"Martin H. Eastburn" wrote in message
...
Explosive welding.
Simple as that.
Martin

N_Cook wrote:
Interesting , but no further forward. Looks as though these froststats
will
remain froststats. Surprising ping and bounce as much as six inches on
change of state, the loud ping is somewhat damped when inside the casing.
Need freezer spray to change the state of these discs (hysteresis and all
that). When back to body temp I tried grinding a spot in the centre of
the
concave side, no change in set temp. Tried 4 diametrical marks on the
concave side , no change in response. Tried deeper but small 8 cuts just
on
the perphery, now no ping but slowly migrates from one state to the other
,
still requiring freezer spray. I wonder how they "weld" these 2 materials
together.


(sorry for the digression.)
huh! yesterday i was going to ask how they make copper clad stainless steel
cookware but i thought it was too dumb and too trivial a question to ask.
couple days ago i had a copper clad stainless pan delaminate the copper
cladding and was stunned. made me wonder how they attach it in the first
place. i'm guessing some sort of furnace brazing process(?). this pan is
probably over 50 years old, i think this is one of the pans my mother got as
a wedding present in the 50's. i've seen stuff (on tv and in books) about
explosive welding but am totally assuming that's NOT how they make copper
clad cookware.

http://www.frontiernet.net/~wwixon/delamination.jpg

b.w.