EMAE 160 FINAL QUESTIONS -
LECTURE 5 (WELDING, BRAZING, AND
ADHESIVES) COMPLETE ANSWERS
How do brazing and soldering differ from the fusion welding process? - ANSWER-
Brazing/soldering: no melting of the base metal occurs (weak procedure since more
prone to adhesion failure)
Fusion welding: dissimilar metals can be joined in welding
List some advantages of stud welding. - ANSWER-1. fast attachment
2. no reverse marking
3. welded joint is stronger than the parent material/stud
4. access is only required from one side
5. no holes thus no leaking or weakening of sheet
List some advantages of FCAW. (vs MIG SMAW) - ANSWER-1. no shielding gas
needed
2. less precleaning
3. high deposition rate
4. not as much experience needed to perform
Two types of welding? - ANSWER-1. solid state (heat + pressure)
2. fusion (melting)
OAW (Oxyacetylene welding) commonly used for? - ANSWER-heat source, cutting,
brazing, forging, field repairs
Preheat/postheat...Why? - ANSWER-Preheat: drive away moisture from weld area to
avoid cracking and to lower thermal gradient
Postheat: release residual stresses from completed weld
What is a weldment? - ANSWER-unit composed of an assembly of pieces welded
together
Expected tolerances for welding? - ANSWER-1A
Lenses for arc welding? Skin protection? - ANSWER-eyes: level 10 darkness lens
(minimum)
skin: welding gloves 6 inches above the wrist and welding leathers (apron like jacket)
Capillary action for brazing/soldering? Heat direction? - ANSWER-Capillary action:
ability to draw liquid up against the force of gravity
Filler metal is drawn into space between work pieces towards heat
Differences between soldering (S), hard soldering (H), and brazing (B)? - ANSWER-
S =< 800F
B => 800F, rods are touched to the joint while being heated
LECTURE 5 (WELDING, BRAZING, AND
ADHESIVES) COMPLETE ANSWERS
How do brazing and soldering differ from the fusion welding process? - ANSWER-
Brazing/soldering: no melting of the base metal occurs (weak procedure since more
prone to adhesion failure)
Fusion welding: dissimilar metals can be joined in welding
List some advantages of stud welding. - ANSWER-1. fast attachment
2. no reverse marking
3. welded joint is stronger than the parent material/stud
4. access is only required from one side
5. no holes thus no leaking or weakening of sheet
List some advantages of FCAW. (vs MIG SMAW) - ANSWER-1. no shielding gas
needed
2. less precleaning
3. high deposition rate
4. not as much experience needed to perform
Two types of welding? - ANSWER-1. solid state (heat + pressure)
2. fusion (melting)
OAW (Oxyacetylene welding) commonly used for? - ANSWER-heat source, cutting,
brazing, forging, field repairs
Preheat/postheat...Why? - ANSWER-Preheat: drive away moisture from weld area to
avoid cracking and to lower thermal gradient
Postheat: release residual stresses from completed weld
What is a weldment? - ANSWER-unit composed of an assembly of pieces welded
together
Expected tolerances for welding? - ANSWER-1A
Lenses for arc welding? Skin protection? - ANSWER-eyes: level 10 darkness lens
(minimum)
skin: welding gloves 6 inches above the wrist and welding leathers (apron like jacket)
Capillary action for brazing/soldering? Heat direction? - ANSWER-Capillary action:
ability to draw liquid up against the force of gravity
Filler metal is drawn into space between work pieces towards heat
Differences between soldering (S), hard soldering (H), and brazing (B)? - ANSWER-
S =< 800F
B => 800F, rods are touched to the joint while being heated
