CD CD Drafter Materials & Manufacturing Processes 2 — Questions and Answers
Question 1: What is the primary purpose of a material callout note in the title block of a drawing?
- To specify the material from which the part must be fabricated (Correct answer)
- To indicate the surface finish requirement
- To describe the heat treatment process
- To list approved vendors
Correct answer: To specify the material from which the part must be fabricated
The material callout in the title block tells the manufacturer exactly what material or alloy to use when fabricating the part.
Question 2: Aluminum alloy 6061-T6 — what does 'T6' designate?
- Solution heat-treated and artificially aged (Correct answer)
- Annealed temper
- Cold worked
- As-fabricated
Correct answer: Solution heat-treated and artificially aged
T6 temper means the aluminum was solution heat-treated and then artificially aged to achieve maximum strength.
Question 3: Which process joins two metal parts using a filler metal with a melting point above 840°F (450°C) but below the base metal melting point?
- Brazing (Correct answer)
- Soldering
- Welding
- Adhesive bonding
Correct answer: Brazing
Brazing uses a filler metal that melts above 840°F but below the base metal, creating a strong joint by capillary action.
Question 4: On a drawing, the note 'ASTM A36' refers to:
- A structural carbon steel specification (Correct answer)
- An aluminum alloy designation
- A stainless steel grade
- A plastics material standard
Correct answer: A structural carbon steel specification
ASTM A36 is a widely used structural carbon steel standard specifying minimum yield strength of 36 ksi.
Question 5: Which manufacturing process is best suited for producing complex internal shapes that cannot be machined?
- Sand casting (Correct answer)
- CNC milling
- Extrusion
- Sheet metal forming
Correct answer: Sand casting
Sand casting can produce complex internal cavities using sand cores placed inside the mold.
Question 6: What property of a material is measured by the Rockwell or Brinell test?
- Hardness (Correct answer)
- Tensile strength
- Yield strength
- Ductility
Correct answer: Hardness
Rockwell and Brinell tests measure hardness by pressing an indenter into the material surface and measuring the indentation depth or diameter.
CD CD Drafter Materials & Manufacturing Processes 2
What is the primary purpose of a material callout note in the title block of a drawing?