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Old 10-21-2009, 02:30 PM
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Default Non fusible weld backing

I've heard several times over the years about non fusing weld backing used to hold weld beads in a specific shape. Some are carbon rods used to built up worn holes in hitches, some are copper based used to prevent blow through on root passes.

Can I do this to build up an edge with hard surfacing rod? Can I use squashed water pipe? would it be thick enough, or would I have to fold it over to get more mass?

I have more questions than answers at this point...
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Old 10-21-2009, 04:02 PM
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Back when I built things that went bang, we used copper bars and water cooled aluminum dams. The water pipe may be too thin. Even folding it multiple times the first layer will get overheated and most likely melt into your weld. I have melted mashed down pipe just running .035 wire on 22 guage.
Shorter of breath and one day closer to death.....
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Old 10-21-2009, 04:03 PM
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Anything non-ferrous will work, as long as it doesnt contaminate the weld.

Wood would work, but it burns and contaminates, so dont use it.

The thicker the better, it soaks up the heat and helps when welding thin stuff.

Also it wont get as hot as the sun too soon...use pliers or vise-grips, you'll need them. or keep a bucket of water very close so you can toss it in. Alum or brass gets hotter, quicker than you would think and it will surprise you...
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Old 10-21-2009, 04:03 PM
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I don't know why you could not use flattened copper pipe. The only thing would be is if you wanted the back side of the weld to be perfectly flat, you may have a problem if there are wrinkles from flattening it. Depending on how much heat you will be throwing at it, sometimes thin strips of aluminum will work also. I use pieces cut from a sheet of 1/8" copper, and this has always worked for my purposes.
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Old 10-21-2009, 08:48 PM
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You could try some ceramic weld backing (Google image search the term for lots of pics).

We use it at school, but the stuff we have isn't labeled as it was a donation. Works nicely.

Looks like this stuff:
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