Originally Posted by
TiHabanero
Do o2 concentrators really affect frame building cost or is simply a matter of being able to produce the o2 needed at a super low cost after the machine has been paid off via cost savings?
I ask because I built 5 frames, replaced 1 down tube, two drop outs, brazed up a fork, and cut down a square tubed basketball pole all on a single tank of o2. Tank size is 80 cubic feet. Just recently had it filled as it was about 80% empty. The acetylene tank of the same size needs a refill as it is empty.
Those looking for brazing equipment advice are typically someone new to framebuilding and wanting to know what to get that might work best. For them getting a concentrator is probably a bit cheaper (and maybe al lot cheaper) than buying an oxygen tank and regular. And then of course they get an endless supply just on the cost of electricity. For you it would just be a matter of convenience. Taking the regulator off and putting the tank into your vehicle and driving to where the WSS is located and then setting it up back in the shop again may not be someone's idea of a good time. In the past I had to run down to South Bend almost a half hour away during 9 to 5 business hours. In your cost analysis you would have to include gas and lost working hours too.
One of the primary reasons I suggested switching to propane and a concentrator is because of regulations. Welding supply stores in bigger cities won't deliver to residential areas (and sometimes won't let you transport the bottles yourself), insurance regulations can be restrictive, etc. And some wives/partners don't like the idea of that hazard near them. Propane is a LOT cheaper and far more convenient to buy anytime. Of course going with propane means getting propane mixers and tips for best results.