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TIG Questions

Beej

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I am having a guy come in to TIG my I-struts in situ [I daren't gas em in situ..burnt ribs etc]. I am currently working out how to clamp the 3/4bracing tubes so he can just walk in and tack weld then remove the clamping. One of the tubes I am having trouble clamping, I don't know how TIG works, so, can I hold a tube in place while he tacks it? Or does a current run through the steel?


Also, what is the typicalsteel prep for TIG welding?


What welding rod do I need to ensure he's using?
 

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