The fabrication method that joins together materials, usually metal, is known as
a. casting
c. cutting
b. milling
d. welding

The correct answer is (d.) welding. Welding is a fabrication method that joins together materials, usually metal. by causing fusion. This method melts the materials upon joining it together  for a specific temperature without melting the base metal.

Theoretical temperature at which molecules stop moving and no more heat can be removed from the object. kelvin: absolute zero degrees. none of the above.