That's the new "Monster rolls". The largest capacity plate rolls in N. America, 8" thick capacity cold and 12" thick hot (1650 deg's)! The articles are under newsroom and there's a picture of the 7" thick heads. There's a 100 ton overhead crane to support the rolls. Then they have their house built 3000 ton head press...
Lanse, back gouging is very common on thick pressure vessels to ensure full penetration with no slag or other impurities. Shells are usually done with a root pass and sometimes a hot pass, followed by sub arc and then the the root pass is gouged out on the other side into the sound weld. Then it is filled up with sub arc. Nozzles coming out the side are usually all done with stick but flux-core may be used more now. They are tacked in place and often braced so they don't move. Then they are welded on the inside and back gouged from the outside into the sound weld. Even after gouging, you have to clean it up real nice with a grinder to get rid of left over carbon. Even though there is about a 30 deg. bevel to get full penetration, it can be trick getting 100% penetration into the weld done from the inside.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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