Used gas cylinders
07-20-2007, 01:03 AM
#1
0.5 BAR
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Join Date: Feb 2007
Posts: 96
Used gas cylinders
Buying a tank local around here is ridiculous price wise. So I've found tanks cheaper elsewhere but have no real assurance that they've only been filled with 100% argon. If it were filled 75 25 before, and bleed empty, traces of the other gas would remain. How worried would I have to be about contamination while welding if it was then refilled with 100% argon?
07-20-2007, 01:26 AM
#3
0.5 BAR
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Join Date: Feb 2007
Posts: 96
Re: Used gas cylinders
Nah, I've been on the site for awhile just reading and the likes. I was just curious because the welding supply shop guy was talking how once a tank was filled with another gas it is contamintated, which makes sense. So the small amount of trace gas shouldn't have an adverse effect contaminating the weld?
07-20-2007, 06:57 AM
#7
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Join Date: Oct 2005
Location: St. Augustine FL
Posts: 3,936
Re: Used gas cylinders
they dont change what goes in the bottles. if the bottle originally came with 100% argon it will always be filled with 100% argon. and if you can find a "tractor supply co." (thats the store name) their refils are super cheap compared to welding shops.
07-20-2007, 10:58 AM
#8
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Re: Used gas cylinders
Originally Posted by PhilStubbs
they dont change what goes in the bottles. if the bottle originally came with 100% argon it will always be filled with 100% argon. and if you can find a "tractor supply co." (thats the store name) their refils are super cheap compared to welding shops.
07-20-2007, 12:19 PM
#10
0.5 BAR
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Join Date: Feb 2007
Posts: 96
Re: Used gas cylinders
I can't really trade in the bottle for a new one since I was planning on getting a 55cu tank for around $80 empty. The place where I'd be going to fill it only has 100% argon tanks of 20cu (for around $100 filled) and an 90cu or 110cu (i forget which one) for around $220'ish. Therefor I can't sign up for there exchange program for $7 dollars a year, meaning if I wasn the tank filled all the way up there is a 1 week turn around as they ship it out. Yet, I'd just figure I could have it transfilled there which would take only a couple minutes, and I'm only paying for the gas so if it isn't filled all the way up I don't really care since they are only 4 miles away and the tank would be fairly easy to lug around. I do have a tractor supply company a hundred yards away from the welding supply place. 
I thought they only sold a 40 cu tank, and Ihad no idea they filled or exhanged tanks.?
I thought they only sold a 40 cu tank, and Ihad no idea they filled or exhanged tanks.?
