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Jul 21st, 2025 | | | | Joined: Jul 2011 Posts: 55 Wrench Fetcher | | Wrench Fetcher Joined: Jul 2011 Posts: 55 | Okay here is a stupid question. On my '37 one of the hood pieces is forming a crack. Is there any way to get ahead of this before is cracks all the way?
Also I have other folds and cracks that are quite brittle is there a way to soften or relax the metal?
Thanks for any advice you can provide>
Eric | | | | | Joined: Aug 2005 Posts: 6,383 Ex Hall Monitor | | Ex Hall Monitor Joined: Aug 2005 Posts: 6,383 | Stop drill it. What causes it to propagate is the stress riser at the end of the crack. Drill a hole at the end of the crack to eliminate the stress riser. Stress Riser Stop Drilling
Last edited by Tiny; 10/26/2011 12:03 AM.
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| | | | | Joined: Oct 2006 Posts: 9,671 'Bolter | | 'Bolter Joined: Oct 2006 Posts: 9,671 | What Richard says Eric. And then you can weld up the crack.
To anneal the metal you can heat it to a cherry red and hold it there for a few minutes then let it cool down slowly in still air, would also help if you could cover it with a high temp blanket so it cooled down slowly.
Of course if your dealing with a sheet metal hood panel chances are heating it is going to distort or warp it. You may just be dealing with fatigue cracks which doesn't mean the metal is hard. The metal would have to have been hammerd a lot to get it to work harden, in which case again, you could anneal it.
Denny Graham
Sanwi
Denny G
Sandwich, IL
| | | | | Joined: Jul 2011 Posts: 55 Wrench Fetcher | | Wrench Fetcher Joined: Jul 2011 Posts: 55 | Thanks for the help. There is some good information there. This should help me get ahead of this thing. | | | | | Joined: Mar 2008 Posts: 3,750 'Bolter | | 'Bolter Joined: Mar 2008 Posts: 3,750 | Thanks for the help. There is some good information there. This should help me get ahead of this thing. You're right Eric,good info from the guys, thankfully my trucks PO had the foresight to stop drill a couple of cracks on my fender lips and it does work. I also use a similar technique on laminated glass windshields.
1950 Chevy Advance Design 3100 in ScotlandIn the Stovebolt GalleryMore pix on Flickr. I've definately got this truck thing in my blood ... my DNA sequence has torque settings"Of all the small nations of this earth,perhaps only the ancient Greeks surpass the Scots in their contribution to mankind" Winston Churchill.
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