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copper or brass as a backer for weld filling?

To: shop-talk@autox.team.net
Subject: copper or brass as a backer for weld filling?
From: Mark Andy <mark@sccaprepared.com>
Date: Wed, 10 Dec 2003 10:37:35 -0500 (EST)
Howdy,

I was talking to a friend yesterday who's a fabricator, and mentioned that 
I was going to be starting to do some sheet metal patching work in the 
racecar to fill up some of the various holes in the firewall, etc.

He mentioned that I should use a chunk of (copper or brass, I can't 
remember) as a backer on holes up to around 3/8" and then I could just 
fill them up against that, the weld metal wouldn't stick to the (copper or 
brass, I can't remember), and it'd leave one side nice and smooth.

I got some copper and some brass...  Which do I use?

Thanks!

Mark





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