Deck 27: Brazing, Soldering, and Adhesive Bonding

Question 1

In brazing, the base metals melt at temperatures above 840 $\degree$ (450 $\degree$ C) while in soldering they melt at 840 $\degree$ F (450 $\degree$ C) or below:

Answer 1

False

Question 2

The most common types of brazed joints are which two of the following:

A)butt
B)corner
C)edge
D)lap
E)tee

Answer 2

butt
lap

Question 3

The strength of a brazed joint is typically

A)equal to
B)stronger than
C)weaker than the filler metal out of which it is made

Answer 3

stronger than

Question 4

Scarfing in the brazing of a butt joint involves the wrapping of a sheath around the two parts to be joined to contain the molten filler metal during the heating process:

Question 5

Best clearances between surfaces in brazing are which one of the following ranges:

A)0.0025-0.025 mm (0.0001-0.001 in.)
B)0.025-0.250 mm (0.001-0.010 in.)
C)0.250-2.50 mm (0.010-0.100 in.)
D)2.5-5.0 mm (0.10-0.20 in.)

Question 6

Which of the following are advantages of brazing compared to fusion welding (three best answers):

A)annealing of the base parts is a by-product of the process
B)dissimilar metals can be joined
C)less heat and energy required
D)metallurgical improvements in the base metals
E)multiple joints can be brazed simultaneously
F)parts can be readily disassembled
G)stronger joint than welding

Question 7

Braze welding derives its name from the fact that some melting of the base metals occur, as in fusion welding:

Question 8

Which of the following soldering methods are not used for brazing (two correct answers):

A)dip soldering
B)infrared soldering
C)soldering iron
D)torch soldering
E)wave soldering?

Question 9

Which one of the following is not a function of a flux in brazing or soldering:

A)chemically etch the surfaces to increase roughness for better adhesion of the filler metal
B)promote wetting of the surfaces
C)protect the faying surfaces during the process
D)remove or inhibit formation of oxide films

Question 10

Which of the following metals are used in solder alloys (four correct answers):

A)aluminum
B)antimony
C)gold
D)iron
E)lead
F)nickel
G)silver
H)tin
I)titanium

Question 11

A soldering gun is used to inject molten solder metal into the joint area when the trigger is pulled:

Question 12

Wave soldering is used in the production of which one of the following products and/or assemblies:

A)beach balls
B)children's toys
C)plumbing fixtures
D)printed circuit board assemblies
E)surfboards
F)twisted wires

Question 13

In adhesive bonding, which one of the following is the term used for the parts that are joined:

A)adherend
B)adherent
C)adhesive
D)adhibit
E)ad infinitum

Question 14

Weldbonding is an adhesive joining method in which heat is used to melt the adhesive:

Question 15

Adhesively bonded joints are strongest under which type of stresses (two best answers):

A)cleavage
B)peeling
C)shear
D)tension

Question 16

Roughening the faying surfaces tends to

A)have no effect on
B)increase
C)reduce the strength of an adhesively bonded joint