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Disc Angle Grinder
What's the best way to cut a steel i beam?
oxygen + mapp gas?
angle grinder with a diamond blade?
angle grinder with a metal cut disk?
it's like this one, but mine is 8 x 5 '':
http://images.search.yahoo.com/search/images/view?back=http%3A%2F%2Fimages.search.yahoo.com%2Fsearch%2Fimages%3Fp%3Di%2Bbeam%26toggle%3D1%26cop%3Dmss%26ei%3DUTF-8%26qp_p%3Dbeam%26imgsz%3Dall%26fr%3Dyfp-t-501%26b%3D21&w=640&h=480&imgurl=www.bdg.nus.edu.sg%2Flabs%2Fstructures%2Fimages%2Fbeam2.jpg&rurl=http%3A%2F%2Fwww.bdg.nus.edu.sg%2Flabs%2Fstructures%2Fbeam.htm&size=36.9kB&name=beam2.jpg&p=i+beam&type=jpeg&no=27&tt=658,434&oid=aa78168af772ef56&ei=UTF-8
It's not under load, I want to size cut it and then weld it.
For a smooth even cut, a well saw will work perfectly on this size of a steel beam. I cut many of them while I was in Structural Engineering graduate school using well saws.
Trying to cut it by torch and/or heating will add stress in the metal when it cools. When you then weld the same area, you add additional stress from heating and cooling a second time. All this heating and cooling will cause a weaker connection (in the steel around the connection and in the weld itself).
Your best bet is a band saw (or as I recommend a well saw which is a type of band saw). The liquid (lubrication in the well) keeps the temperature of the metal and the saw band down. If a well saw is not available, the second best choice is a regular band saw with a blade meant for cutting steel. Make sure to allow the saw to cut slowly with very little pressure. It may take several minutes to cut. But the results will be worth the time.
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