In welding process, the melting point of the filler metal that is solder or any alloy is______.

In welding process, the melting point of the filler metal that is solder or any alloy is______.

a. lower than the melting point of the metals being joined
b. same as the melting point of the metals being joined
c. more than the melting point of the metals being joined
d. does not matter

Correct Answer : a. lower than the melting point of the metals being joined

Explanation :

In joining process, the filler material should have the lower melting point than that of the metals being joined so that the filler material can stick to both the metals wich are to be joined.