If your welding something like a trailer or skid in place, it helps to do the vertical welds first, then top and bottom. Of course jumping around so all the heat isn't in the same place. I built a lot of big skids and they were turned so all the welding was done flat or horizontal. They all warped downward. To straighten them, we flipped them upside down and applied heat to the main beams at the I beam cross members in the middle. They were sitting on short pieces of I beam blocks at the corners, the same as when they were first started. After heating the finished skid, they straightened right out. Some of the skids weighed 10 tons.
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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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