Sorry Sum - have to totally disagree with that one - the oxy in the welding kits has some very harmful particles, will absolutley ruin your lungs - this type of oxy is not manufactured the same as hospital oxy - had a paramedic chew my azz apart when I was a kid years back when I did this on a job site. Damn near got fired for it - then again I did not really do the research - just took the medics word for it.
Listen to Jenkie he has many years experience in this matter!