I want to weld to the central axle disconnect but I'm not sure yet if it is steel or cast iron.
Does anybody know, or has anybody welded to this section?

 

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Its Aluminum, I'm pretty sure. Stick a magnet on it....

Why the hell would you want to weld it? Its removable for a reason.

 

Purpl I believe he's talking about the housing.
Which when I drilled and tapped it last fall it appeared to be Cast Iron.

 

Alternatives:

- Posi-lok permanent CAD engagment
http://tal4x4.com/prod_purchase.php?kid=1424&gid=-1

- Cable Operated
http://tal4x4.com/prod_purchase.php?kid=1422&gid=-1

Posi-lok's website has a little more information, but tal4x4.com is the cheapest I've seen it. There's also a replacement passenger side axle, without the CAD, but I don't have the link available at the moment.

 

Yup, the housing is what I'm talking about, not the cover. I'm using the axle for another build and want to attach a 3rd link mount to the cover if possible (steel).
I'm not going to bother if it's cast iron.