"Baron" wrote in message
...
whit3rd wrote:

On Nov 8, 6:56 pm, "Martin H. Eastburn"
wrote:

N_Cook wrote:
I wonder how they "weld" these 2 materials
together.

Explosive welding.
Simple as that.

This might be the correct answer, but there are fill-metal/reducing
atmosphere/heat solutions that might do a kind of brazing for lower
cost
if you get the materials right. Explosive welding is used for US
coins
because it was possible to mimic the electromagnetic properties of
silver well enough to keep lots of vending machines in service.
I've gotta believe the requirements for a thermostat bimetal system
are loose enough to allow for alloys that don't require explosive
welds.

I was under the impression that two sheets of material were hot rolled
together and the discs just stamped out complete with the dome shape.

--
Best Regards:
Baron.




how about instead of removing material from the flat surface of the dome to
remove material around the outside diameter? would that alter the point at
which the dome went PING? i was just wondering if the outside edge is
constrained in a bezel, if there was more room to expand there if that would
alter it's temperature rating?

b.w.

On Mon, 9 Nov 2009 16:13:19 -0600, "William Wixon"
wrote:




how about instead of removing material from the flat surface of the dome to
remove material around the outside diameter? would that alter the point at
which the dome went PING? i was just wondering if the outside edge is
constrained in a bezel, if there was more room to expand there if that would
alter it's temperature rating?

b.w.


If there were room, one could add a preload spring to change the set point.

Mark Rand
RTFM