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Proper welding rod for 4140N

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Super-eze

Member
Joined
Jan 19, 2011
Messages
5
Location
Cape Coral, Florida
When welding 4130N using the TIG process which rod is preferred, ER80S-D2 or ER70S-2? I am about to begin welding my custom fuselage frame and I am leaning toward the ER70S-2. There are many opinions on the internet by most discussions revolve around auto racing frames and not aircraft. For those who have welded their frames what are your thoughts?

4130N tube specs are .035 WT and .75 OD
 
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