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What's a better heat-sink... brass or copper?
Posted: Mon Sep 10, 2007 1:57 am
by DoctorCheney223
I am going to reweld another MG42 and a Ultimax and was wondering which of the two is a better heat sink and backing for welding, brass plate or copper plate?
thanks,
Ron
Re: What's a better heat-sink... brass or copper?
Posted: Mon Sep 10, 2007 7:10 am
by bolex
Copper has the better thermal conductivity and therefore will draw the head away better.
FYI:
Copper 226 (high) 112 (low)
Brass 135 (high) 15 (low)
Units are Btu*ft/hr *ft^2 *degree F
Re: What's a better heat-sink... brass or copper?
Posted: Mon Sep 10, 2007 8:30 am
by Pirate
brass has zinc in it and is not good
Re: What's a better heat-sink... brass or copper?
Posted: Thu Sep 13, 2007 7:42 am
by tony
Anyone ever use the heat sink putty you can buy from Eastwood or other welding suppliers? Use it, and the copper backer plate and that should work great.
Re: What's a better heat-sink... brass or copper?
Posted: Thu Sep 13, 2007 2:53 pm
by MGMike
I've got a can of the Cold Shield and some of their copper back-up strips that I'm planning to use. On my BREN weld, I'm also thinking about mashing some copper tube into the internal grooves to cut down on the clean-up inside
MikeD