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For a much more detailed article go here
http://www.weldingtipsandtricks.com/tig-weld-basics.html
visit the store and pick up a tig finger http://weldmongerstore.com/
This is part 1 of a series on Tig welding Basics...This will be an ABC, 123, how to tig weld series covering lots of things like tig welders, tig torches, electrodes, techniques, and lots of different metals