Brainscape's Knowledge GenomeTM

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


See full index

5 6 Months > 419 > Flashcards

419 Flashcards

1
Q

Which of the following is part of conventional friction welding?

A

Spinning part

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

Using a chemical cleaner to clean aluminum before welding slows the rate at which the

A

Oxidation reforms

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

The hardest and most wear resistant hard-facing metals are

A

Tungsten carbide

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

The purpose of the GTAW electrode is to

A

Conduct electricity

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

Electrodes covered with ______ must not be allowed to become too dry.

A

Cellulose

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Welding pipe in high-pressure systems requires that a welder have which AWS qualification level?

A

AR-1

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

Plasma arc welding is unique in that the electricity passes through a layer of

A

Ionized gas

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

Which of the following is a step in edge preparation for ferrous metals?

A

Cutting or gouging the edge

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

Important factors to consider when selecting SMAW electrodes include the

A

Composition of the base metal

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

When preparing to operate a GMAW gun, position its nozzle about ______ in. above the work and tilt it about ______

A

3/4; 20

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

Submerged arc welding is unique in that the electricity passes through a layer of

A

Flux

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

Generally, the main consideration when selecting an electrode wire for a GMAW application is the

A

base metal composition

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

Weld backup rings are special accessories that help prevent ______ in pipe welding

A

icicles

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

Which of the following is the most widely used pipe welding process?

A

SMAW

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

Which of the following items offers protection from arc flash?

A

Welding helmet

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

Which of the following conditions indicates a possible need for postheating?

A

Rapid cooling after preheating

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Uneven or rapid heating during welding causes _______ in a metal, which can in turn cause _______

A

expansion; deformation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

What should be your primary consideration when deciding whether or not preheating of a ferrous metal part is necessary?

A

Carbon content

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

One advantage of ultrasonic welding over other types of welding is that it

A

can make leak-tight joints in thin matenals

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

What is the best way to determine the kind of metal a part is made of?

A

Contact the part manufacturer

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

When welding nickel, use the _____ process and a ______ power supply.

A

GTAW, DCEN

22
Q

Which of the following is a common GMAW shielding gas?

A

Argon

23
Q

When welding alloy steels, you should use ______ electrodes and _______ current

A

low-hydrogen; DCEP

24
Q

SMAW is started by touching the end of an electrode to the base metal, then lifting the electrode about _____ in. to make an arc. The arc produces temperatures in the range of ____ °F

A

1/4; 10,000

25
Q

castiron can be welded at low currents in any positon with _______ SMAW electrodes

A

Nickel-based

26
Q

When selecting an electrode for SMAW, you should consider the current range, which depends mainly on the

A

diameter of the electrode

27
Q

compared to other kinds of pipe joints, welded pipe joints are

A

Stronger

28
Q

Cross-checking is desirable in some surfacing deposits because it

A

relieves residual stress

29
Q

The need for preheating and postheating when welding pipe depends on

A

base metal composition and pipe thickness

30
Q

The technique of ______ Is especially useful for building up thin-edged tools.

A

Oxyacetylene hard facing

31
Q

Which of the following is an advantage of GTAW over other welding processes?

A

Can weld a large variety of metals

32
Q

An important property of aluminum that you should be aware of is that it

A

readily forms an oxide coating

33
Q

The best shielding gas for a flat or horzontal GMAW weld is one that (IS)

A

Heavier than air

34
Q

Ferrous metals are those metals that are _____ based

A

Iron

35
Q

The most widely used are process for cutting nonferrous metals is

A

Air carbon

36
Q

In shielded metal are welding, the shield is made of

A

Gas

37
Q

Wear caused by grinding or scratching action of hard particles is called

A

Abrasion

38
Q

In SMAW, it is important to understand that lengthening the arc _____ the resistance, which _____ the temperature

A

Increases; increases

39
Q

Preheating parts before welding them reduces the

A

distorton of the welded structure

40
Q

Resistance welding uses electric current and ______ to join metals

A

Pressure

41
Q

Most automatic hard facing is done with _______ machines

A

SAW

42
Q

Welding electrodes are identified by the letter _____ followed by a number. The first two digits of the number identify the ______.

A

E; tensile strength of the deposted metal

43
Q

The most common method used for welding cast iron Is

A

SMAW

44
Q

When using GTAW to weld a very thick piece of low-carbon steel, you should use _____ as a shielding gas and _____ as the filler metal

A

Helium; low carbon steel

45
Q

The heat-affected zone of a metal can undergo permanent changes in its

A

Mechanical properties

46
Q

SMAW electrodes are classified by their

A

Core meterial

47
Q

GTAW equipment and supplies may include which of the following?

A

Air cooled torch

48
Q

In wnich of the following is electrode metal deposited when direct contact occurs between the electrode and the base metal?

A

Short circuit

49
Q

When welding stainless steels with GTAW, you should use ____ current, and when welding aluminum, you should use _____ current

A

DCEN; ACHF

50
Q

What kind of covered electrode allows you to use high welding current without causing excessive penetration?

A

Iron powder

5 6 Months (8 decks)

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