Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Welding Level 2 > Chapter 4 > Flashcards

Chapter 4 Flashcards

You may prefer our related Brainscape-certified flashcards:
Welding Inspection Basics flashcards Certified Sommelier Exam (CMS 2) flashcards
1
Q

_______________ is an example of welding with heat and pressure

A

resistance spot welding (RSW)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What is resistance spot welding (RSW)?

A

A resistance welding process used to join overlapping pieces of metal together by creating small spot welds between two electrodes.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What is resistance welding (RW)?

A

It is a process that uses the resistance of metals to electrical flow as a source of heat for welding.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

No ______ is used in resistance welding. In these processes, high current is passed through the base metal. The base metal’s resistance to the current flow generates the ____________ needed to create the weld.

A
  • filler metal
  • heat
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

A ________ metal is made of one substance. For example ___________

A
  • pure
  • iron, aluminum and nickle
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

A ___________ is a metal with additional elements. The properties of the pure metals are improved by adding other elements.

A

metal alloy

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What are some examples of metal alloys?

A

low carbon steel
stainless steel

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

_______________ properties determines how a material reacts with other materials

A

chemical

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What is corrosion resistance?

A

A material’s ability to withstand attack by corrosives such as acid and salt water.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What is oxidation resistance?

A

A ability of a material to resist the formation of oxides. Metal oxides occur when oxygen is combined with metal.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

_______________ is ability of a material to withstand applied loads without failing.

A

strength

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

_________________ is the ability of a material to resist pulling forces.

A

tensile strength

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

_______________ is the ability of a material to resist pulling or crushing forces

A

compressive strength

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

________ is the ability of a material to stretch or bend without breaking

A

ductility

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

______________ is the inability of a material to resist fracturing.

A

Brittleness

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

________ is the ability of a material to resist cracking and prevent a crack from expanding

A

toughness

17
Q

____________ is the ability of a material to resist indentations or scratching

A

hardness

18
Q

Welding a metal affects its _________ and _______ properties. Heat produced by welding creates stress in the metal.

A

chemical and mechanical

19
Q

What is stress?

A

An internal force within a metal, also the load imposed on an object.

20
Q

Heat affects the _______ and the _______ of the metal. If the metal was heat-treated before being welded the effects of heat treating are ___________ in the area around the weld.

A

ductility and toughness
lost

21
Q

True or False: When heat is applied to a metal, does the metal expand or increase in size?

A

True

22
Q

When heat is removed, metal cools and __________________

A

contracts or decreases in size

23
Q

True or False: Expansion and contraction does not affect the stress of the metal

A

False: Expansion and contraction creates stress in the metal

24
Q

Why does metal warp? Is it acceptable?

A

It does this to relief stress. In many welding applications deformation and movement is not acceptable. Welding jigs or fixtures are commonly used to keep parts from moving.

25
Q

What can you do to reduce or prevent movement and/or stress in the parts during welding?

A
  1. Tack weld the parts
  2. Align the parts to allow for contraction during welding
  3. Use welding jogs or fixtures to clamp the pieces
  4. Preheat the parts
  5. Heat treat the welded parts
  6. Use the proper welding procedure
26
Q

What is the purpose of preheating, interpass heating and some post-weld heat treating processes?

A

To reduce stress. High stress int he material may prevent the part from forming as intended.

27
Q

What is preheating?

A

A process that heats the metal to a specific temperature prior to a surfacing of welding operation.
It also slows the cooling rate with produces less stress.

28
Q

What is interpass heating?

A

The heating of metal while it is being welded or between weld passes.

29
Q

______________ and __________ are heat treating processes in which a metal is heated and allowed to cool slowly.

A

Annealing and normalizing

30
Q

Annealing and normalizing steel involves heating the steel to ___________ degrees in an oven or furnace for a specific amount of time. In the normalizing process the steel is removed from the furnace and allowed to air-cool.

A

1400 °F -1670°F (760 °C to 910°C)

31
Q

What is stress-relieving?

A

It is a process used to to reduce stress and is similar to annealing except that lower temperatures are used.

32
Q

What is quenching?

A

Rapid cooling of metal in a heat-treating process as a means of hardening it

33
Q

What is tempering?

A

A heating process in which metal is heated to reduce hardness and improve toughness.

34
Q

When quenching and tempering, the steel is tempered by reheating it to ______ degrees and cooling it.

A

400°F- 1300°F (200°C to 700°C)

35
Q

______________ is the force that causes electrons to flow through a circuit.

A

Voltage

36
Q

What is Open circuit voltage (OCV)?

A

Voltage present in an electrical circuit even when no current is flowing.

37
Q

The _________ between the electrode and base metal offers resistance to the flow of electrons.

A

air gap

38
Q

____________ is the flow of electrons in an electrical circuit.

A

current

39
Q

Current is measured in _______ or ______. Current can be compared to the flow of water from a faucet.

A

amperes or amps

Welding Level 2 (21 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions