Bi-Metallic Strip

Steel & Nickel (for example)

...which have different expansion rates for a given rise in ambient temperature. Which when the strips are fixed to each other, at both ends, the different expansion rate causes a force to be applied to the strips. This force causes the arcing effect which is used to operate a microswitch.

Correct; except the two strips are not only attached at the two ends, they must be attached to each other along their entire length.

They are usually steel and copper, looking at coppers prices these now cost a lot more.

Correct.

I like to add one point:

The stronger strip is formed curved and the milder is fixed by "High deformation cold rolling is joining the two original sheets by cold welding" as a straight strip.

On increasing the temperature the stronger strip takes the bend to act as a switch.

Good answer.

Some good answers already. You can learn a lot more about thermostatic bimetals from this handbook : kanthal

http://en.wikipedia.org/wiki/Bimetallic_strip

bi metalic strip are made up of two metal both metals temperature cofft are differant. So if temperature is increased bimetalic strip are bent .High temperature cofft side bent towards low temperature cofft side

Katana sword is very good example of use of by-metal. Very hard edge, but brittle, and soft core wish is soft and flexible.

sorry my bad. wrong component.

Is not the core of the katana the hardened steel and the supporting sandwich outside the soft? or is the multiple folding and forging producing a multiple layered sword with the hardened steel providing the strength and stiffness, and the soft steel allowing the hard steel to be thin enough in section so that it does not break ?

(the edge is hard steel because the soft is removed by the sharpening process)

Katana is more complex than simple laminate. Number of layers are 100's. No 'core' as such. Much is about clay coat and heat treatment technique. My advise; you understand more, before you speak again of this.

Also tell iriot you speak to; Katana has no to do with 'bi-metal' as OP asks.

http://video.google.com/videoplay?docid=-5152452484003970262# http://saw.wikia.com/wiki/Katana http://www.ehow.com/how_5075311_forge-katana.html they foldit in many layers, but in traditional sword they put the hard outer shell over the softer core.

"in traditional sword they put the hard outer shell over the softer core".

No

Is like 'case harden'.

Hacksaw blade idea you misunderstand, mislead you fully after. Forget and study all again.

416T Stainless Steel is Bi-Metal.

It has three layers, stainless steel on the outside with a mild steel middle.

There is also a bi-metal strip in thermostats, with tin on one side and copper on the other, the effect is when the temperature changes it causes the strip to expand and contract differently making the strip to to one side or the other to turn on or off the A/C.

"What compenonents make up Bi-Metallic Strips?"

(assuming that you meant "components")...

Depends on what the bi-metallic strip is used for... and how "closely" it needs to be calibrated.

Are you referring to a bi-metallic SPRING ("actuator"), or bi-metallic thermocouple, or bi-metallic thermometer, or ... ?

What difference does it make? We're never going to hear any more from you on THIS thread, are we...?