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Tool Talk Discussion Forum

Argon gauge

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dr.sportster

09-27-2006 19:25:58




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Changed to a new bottle of argon tonight and when I turned it on the pressure releif on the gauge blew open.I took it out and cleaned it and it still did it.Then I turned the valve on the bottle only slightly open but when welding I ran out of gas pressure.Cracked it a little more and ran the gas at 40 CFM so it would stop the check valve [which was now chattering open and closed].Did I just get an overfull bottle or something?I also ran a fan right away to avoid any chance of argon suffocation.Pressure releif says" Do not tamper 60"on it.

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T_Bone

09-28-2006 05:21:45




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 Re: Argon gauge in reply to dr.sportster, 09-27-2006 19:25:58  
Hi Dr.S,

Most flowmeters that I've used are very sensitive to gas shock on the secondary side. Meaning if you open the cylinder valve too fast it'll blow the diaphram out. Backing off the secondary flow regulation valve before opening the cylinder valve will stop this.

I nailed my acetylene gauge early this summer because I wasn't watching what I was doing plus the summer heat on the cylinder.

I guess it's possible to get a over filled cylinder but highly unlikely. Even in AZ I've never seen a cylinder pop on the relief if the gauge is good shape. Could be just your time to rebuild/replace the flowmeter for $60.

T_Bone

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Steve Crum

09-27-2006 20:38:48




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 Re: Argon gauge in reply to dr.sportster, 09-27-2006 19:25:58  
I use L-Tec regulators and flow meters on my TIG welders and have popped a few of the burst disks in the top of the flow meters. Usually the result of a sticking regulator (mine are not adjustable for pressure). I replace the burst disk with a like size disk cut with a hollow punch with .002" steel shim stock. I know IS THIS SAFE? Well the first and last flowmeter I had "rebuilt" because of this cost $75. I've popped 2 of the home made disks in the past 14 years with no damage to the flow meter. Usually what causes the regulator to stick is some crud from the tank valve (mud daubers usually) that doesn't get cleaned out before putting the regulator on the tank. This nesesatates taking the regulator apart and cleaning it out. These regulators when working correctly, only flow on demand. When you stop the flow at the welder or at the TIG stinger the regulator stops the flow. (unless it has some crud in it).

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oldRoy

09-27-2006 19:57:55




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 Re: Argon gauge in reply to dr.sportster, 09-27-2006 19:25:58  
Most pressure relief valves are a one time shot, forcing you to rebuild a malfuctioning regulator. Sometimes a tank is over-
filled by several hundred lbs causing the pressure relief to 'nuisance' blow. All the ones I am familiar with have a thin metal disc that needs to be replaced. Wow, 40 cfm is a lot of gas velocity for normal welding.



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