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6 Month 5 > TPC 419 Arc Welding Operations > Flashcards

TPC 419 Arc Welding Operations Flashcards

1
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

1/8; 1000
1/4; 10,000
1/2; 500
1; 1000 

A

1/4; 10,000

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2
Q

SMAW electrodes are classified by their

Color
Core material
Feed rate
Length

A

Core material

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3
Q

Which of the following items offers protection from arc flash?

Cotton clothing
Respirator
Safety glasses
Welding helmet

A

Welding helmet

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4
Q

Important factors to consider when selecting SMAW electrodes include the

Composition of the base metal
Environmental conditions
Length to be welded
Type of joint

A

Composition of the base metal

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5
Q

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

B; Amount of current required
E; Tensile strength of the deposited metal
R; Special characteristics of the electrode
W; Welding position for which the electrode is suited

A

E; tensile strength of the deposited metal

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6
Q

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

Diameter of the electrode
Length of the electrode
Thickness of the covering
Welding position

A

Diameter of the electrode

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7
Q

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

Iron powder
Low hydrogen
Mineral covered
Titania covered

A

Iron powder

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8
Q

Electrodes covered with ______must not be allowed to become too dry.

Cellulose
Iron powder
Manganese oxide
Titanium oxide

A

Cellulose

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9
Q

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

Globular transfer
Pulsed gas
Short circuit
Spray transfer

A

Short circuit

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10
Q

Which of the following is a common GMAW shielding gas?

Argon
Hydrogen
Nitrogen
Oxygen

A

Argon

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11
Q

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

Conducts heat poorly
Conduct heat well
Heavier than air
Lighter than air

A

Heavier than air

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12
Q

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

Base metal composition
Joint condition
Shielding gas used
Welding position involved

A

Base metal composition

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13
Q

When preparing to operate a GMAW gun, position is nozzle about _______ in. above the worK and tilt it about _______• off vertical in the direction of the welding

1/4; 20
1/2; 45
3/4; 20
One; 45

A

3/4; 20

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14
Q

GTAW equipment and supplies may include which of the following?

AC welding machine
Air-cooled torch
Consumable electrodes
Flux Rods

A

Air-cooled torch

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15
Q

The purpose of the GTAW electrode is to

Conduct electricity
Emit shielding gas
Provide filler metal
Provide flux

A

Conduct

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16
Q

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

Argon; copper alloy
Carbon dioxide; carbon steel
Helium; low carbon steel
Nitrogen; stainless steel

A

Helium; low carbon steel

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17
Q

When welding stainless steel‘s with GTAW, you should use current, and when welding aluminum, you should use current

ACHF; DCEN
ACHF; DCEP
DCEN; ACHF
DCEP; DCEN

A

DCEN;ACHF

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18
Q

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

Can weld a large variety of metals
Is easily portable
Requires little school to perform
Requires no filler metal

A

Can weld a large variety of metals

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19
Q

Resistance welding uses electric current and ______ to join metals

Continuous electrodes
Electron beams
Ionized gas
Pressure

A

Pressure

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20
Q

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

Filler metal
Flux
Ionized gas
Plasma

A

Flux

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21
Q

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

Filler metal
Flux
Ionized gas
Water

A

Ionized gas

22
Q

Which of the following is part of conventional friction welding?

Electric heating
Flywheel
Spinning part
Vibrating head

A

Spinning part

23
Q

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

Can make a weld 200 times deeper than it is wide
Can make leak-tight joints in thin materials
Can weld very thick metals
Requires no special equipment

A

Can make leak-tight joints in thin materials

24
Q

Preheating parts before welding them reduces the

Distortion of the welded structure
Energy required for welding
Filler metal needed
Time required for welding

A

Distortion of the welded structure

25
Q

Uneven or rapid heating during welding causes ______ in metal, which can in tern cause_____

Contraction; deformation
Contraction; melting
Expansion; deformation
Expansion; Melting

A

Expansion; deformation

26
Q

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

Chemical composition
Color
Mechanical properties
Weight

A

Mechanical properties

27
Q

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

Ambient temperature
Carbon content
Electrode size
Part thickness

A

Carbon content

28
Q

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

Nonferrous metal
Rapid cooling after preheating
Welded on both sides
Welded on one side only

A

Rapid cooling after preheating

29
Q

Ferrous metals are those metals that are ______ based

Carbon
Copper
Iron
Lead

A

Iron

30
Q

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

Aligning the edges
Cutting or gouging the edge
Marking the weld’s location
Removing Knicks and burrs

A

Cutting or gouging the edge

31
Q

The most common method used for welding cast iron is

FCAW
GMAW
GTAW
SMAW

A

SMAW

32
Q

Cast iron can be welded at low currents in any position with ______ SMAW electrodes

Aluminum-bronze
Cast-iron
Nickel-based
Phosphorus-bronze

A

Nickel-based

33
Q

When welding alloy steel’s, you should use electrodes and current

Low-hydrogen; DCEP
Mildsteel; DCEN
Phosphorus-bronze; DCEN
Thoriated tungsten; DCEP

A

Low-hydrogen; DCEP

34
Q

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

Attracts a magnet
Flares and burns when heated
Readily forms an oxide coating
Turns red when heated

A

Readily forms an oxide coating

35
Q

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

Contact the part manufacture
inspect the part visually
Perform a chip test
Use in nitric acid test

A

Contact the part manufacturer

36
Q

The most widely used are processes for cutting nonferrous metal is

Air carbon
Carbon
Plasma
Shielded metal

A

Air carbon

37
Q

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

Base metal melts
Electrode is consumed
Flux corrodes
Oxidation reforms

A

Oxidation reforms

38
Q

When welding nickel, use the process and a power supply

GTAW; DCEN
GTAW; DCEP
SMAW;DCEN
SMAW;DCEP

A

GTAW;DCEN

39
Q

Compared to the other kinds of pipe joints, welded pipe joints are

Easier to construct
Heavier
More expensive
Stronger

A

Stronger

40
Q

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

AR – 1
AR – 2
AR – 3
AR – 4

A

AR – 1

41
Q

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

GMAW
GTAW
SAW
SMAW

A

SMAW

42
Q

Weld backup rings are special accessories that help prevent______ in pipe welding

Icicles
Poor fitup
Underbead cracking
Warping

A

Icicles

43
Q

The need for preheating and postheating when welding pipe depends on

Base metal composition and pipe thickness
Pipe diameter and weld process
Pipe thickness and pipe diameter
Weld process and weld orientation

A

Base metal composition and pipe thickness

44
Q

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

Abrasion
Corrosion
Erosion
Friction

A

Abrasion

45
Q

Cross-checking is desirable in some surfacing deposits because it

Improves overall appearance
Prevents slag inclusion
Provides additional strength
Relieves residual stress

A

Relieves residual stress

46
Q

The hardest, and most where resistant hard facing metals are

High-alloy Ferrous
Low-alloy Ferrous
Nonferrous
Tungsten carbide

A

Tungsten carbide

47
Q

The technique of _____ is especially useful for building up thin-edged tools.

Automatic hard facing
Manual arc hard facing
oxyacetylene hard facing
Thermal spraying

A

Oxyacetylene hard facing

48
Q

Most automatic hard facing is done with______ machines

FCAW
GMAW
SAW
SMAW

A

SAW

49
Q

In shielded metal arc welding, the shield is made of

Alloy metal
Flux
Gas
Oxides

A

Gas

50
Q

In SMAW, it is important to understand that lengthening the arc _____the resistance, which _______ the temperature.

Decreases; decreases
Decreases; increases
Increases; decreases
Increases; increases

A

Increases; increases

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