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How to do it? In earlier versions, there was a check box that allowed you to use a Material for welding. Where is the equivalent in Inventor 2013? Inquiring minds, and all that...
(and how did an amateur like me become a "Distinguished Contributor"?)
You seem to have discovered a defect here; could you please post your data here so that Dev can investigate this further ? This seems like a good candidate for a hotfix.
Finding issues like this & discussing them here & making contributions to other discussion make you "Distinguished" & obviously it's appreciated...
Many Thanks,
Chris