Why? If you run out, you run out. Oxygen not a big deal but with some cylinders, especially shielding gas, you don't want to run out in the middle of a weld. Usually on shielding gas cylinders you replace them when the pressure is below 100 PSI. There are some cylinders that say on them to leave at least 25 PSI in. I think it's so they don't get contaminated but the proper procedure for filling cylinders, especially argon, is to purge the cylinder before filling it so you are guaranteed 100% pure argon. It is very noticeable when welding aluminum if you have dirty argon. Sometimes the guy filling it is in a hurry or too lazy to purge the cylinders. Cylinders are also routinely switched from one type of gas to another.
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