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5th Sixth > 419 > Flashcards

419 Flashcards

1
Q

Smaw is started by touching the end of an electrode to the base metal and then lifting the electrode about ___ in to make an arc. The arc produces temperatures in the range of __ degrees

A

1/4, 10,000

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2
Q

In shielding metal arc welding the shield is made of

A

gas

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3
Q

In smaw it is important to understand the lengthening the arc __ the resistance, which ___ the temperature.

A

Increases, Increases

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4
Q

smaw electrodes are classified by their

A

core material

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5
Q

which of the following items offers protection from arc flash

A

welding helmet

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6
Q

important factors to consider when selecting smaw electrodes include the

A

composition of the base metals

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7
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 deposited metal

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8
Q

when selecting an electrode for smaw you should consider the current range which depends mainly on the

A

diameter of the electrode

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9
Q

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

A

iron powder

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10
Q

electrodes covered with ___ must not be allowed to become to dry

A

cellulose

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11
Q

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

A

short circuit

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12
Q

which of the following is a common gmaw shielding gas

A

argon

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13
Q

the best shielding gas for a flat or horizontal gmaw weld is one that is

A

heavier than air

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14
Q

generally, the main consideration when selecting an electrode wire for a gmaw application is the

A

base metal composition

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15
Q

when preparing to operate a gmaw gun position its nozzle about ___ in above the work and tilt it about ___ degrees off vertical in the direction of the welding

A

3/4, 20

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16
Q

gtaw equipment and supplies may include which of the following

A

air cooled torch

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17
Q

the purpose of the gtaw electrode is to

A

conduct electricity

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18
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

A

helium, low carbon steel

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19
Q

when welding stainless steels with gtaw you should use ___ current and when welding aluminum you should use ___ current

A

DCEN , ACHF

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20
Q

which of the following is an advantage of gtaw over other welding processes

A

can weld a large variety of metal

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21
Q

resistance welding uses electric current and __ to join metals

A

pressure

22
Q

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

A

flux

23
Q

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

A

ionized gas

24
Q

which of the following is part of conventional fiction welding

A

spinning part

25
Q

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

A

can make leak-tight joints in thin materials

26
Q

preheating parts before welding them reduces the

A

distortion of the welded structure

27
Q

uneven or rapid heating during welding causes __ in a material which can in turn cause ___

A

expansion, deformation

28
Q

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

A

mechanical properties

29
Q

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

A

carbon content

30
Q

which of the following conditions indicates a possible need for postheating

A

rapid cooling after preheating

31
Q

ferrous metals are those metals that are __ based

A

iron

32
Q

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

A

cutting or gouging the edge

33
Q

the most common method used for welding cast iron is

A

smaw

34
Q

cast iron can be welded at low currents in any position with ___ smaw electrodes

A

nickel based

35
Q

when welding alloy steels you should use __- electrodes and ___ current

A

low hydrogen, DCEP

36
Q

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

A

readily forms an oxide coating

37
Q

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

A

contact the part manufacturer

38
Q

the most widely used are process for cutting nonferrous metals is

A

air carbon

39
Q

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

A

oxidation reforms

40
Q

When welding nickel use the ___ process and a ___ power supply

A

GTAW, DCEN

41
Q

compared to other kinds of pipe joints welded pipe joints are

A

stronger

42
Q

welding pipe in high pressure systems requires that a welder have which AWS qualification level

A

AR-1

43
Q

which of the following is the most widely used pipe welding process

A

smaw

44
Q

weld backup rings are special accessories that help prevent __ in pipe welding

A

icicles

45
Q

the need for preheating and postheating when welding pipe depends on

A

base metal composition and pipe thickness

46
Q

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

A

abrasion

47
Q

cross-checking is desirable in some surfacing deposits because it

A

relieves residual stress

48
Q

the hardest and most wear resistant hard facing metals are

A

tungsten carbide

49
Q

the technique of ___ is especially useful for building up thin edged tools

A

Oxyacetylene hard facing

50
Q

most automatic hard facing is done with __ machines

A

saw

5th Sixth (8 decks)

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