CWB MODULE 23 CORRECT 100%
Brass is made up of what two metals? - ANSWERcopper and zinc
0-40% Zinc is good for cold working
40-60% Zinc is good for hot working
Bronze is made by mixing which two elements? - ANSWERcopper and tin (phosphorus)
Magnesium forming operations are always carried out hot or cold? - ANSWERHOT
How many elements generally make up Magnesium alloys - ANSWERAt least 2 other
elements
What is the metastable phase of carbon in iron - ANSWERIron Carbide
with regards to cast iron what are phosphorus and Sulphur regarded as -
ANSWERImpurities
Cast with pearlite matrix requires a _____________ preheat than one with a ferretic
matrix - ANSWERHigher
Magnesium is highly reactive & Sensitive to Cracking! What is good practice when
welding - ANSWERGood surface cleaning is essential
What % of Zinc makes Magnesium very crack sensitive and what element improves
crack resistance - ANSWER>5% / Thorium
Titanium is usually welded where - ANSWERIn a chamber
Why is cast iron good for castings - ANSWERMelting point is lower than steel
Cast iron is made how - ANSWERre-melting pig iron
What can be added to cast iron to control the formation of pearlite by increasing the
hardenability of the metal. - ANSWERNickel
In Cast iron if steel is used as a filler, dilution must be kept _________ to minimize
pickup of _____________ - ANSWERLow / Carbon
Brass is made up of what two metals? - ANSWERcopper and zinc
0-40% Zinc is good for cold working
40-60% Zinc is good for hot working
Bronze is made by mixing which two elements? - ANSWERcopper and tin (phosphorus)
Magnesium forming operations are always carried out hot or cold? - ANSWERHOT
How many elements generally make up Magnesium alloys - ANSWERAt least 2 other
elements
What is the metastable phase of carbon in iron - ANSWERIron Carbide
with regards to cast iron what are phosphorus and Sulphur regarded as -
ANSWERImpurities
Cast with pearlite matrix requires a _____________ preheat than one with a ferretic
matrix - ANSWERHigher
Magnesium is highly reactive & Sensitive to Cracking! What is good practice when
welding - ANSWERGood surface cleaning is essential
What % of Zinc makes Magnesium very crack sensitive and what element improves
crack resistance - ANSWER>5% / Thorium
Titanium is usually welded where - ANSWERIn a chamber
Why is cast iron good for castings - ANSWERMelting point is lower than steel
Cast iron is made how - ANSWERre-melting pig iron
What can be added to cast iron to control the formation of pearlite by increasing the
hardenability of the metal. - ANSWERNickel
In Cast iron if steel is used as a filler, dilution must be kept _________ to minimize
pickup of _____________ - ANSWERLow / Carbon
