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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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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