Welding a stainless steel / alu nut to an aluminium bonnet

[scot-canuck]

So after major hassles brought on by a broken bonnet catch, I've decided to make another grille from stainless mesh,. However instead of being secured on the inside of the bonnet, I want the new fixings to go from the outside inwards so if the cable fails in the future then I can just unscrew the grille and access the catch.
However that opens up a slight issue....needs captive nuts on the inside, which means welding onto a bonnet thats made from aluminium...Any tips or suitable alternatives to welding?

[wrinx]

Riv-nuts to the bonnets supporting frame?

Pics would help to confirm the layout :)

wrinx

[scot-canuck]

I'll get some pics up when I get a sec lol

[Hitch]

Rivnuts.... you don't want to be welding to your bonnet do you!?

Besides the issue of needing aluminum nuts.... you won't weld steel or stainless ones to ally.

How about pop rivets, just drill them out if you need to remove the grille.....

[aeromech3]

I would 2 part resin bond aluminium brackets to the underside of the bonnet, if the SS grill is not too heavy and unlikely to vibrate, then attach to that as above^.

[Grumps]

Ally riv-nuts available here.

http://1stdirectory.co.uk/companies/162 ... et-ltd.htm

Crap website but I called in a few weeks back and they were quite helpful. They specialize in supporting the Kit Car market.