Ignoramus28895 fired this volley in news:Iemdncf4CYkj6nrSnZ2dnUVZ email@example.com:
'Had a guy come and salvage three old Conex boxes that had rusted too far for us to use as magazines. 40' "high cube"... 8x40x101"
He had an old Victor about three feet long with a huge cutting tip. He ran oxy-propane, and cut the hell out of those three boxes; in about three working days, he had all of them reduced to 6x10 scraps that fit his trailer.
As a child, my cousins cut up steel to make prepared grade for the price improvement. They used a BIG torch, propane and an air compressor. I tried it and couldn't make it work well. Must be a trick to it.
How thick & how portable does it need to be? If not too thick/portable, plasma might be cost effective (avoid buying gases). But there is the up-front cost. And doing-the-numbers might be hard: how would you figure the cost of cutting a unit area with gas and with plasma?
The local yard cuts up large oil field castings that went wrong or large large gears. They have an on-site LOX machine and feed tanks for the large lance.
The guy in a space suit - all metal - and massive gloves.
He would have a hole with paper and oil. Light it with a propane torch and toss it aside.
Pick up the lance, tested the LOX (valve at the end of the lance) and swing it into the fire - trying to and igniting the lance.
I'd like to say it was front loaded with magnesium which got white hot fast. Then adding LOX and singing it onto steel. It would slice nicely - some catches with the massive flow of cut metal. A crane would lift the work high and drop it - and the torch when to work on what wasn't broken into a certain size.
They got to sell the 'free' scrap back to the foundry. The cost of busines was balanced well - free metal, spend money on it - delivery it and get paid.
I got to watch while checking out the lot for metal to buy.