A Bimetallic strip is used to convert a temperature change into mechanical displacement. The strip consists of two strips of different metals which expand at different rates as they are heated, usually steel and copper , or in some cases steel and brass . The strips are joined together throughout their length by riveting , brazing or welding . The different expansions force the flat strip to bend one way if heated, and in the opposite direction if cooled below its initial temperature. The metal with the higher coefficient of thermal expansion is on the outer side of the curve when the strip is heated and on the inner side when cooled So as I said in the definition it consist of two strip of metal, an electric switch and heat source. How it functions: As you can see the two metal are attached to each other so whenever we apply heat source to one side of the metal it will expand in length to reach the electric switch to close the circuit and vice versa so that when the source of heat starts to decrease it will open the circuit and return to its original shape. For example the iron that we use to straighten the clothes we hear TIK voice when the red light shows and another TIK when the red light disappear which indicates that the circuit is closed or open
ABimetallic stripis used to convert a temperature change into
mechanical displacement. The strip consists of two strips of
different metals which expand at different rates as they are
heated, usuallysteelandcopper, or in some cases steel and brass.
The strips are joined together throughout their length
byriveting,brazingorwelding. The different expansions force the
flat strip to bend one way if heated, and in the opposite direction
if cooled below its initial temperature. The metal with the
highercoefficient of thermal expansionis on the outer side of the
curve when the strip is heated and on the inner side when cooledSo
as I said in the definition it consist of two strip of metal, an
electric switch and heat source.
How it functions:As you can see the two metal are attached to
each other so whenever we apply heat source to one side of the
metal it will expand in length to reach the electric switch to
close the circuit and vice versa so that when the source of heat
starts to decrease it will open the circuit and return to its
original shape.
For example the iron that we use to straighten the clothes we
hear TIK voice when the red light shows and another TIK when the
red light disappear which indicates that the circuit is closed or
open
