unfamiliar tubing

EricR_2

I'm in Colorado Springs, We have an area of town that used Bundy tubing for interior domestic water and baseboard heat lines.

Tim Carlson

radiant tubing

Ran across a radiant tubing that I can't identify? The house was built in 1949. The 1/2" tubing was suspened below floor and painted black. After sanding off the paint expecting copper I found a stainless metalic shine, the product used is not black steel, but it is magnetic,bendable and it does have welded/brazed joints. What might this product be?
Thanks Mark!

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EricR_2

Bundy tubing I think

Anyway thats what we call it, I think it was used during WWII and after. I have been successful in soldering it but it is very touchy to excessive torch heat. If possable use compression couplings to do repairs.
EricR

Alan(CaliforniaRadiant)Forbes

Sounds like

Bundyweld which was made during the war years and is some type of copper/steel composite.

A lot of it was used here in the Bay Area for radiant, but I think most if it has failed by now since it didn't hold up well becuase of the ferrous component.

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Alan(CaliforniaRadiant)Forbes

There you go

Both Eric and I posted at the same time....with the same answer.

I always used to think Bundyweld was a west coast phenomenon or a name the old timers came up with, but I guess it's a true product name.

By the way, Eric: what part of the country are you from?

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Sven

Bundyweld ..

still looks like it is made:

http://www.lapham-hickey.com/Products/SteelTubing.cfm

Check out this tidbit:

"William, double-flaring hard lines is mandantory IF you use std steel brake
line, which is also known as "Bundyweld". Bundyweld is rolled sheet steel that
is furnace- brazed together to make a tube; single-flaring will almost always
split it at the braze line, causing a leak. Double flared bundyweld does not
split. This by the way is '30s technology that was never updated. Conversely,
it is almost impossible to double-flare stainless steel tube because of the
instant work-hardening it does. So for SS, I think single flare is OK- we used
single flares on ss tubing in Lockheed's spacecraft w/no problems. And
remember, bundyweld is the only "official" DOT-certified hard line except for
Pat Mical's Future Auto ss hard lines. Don't know which flare Pat uses. J"