Question 1

Soldering and brazing are a weak way of joining or repairing parts.

Accepted Answer

Soldering and brazing are effective methods of joining or repairing parts. They involve heating and melting a filler material, which then flows into the joint between the parts and solidifies, creating a strong bond. While there are stronger methods of joining, soldering and brazing have their own advantages, such as lower temperatures required and less distortion of the parts being joined.

Question 2

To prevent overheating with an oxyacetylene flame, keep the torch moving and hold the flame so that the inner cone is about ____ from the surface.
A) 0.25 in
B) 0.5 in
C) 0.75
D) 1 in

Accepted Answer

D

Question 3

Pennies manufactured before 1982 are solid ____.
A) nickel
B) copper
C) zinc
D) silver

Accepted Answer

Prior to 1982, pennies were made of solid copper. In 1982, the United States Mint transitioned to a core made of zinc with a copper plating. Therefore, pennies manufactured before 1982 are solid copper.

Question 4

The concentrated flame of an oxyacetylene torch is not ideal for detailed work.

Accepted Answer

The concentrated flame of an oxyacetylene torch allows for precise control and is ideal for detailed metalworking tasks, such as welding and cutting.

Question 5

Overheating can burn off the ____ coating found on many nuts and bolts. Such fumes can be hazardous, so you must avoid breathing these fumes during the brazing process.
A) tin
B) cadmium
C) copper
D) silver

Accepted Answer

The coating on nuts and bolts is typically cadmium, which can be burned off during brazing and create hazardous fumes. Therefore, it is important to avoid breathing in these fumes.

Question 6

Both soldering and brazing can produce joints that are ____ the filler metal.
A) half as strong as
B) equally as strong as
C) twice as strong as
D) several times stronger than

Accepted Answer

Soldering and brazing can produce joints that are several times stronger than the filler metal used in the process. This is because the joint strength is not solely dependent on the filler metal but also on how the filler metal bonds with the base metals and the joint design.

Question 7

You cannot control the heat for soldering by decreasing the torch angle.

Accepted Answer

The angle at which the torch is held can affect the heat distribution, so decreasing the angle can help to reduce the heat in certain areas. However, other factors such as the type of torch, fuel, and distance from the solder joint also play a role in controlling the heat for soldering.

Question 8

The lower temperature used in ____ does not tend to create hard spots where the base metal becomes hardened.
A) welding
B) brazing
C) hard surfacing
D) soldering

Accepted Answer

The answer of The lower temperature used in ____ does...

Question 9

Brazing takes place at temperatures above ____ degrees F.
A) 640
B) 740
C) 840
D) 940

Accepted Answer

Brazing typically occurs at temperatures between 1100-2000 degrees Fahrenheit. The listed choices narrow down to the 800-degree range, and the correct answer is 840 degrees Fahrenheit.

Question 10

The process of using heat to soften metal so it can be bent or formed has been used ____.
A) as long as mankind has worked with metals
B) since the 13th century
C) since the 16th century
D) since the Industrial Revolution

Accepted Answer

The use of heat to soften metal for shaping predates recorded history and has been used since ancient times.

Question 11

With a(n) ____ joint, the area of the joint is greater than the thickness of the parts being joined.
A) lap
B) tee
C) butt
D) outside corner

Accepted Answer

In a lap joint, one part is overlapped onto the other part, resulting in a joint where the area of the joint is greater than the thickness of the parts being joined. This creates a stronger joint as there is more surface area for the two parts to adhere to each other.

Question 12

You can control the heat for both brazing and soldering by raising and lowering the torch flame.

Accepted Answer

By adjusting the torch flame, you can control the heat and temperature needed for brazing and soldering.

Question 13

In severe cases of overheating, zinc in a brazing alloy may start to burn with a(n) ____ flame.
A) orangish
B) whitish
C) orangish-whitish
D) reddish

Accepted Answer

The answer of In severe cases of overheating, zinc in...

Question 14

____ does not need capillary action to pull filler metal into the joint.
A) Brazing
B) Soldering
C) Braze welding
D) Hard surfacing

Accepted Answer

Braze welding does not rely on capillary action; instead, it uses a filler metal to build up a joint, similar to welding.

Question 15

Always securely clamp metal being drilled because if the drill bit grabs the metal, it will spin around the bit.

Accepted Answer

This is a safety precaution to prevent injury and damage to the material being drilled. If the metal is not securely clamped, it can spin around the drill bit, causing the bit to break, the material to be damaged, or even causing injury to the person operating the drill.

Question 16

Bending with heat produces as accurate a bend as if it were bent in a jig.

Accepted Answer

Bending with heat, while effective for shaping materials, often results in less precision and uniformity compared to bending in a jig, which is designed to ensure consistent and accurate bends.

Question 17

Pretinning parts is an excellent way of assembling small parts when you are working by yourself.

Accepted Answer

Pretinning parts involves coating small parts with solder before assembly, which can help hold them together and make it easier to work with them solo.

Question 18

When brazing beads, some of the signs that the braze metal is being overheated include the bead spreading out over the metal surface, the flux turning black, and/or a white powdery zinc oxide forming alongside of the braze bead.

Accepted Answer

When brazing beads, overheating can cause the bead to spread out too far, turn the flux black, and result in the formation of white powdery zinc oxide.

Question 19

It is not recommended to drill a small pilot hole before trying to drill a larger diameter hole in metal.

Accepted Answer

It is recommended to drill a small pilot hole before trying to drill a larger diameter hole in metal. This helps to ensure accuracy and prevent the larger drill bit from slipping or wandering on the surface of the metal.

Question 20

The application of a surface layer of braze material can be used to add a decorative and durable surface to mild steel.

Accepted Answer

Adding a surface layer of braze material can indeed be used to add both decorative and durable properties to mild steel. The braze material can create an attractive finish while also providing additional hardness and corrosion resistance.

Quiz 20: Soldering and Brazing

Soldering and brazing are a weak way of joining or repairing parts.

To prevent overheating with an oxyacetylene flame, keep the torch moving and hold the flame so that the inner cone is about ____ from the surface.

Pennies manufactured before 1982 are solid ____.

The concentrated flame of an oxyacetylene torch is not ideal for detailed work.

Overheating can burn off the ____ coating found on many nuts and bolts. Such fumes can be hazardous, so you must avoid breathing these fumes during the brazing process.

Both soldering and brazing can produce joints that are ____ the filler metal.

You cannot control the heat for soldering by decreasing the torch angle.

The lower temperature used in ____ does not tend to create hard spots where the base metal becomes hardened.

Brazing takes place at temperatures above ____ degrees F.

The process of using heat to soften metal so it can be bent or formed has been used ____.

With a(n) ____ joint, the area of the joint is greater than the thickness of the parts being joined.