Question

1. When is it desireable to join two metals having like coefficients of linear expansion?

2. When is it desireable to join two metals having unlike coefficients of linear expansion?

please be clear with your answers.

Answer 1

1.  When is it desireable to join two metals having like coefficients of linear expansion?

ANSWER:For some heavy industrial work like building of bridges or any construction purpose or when we are targetting to make some sensitive material like Thermocouple,RTD etc. ,we join two metals that have same coefficient of linear expansion.Because of the fact that linear expansion is heat sensitive and also it depends on the internal molecular arrangements of the molecule,we need to take into account the metals with like coefficient of linear expansion.As we know that the heat sensitive property of the metal directly affects the vibration characteristics of molecules.

2.When is it desireable to join two metals having unlike coefficients of linear expansion?

ANSWER:Coefficient of Linear Expansion states that how the physical and internal arrangement of a particular material changes with change in temperature.That means this coefficient of linear expansion is very heat sensitive.So welding of dissimilar metals (say that they have different coefficient of linear expansion) is done to in this case.While preparing alloy,we generally join two metals that have different(unlike) coefficient of linear expansion.

#HOPE THIS WILL HELP YOU..

#THANK YOU...!!!