Try welding as Joe said with the wet rags. Also one other idea, you said you used JB Weld and it held for a little while. I have used Marine Tex epoxy to fix a few things over the years. It can withstand heat, oil and gas. You can paint it, machine it drill and tap it if needed. Costs about $10 and it is worth a try.

 

to be honest it all depends on the chrome... some will never blue, others will blue at 500*... i will say, that if it can be done, Tim here in the shop can do it.

 

Looks like it's a no-go.

I tested it out on a chrome spare part I had laying around the garage. Even the smallest tack weld showed through onto the chrome on the other side. Since I couldn't get it to work on a test piece I'm not going to risk ruining the heat shield.

I'm going to try the Marine Tex epoxy and if that doesn't work, then I'll look into a replacement or re-chroming...

 

what kind of welding setup did you have? did you give it a cool backing? we have done this that is why i am asking