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Question 1

Which of the following is part of conventional friction welding?

Answer 1

Spinning part

Question 2

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

Answer 2

Oxidation reforms

Question 3

The hardest and most wear resistant hard-facing metals are

Answer 3

Tungsten carbide

Question 4

The purpose of the GTAW electrode is to

Answer 4

Conduct electricity

Question 5

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

Answer 5

Cellulose

Question 6

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

Answer 6

AR-1

Question 7

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

Answer 7

Ionized gas

Question 8

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

Answer 8

Cutting or gouging the edge

Question 9

Important factors to consider when selecting SMAW electrodes include the

Answer 9

Composition of the base metal

Question 10

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

Answer 10

3/4; 20

Question 11

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

Answer 11

Flux

Question 12

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

Answer 12

base metal composition

Question 13

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

Answer 13

icicles

Question 14

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

Answer 14

SMAW

Question 15

Which of the following items offers protection from arc flash?

Answer 15

Welding helmet

Question 16

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

Answer 16

Rapid cooling after preheating

Question 17

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

Answer 17

expansion; deformation

Question 18

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

Answer 18

Carbon content

Question 19

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

Answer 19

can make leak-tight joints in thin matenals

Question 20

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

Answer 20

Contact the part manufacturer

Question 21

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

Answer 21

GTAW, DCEN

Question 22

Which of the following is a common GMAW shielding gas?

Answer 22

Argon

Question 23

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

Answer 23

low-hydrogen; DCEP

Question 24

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

Answer 24

1/4; 10,000

Question 25

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

Answer 25

Nickel-based

Question 26

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

Answer 26

diameter of the electrode

Question 27

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

Answer 27

Stronger

Question 28

Cross-checking is desirable in some surfacing deposits because it

Answer 28

relieves residual stress

Question 29

The need for preheating and postheating when welding pipe depends on

Answer 29

base metal composition and pipe thickness

Question 30

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

Answer 30

Oxyacetylene hard facing

Question 31

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

Answer 31

Can weld a large variety of metals

Question 32

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

Answer 32

readily forms an oxide coating

Question 33

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

Answer 33

Heavier than air

Question 34

Ferrous metals are those metals that are _____ based

Answer 34

Iron

Question 35

The most widely used are process for cutting nonferrous metals is

Answer 35

Air carbon

Question 36

In shielded metal are welding, the shield is made of

Answer 36

Gas

Question 37

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

Answer 37

Abrasion

Question 38

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

Answer 38

Increases; increases

Question 39

Preheating parts before welding them reduces the

Answer 39

distorton of the welded structure

Question 40

Resistance welding uses electric current and ______ to join metals

Answer 40

Pressure

Question 41

Most automatic hard facing is done with _______ machines

Answer 41

SAW

Question 42

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

Answer 42

E; tensile strength of the deposted metal

Question 43

The most common method used for welding cast iron Is

Answer 43

SMAW

Question 44

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

Answer 44

Helium; low carbon steel

Question 45

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

Answer 45

Mechanical properties

Question 46

SMAW electrodes are classified by their

Answer 46

Core meterial

Question 47

GTAW equipment and supplies may include which of the following?

Answer 47

Air cooled torch

Question 48

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

Answer 48

Short circuit

Question 49

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

Answer 49

DCEN; ACHF

Question 50

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

Answer 50

Iron powder