indicator of a leak. Just how bad of a leak can be determined by initially watching the gauges when you first shut down, if they fall off immediately then you know the leak is a considerable one. If you check every day over the course of a few days and it falls off a bit every day or two and is finally empty after a few days or more then the leak is pretty minimal. Get some soapy water and spray down the connections and look for leaks and also spray down the hose looking for bubbles. Leakage of any consequence will produce bubbles. Properly sealed gas systems will help to conserve on waste of the shielding gas, that is unless you don't have a budget that you are trying to work under. Good luck and best regards, Allan
Reply:Originally Posted by PB17654Is it normal for it to take 3 or 4 days for it to go from 1500psi to 0?thanksPaul
Reply:Hello Paul, if it is bleeding off after 3 to 4 days then the system is reasonably tight. You could probably take some time and make it better if you have the time to spend. Just consider that there are a lot of different places where leaks could be found. Starting with the regulator you have the connection between the bottle and the regulator/flowmeter, then you have the internal components of the regulator/flowmeter, then you have the connection from the regulator/flowmeter to the gas hose, from there you have the connection from the gas hose to the back of your feeder/all-in-one welder, then you have the internal connections inside of the feeder/all-in-one welder(this includes a gas solenoid as well and could include a couple more connections and hoses). So if you have the time you could go through the entire gas path and possibly address various leaks here and there or maybe just a single one. Good luck on this and best regards, Allanaevald
Reply:Hello Paul, if it is bleeding off after 3 to 4 days then the system is reasonably tight. You could probably take some time and make it better if you have the time to spend. Just consider that there are a lot of different places where leaks could be found. Starting with the regulator you have the connection between the bottle and the regulator/flowmeter, then you have the internal components of the regulator/flowmeter, then you have the connection from the regulator/flowmeter to the gas hose, from there you have the connection from the gas hose to the back of your feeder/all-in-one welder, then you have the internal connections inside of the feeder/all-in-one welder(this includes a gas solenoid as well and could include a couple more connections and hoses). So if you have the time you could go through the entire gas path and possibly address various leaks here and there or maybe just a single one. Good luck on this and best regards, Allanaevald