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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
Uneven or rapid heating during welding causes ______ in metal, which can in tern cause_____ Contraction; deformation Contraction; melting Expansion; deformation Expansion; Melting
Expansion; deformation
26
The heat-affected zone of a metal can undergo permanent changes in its Chemical composition Color Mechanical properties Weight
Mechanical properties
27
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
Carbon content
28
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
Rapid cooling after preheating
29
Ferrous metals are those metals that are ______ based Carbon Copper Iron Lead
Iron
30
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
Cutting or gouging the edge
31
The most common method used for welding cast iron is FCAW GMAW GTAW SMAW
SMAW
32
Cast iron can be welded at low currents in any position with ______ SMAW electrodes Aluminum-bronze Cast-iron Nickel-based Phosphorus-bronze
Nickel-based
33
When welding alloy steel’s, you should use electrodes and current Low-hydrogen; DCEP Mildsteel; DCEN Phosphorus-bronze; DCEN Thoriated tungsten; DCEP
Low-hydrogen; DCEP
34
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
Readily forms an oxide coating
35
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
Contact the part manufacturer
36
The most widely used are processes for cutting nonferrous metal is Air carbon Carbon Plasma Shielded metal
Air carbon
37
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
Oxidation reforms
38
When welding nickel, use the process and a power supply GTAW; DCEN GTAW; DCEP SMAW;DCEN SMAW;DCEP
GTAW;DCEN
39
Compared to the other kinds of pipe joints, welded pipe joints are Easier to construct Heavier More expensive Stronger
Stronger
40
Welding pipe in high-pressure systems requires that a welder have which AWS qualification level? AR – 1 AR – 2 AR – 3 AR – 4
AR – 1
41
Which of the following is the most widely used pipe welding process? GMAW GTAW SAW SMAW
SMAW
42
Weld backup rings are special accessories that help prevent______ in pipe welding Icicles Poor fitup Underbead cracking Warping
Icicles
43
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
Base metal composition and pipe thickness
44
Wear caused by grinding or scratching action of hard particles is called Abrasion Corrosion Erosion Friction
Abrasion
45
Cross-checking is desirable in some surfacing deposits because it Improves overall appearance Prevents slag inclusion Provides additional strength Relieves residual stress
Relieves residual stress
46
The hardest, and most where resistant hard facing metals are High-alloy Ferrous Low-alloy Ferrous Nonferrous Tungsten carbide
Tungsten carbide
47
The technique of _____ is especially useful for building up thin-edged tools. Automatic hard facing Manual arc hard facing oxyacetylene hard facing Thermal spraying
Oxyacetylene hard facing
48
Most automatic hard facing is done with______ machines FCAW GMAW SAW SMAW
SAW
49
In shielded metal arc welding, the shield is made of Alloy metal Flux Gas Oxides
Gas
50
In SMAW, it is important to understand that lengthening the arc _____the resistance, which _______ the temperature. Decreases; decreases Decreases; increases Increases; decreases Increases; increases
Increases; increases

6 Month 5 (8 decks)

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