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http://www.lincolnelectric.com/en-us/support/welding-how-to/Pages/tig-welding-aluminum-detail.asp&xgthttp://www.lincolnelectric.com/en-us/support/welding-how-to/Pages/tig-welding-aluminum-detail.asp&xgthttp://www.praxair.com/industries/welding-and-metal-fabrication#%21tab=related-gases/