I read somewhere ( I hate those three words to start a response!!) that Trek OX2 True-Temper is the same as Reynolds 853, especially suitable for TIG welding. There is nothing wrong with TIG welding. I don't know where the tubes are made, but Taiwan and China both have super modern facilities now. The 520's are hand made in Wisconsin. They are very good bikes. Personally, I find new bike prices to all be a bit over the top - not just the Treks. I bought a used '98, fully dressed, for $550 and I'm glad to have it. Very rugged bike.