Deck 33: Brazing, Braze Welding, and Soldering

Question 1

If a process is ____, the base material or materials are not melted.

A) liquid
B) solid
C) phase bonded
D) welded

Answer 1

B

Question 2

The reactivity of a flux is greatly affected by ____.

A) temperature
B) heat
C) the joining process
D) the base metals

Answer 2

A

Question 3

Which of the following is a function of fluxes used in brazing and soldering?

A) They must prevent wetting.
B) They must discourage capillary action.
C) They must remove oxides that form from heating parts
D) They must encourage oxides to form in the heated parts.

Answer 3

C

Question 4

The compatibility of the base materials to the filler metal will determine the ____.

A) shear strength
B) ductility
C) fatigue resistance
D) corrosion resistance

Question 5

The ____ method of heating uses a high-frequency electrical current to establish a corresponding current on the surface of the part.

A) furnace
B) induction
C) dip
D) resistance

Question 6

What is the paste range of an alloy of 61.9% tin and 38.1% lead?

A) No paste range
B) 12°F
C) 73°F
D) 173°F

Question 7

In the ____ method of soldering and brazing, the entire part must be able to withstand heating without burning.

A) furnace
B) induction
C) dip
D) resistance

Question 8

For a solder or braze joint, the ____ depends on the amount of overlapping area of the base parts.

A) shear strength
B) ductility
C) fatigue resistance
D) corrosion resistance

Question 9

____ relies on capillary action to draw filler metal into the joint, whereas ____ does not need capillary action.

A) Braze welding, brazing
B) Brazing, braze welding
C) Soldering, braze welding
D) Soldering, brazing

Question 10

Brazing fluxes are chemical compounds such as ____.

A) hydrochloric acid
B) sal ammoniac
C) alkalies
D) rosin

Question 11

Which of the following is true of fluxes?

A) They are not reactive at room temperature.
B) If they are overheated they contaminate the joint.
C) They are not able to dissolve surface oxides.
D) Fluxes are able to dissolve oils.

Question 12

Fluxes that are active at room temperature ____.

A) must be neutralized after completing the job
B) cannot be neutralized
C) do not have to be cleaned off the part
D) must only be removed if the part is to be painted

Question 13

Which of the following is true of soldering and brazing fluxes?

A) They will remove dirt and oil.
B) They will remove paint and glues.
C) They eliminate the need for joint cleaning.
D) They will remove light surface oxides.

Question 14

Tin-leads are most commonly used for ____.

A) food handling equipment
B) plumbing
C) commercial pipe production
D) electrical connections

Question 15

In ____ processing, the entire surface of the part can be covered with the filler metal at the same time that it is being joined.

A) furnace
B) induction
C) dip
D) resistance

Question 16

Fluxes that are inactive at room temperature ____.

A) must be neutralized after the job is completed
B) may result in corrosion if left on the part
C) must be removed if the part is to be painted
D) must always be removed

Question 17

The ____ flame has a very high temperature near the inner cone, but it has little heat in the outer flame, resulting in localized overheating.

A) propane
B) butane
C) oxyacetylene
D) natural gas

Question 18

As the joint space decreases, ____.

A) the shear strength decreases
B) the surface tension decreases the tensile strength of the joint
C) the shear strength increases
D) the surface tension increases the tensile strength of the joint

Question 19

For most soldered or brazed joints, ____ is usually fairly low.

A) shear strength
B) ductility
C) fatigue resistance
D) corrosion resistance

Question 20

Soldering fluxes are chemical compounds such as ____.

A) fluorides
B) chlorides
C) boric acids
D) muriatic acid

Question 21

____ is the most commonly used solder in plumbing.

A) Tin-antimony
B) Cadmium-silver
C) Cadmium-zinc
D) Copper-zinc

Question 22

____ has a higher tensile strength and lower creep than the tin-lead solders.

A) Tin-antimony
B) Cadmium-silver
C) Cadmium-zinc
D) Copper-zinc

Question 23

____________________ occurs at a temperature above 840°F.

Question 24

​What is the basis of the series of letters after the letter B in the AWS classification system for brazing alloys.

A) ​It is the abbreviation of the alloy metals that can be brazed with this rod.
B) ​They stand for the initials of the inventor of the alloy.
C) ​They are radially selected by a board at the AWS.
D) ​They are the atomic symbols of the metals that make up the alloy.

Question 25

​Which material cannot be resistance brazed?

A) ​stainless steel
B) ​copper
C) ​ceramics
D) ​aluminum

Question 26

The spacing between the parts being joined greatly affects the ____ of the finished part.

A) shear strength
B) tensile strength
C) fatigue resistance
D) corrosion resistance

Question 27

​What is an advantage of furnace brazing?

A) ​controlled atmosphere
B) ​corrosion protection
C) ​steam explosions
D) ​localized heating

Question 28

____ alloys have excellent wetting, flow, and strength characteristics, but they are expensive.

A) Tin-antimony
B) Cadmium-silver
C) Cadmium-zinc
D) Copper-zinc

Question 29

​Which of the following is an advantage of soldering or brazing?

A) ​speed of joining
B) ​less chance of damaging parts
C) ​low temperature
D) ​All of the Above

Question 30

____________________ takes place at a temperature below 840°F.

Question 31

A process that is ____________________ means that the filler metal is melted.

Question 32

​Versatility, portability, and speed are all advantages of which brazing process?

A) ​torch brazing
B) ​furnace brazing
C) ​induction brazing
D) ​dip brazing

Question 33

The ____________________ is the temperature at which bonding takes place between the solid base material and the liquid filler metal.

Question 34

​The term phos-copper is used to refer to ________________.

A) ​phosphorous brazing rods that are used on copper.
B) ​the type of joint being made using a copper alloy filler rod.
C) ​copper-phosphorus rods
D) ​a filler rod containing phosphate and copper.

Question 35

____________________ is the force that pulls water up into a paper towel or pulls a liquid into a very fine straw.

Question 36

​Which of the following is a form that flux is available as?

A) ​rings
B) ​washers
C) ​sheets
D) ​All of the above

Question 37

​What alloys make up the filler metal BAlSi?

A) ​ammonia and sodium
B) ​alum and sulfer
C) ​aluminum and silicon
D) ​aluminum and silver

Question 38

The strongest joints are obtained when the parts use lap or scarf joints where the joining area is equal to ____ times the thickness of the thinnest joint member.

A) two
B) three
C) four
D) five

Question 39

​Why would a fuel gas be bubbled through a flux container?

A) ​So the flux can be carried to the torch where it combines with the flame.
B) ​To help control the flame temperature.
C) ​It is used to lubricate the valves of the torch.
D) ​All of the above

Question 40

​What metal cannot be joined using silver-copper alloys?

A) ​mild steel
B) ​copper
C) ​stainless steel
D) ​aluminum

Question 41

Summarize the advantages and disadvantages of torch soldering and brazing.

Question 42

Summarize the properties of cadmium-zinc alloys.

Question 43

Summarize the properties of copper-zinc alloys.

Question 44

List the three major functions of fluxes.

Question 45

The ____________________ is the lowest possible melting point of an alloy.

Question 46

The ____________________ strength of a joint is its ability to withstand a force parallel to the joint.

Question 47

The ____________________ of a metal is its ability to be bent repeatedly without exceeding its elastic limit and without failure.

Question 48

Unlike welding or hardsurfacing, ____________________ has no hard spots that make remachining difficult.

Question 49

A(n) ____________________ range is the temperature range in which a metal is partly solid and partly liquid as it is heated or cooled.

Question 50

Summarize the advantages and disadvantages of resistance soldering and brazing.