AE 210 TEST WITH COMPLETE SOLUTION
Purposes of heat treatment - ANSWER -soften the metal before forming
-relieve strain hardening
-strengthen & harden metal
Annealing (Why?) - ANSWER -Heating and soaking a metal then slowly cooling
-reduce hardness & brittleness
-soften metal
recrystallize metal
3 steps in precipitation hardening - ANSWER -solution treatment- heated into alpha
phase
-quenching- brought to room temp to solidify
-precipitation treatment- heated below alpha to cause precipitation in the beta phase
How does carburizing work? - ANSWER -Heating a low carbon steele in a carbon rich
environment so carbon is diffused into the surface
4 quenching media to produce martenesite - ANSWER salt water, fresh water, still oil,
air
5 joint types - ANSWER butt, lap, tee, corner, edge
Groove weld - ANSWER -refers to beads deposited in a groove between two members
Melting energy in welding & factors - ANSWER -heat to raise temp of a solid metal into
its melting point
-depends on metals volumetric specific heat
Heat transfer factor/melting factor (efficiency) - ANSWER -Heat transfer= actual
heat/heat generated
-melting- heat received at a surface used for melting
Advantages & disadvantages of welding - ANSWER AD
-economical for materials
-permanent joint
, -not restricted to factory workplace
DA
-manual
-expensive labor
-dangerous
4 zones in cross section for fusion weld joint - ANSWER fusion zone, weld interface, heat
affected zone, unaffected base metal zone
Fusion weld vs. solid state weld - ANSWER fusion weld- has filler metal
solid state- no filler, no melting base metal
What is arc welding & what is an electric arc - ANSWER -fusion welding process
achieved by the heat of an electric arc
-discharge of electric current across a gap in a circuit
Arc welding electrode categories - ANSWER consumable, nonconsumable
Why arc shield & 2 basic methods - ANSWER -to protect the operation
-shielding gases, flux
What is shielded metal arc welding? - ANSWER uses consumable bare metal wire as
electrode
What is gas metal arc welding? What are the advantages over shielded metal arc
welding - ANSWER -uses consumable bare metal wire as electrode with shielded gas
-wire is automatically fed, less slag, higher arc time
Why plasma air welding can achieve a higher temp than arc welding - ANSWER
constriction of arc causing a small plasma jet with very high power density
Advantages & disadvantages of plasma air welding - ANSWER AD
-good arc stability
-excellent weld quality
DA
-high equip cost
-restricted access in some joints
Why acetyline is the most popular fuel among OFW - ANSWER capable of higher
Purposes of heat treatment - ANSWER -soften the metal before forming
-relieve strain hardening
-strengthen & harden metal
Annealing (Why?) - ANSWER -Heating and soaking a metal then slowly cooling
-reduce hardness & brittleness
-soften metal
recrystallize metal
3 steps in precipitation hardening - ANSWER -solution treatment- heated into alpha
phase
-quenching- brought to room temp to solidify
-precipitation treatment- heated below alpha to cause precipitation in the beta phase
How does carburizing work? - ANSWER -Heating a low carbon steele in a carbon rich
environment so carbon is diffused into the surface
4 quenching media to produce martenesite - ANSWER salt water, fresh water, still oil,
air
5 joint types - ANSWER butt, lap, tee, corner, edge
Groove weld - ANSWER -refers to beads deposited in a groove between two members
Melting energy in welding & factors - ANSWER -heat to raise temp of a solid metal into
its melting point
-depends on metals volumetric specific heat
Heat transfer factor/melting factor (efficiency) - ANSWER -Heat transfer= actual
heat/heat generated
-melting- heat received at a surface used for melting
Advantages & disadvantages of welding - ANSWER AD
-economical for materials
-permanent joint
, -not restricted to factory workplace
DA
-manual
-expensive labor
-dangerous
4 zones in cross section for fusion weld joint - ANSWER fusion zone, weld interface, heat
affected zone, unaffected base metal zone
Fusion weld vs. solid state weld - ANSWER fusion weld- has filler metal
solid state- no filler, no melting base metal
What is arc welding & what is an electric arc - ANSWER -fusion welding process
achieved by the heat of an electric arc
-discharge of electric current across a gap in a circuit
Arc welding electrode categories - ANSWER consumable, nonconsumable
Why arc shield & 2 basic methods - ANSWER -to protect the operation
-shielding gases, flux
What is shielded metal arc welding? - ANSWER uses consumable bare metal wire as
electrode
What is gas metal arc welding? What are the advantages over shielded metal arc
welding - ANSWER -uses consumable bare metal wire as electrode with shielded gas
-wire is automatically fed, less slag, higher arc time
Why plasma air welding can achieve a higher temp than arc welding - ANSWER
constriction of arc causing a small plasma jet with very high power density
Advantages & disadvantages of plasma air welding - ANSWER AD
-good arc stability
-excellent weld quality
DA
-high equip cost
-restricted access in some joints
Why acetyline is the most popular fuel among OFW - ANSWER capable of higher
