Bought a 3x6 ft welded steel work table at an auction for $5. Welded on four 650 lbs casters ($20) in about 10 minutes. Advertised as "work/welding table on casters". It is actually nice and can be used for storing a lot of stuff on the bottom shelf in addition to working on the table top. A big plus is that it can be moved around loaded. Sold for $110 on eBay via Buy It Now in 12 hours. Customer comes in with a Suburban. Table does not fit into the Suburban. I have to grind off the welds and remove the casters. Buyer finally pushes the now casterless table into the Suburban.
So, in a way, this was first money made by welding, though the customer received the item as if it was never welded.
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