CBJ Metal Properties and Alloys 3

Question 1

What is work hardening in metalworking?

Accepted Answer

Hardening through repeated mechanical deformation

Answer

Work hardening occurs when repeated bending or hammering disrupts the metal's crystal structure, making it harder and less ductile.

Question 2

What is the primary purpose of annealing metal during jewelry fabrication?

Accepted Answer

To relieve internal stress and restore ductility

Answer

Annealing involves heating metal to relieve stress and restore ductility that has been lost through work hardening.

Question 3

What color should sterling silver glow during annealing to indicate proper temperature?

Accepted Answer

Dull red

Answer

Sterling silver should reach a dull red glow during annealing, indicating it has reached approximately 1,100–1,200°F.

Question 4

What is 'pickle' used for in jewelry making?

Accepted Answer

An acid solution that removes oxidation after soldering

Answer

Pickle is an acidic solution that removes flux residue and oxidation (firescale) from metal after soldering or annealing.

Question 5

Which process deposits a thin metal layer onto a jewelry piece using electrical current?

Accepted Answer

Electroplating

Answer

Electroplating uses an electrical current to bond a thin metal layer—such as rhodium, gold, or silver—to the surface of a jewelry piece.

(CBJ) Certified Bench Jeweler Practice Test