Brainscape's Knowledge GenomeTM

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


See full index

Welding > dc2 welding > Flashcards

dc2 welding Flashcards

You may prefer our related Brainscape-certified flashcards:
Welding Inspection Basics flashcards
0
Q

List three frequent causes of porosity in welds

A

Leaks in gas lines
TOO HIGH GAS FLOW
DRAFTS AND EXCESSIVE TURBULENC IN WELD POOL

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

What are the four main causes of lack of fusion/penetration in a weld

A

Welder parameters
Welder technique
magnetic arc blow
Joint prep

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

An irregular groove at the toe of a run in the base metal is what type of welding imperfection

A

undercut

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

An overlap is a welding imperfection that is form when excessive ____ is added to the joint

A

weld metal

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

What type of inspection is used to check a welds quality without destroying the weld?

A

NDT

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

What is the most common and coast effective weld inspection?

A

Visual

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

What is the best way to check fillet weld size?

A

Fillet weld size

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

Gas Free Engineering Personnel are defined as what three positions?

A

Gas free engineer
Gas free engineer assistant
gas free engineering petty officers

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

The GFE afloat shall be of what pay grade?

A

E7 or above

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

GFE shall complete how many hours of practical on the job training

A

40 hours

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

The GFEA shall be of what paygrade and completed what formal course?

A

E6 or above

complete GFE course

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

GFEPO shall be what paygrade and completed what training?

A

E4 or above and have completed NAVEDTRA 43704 gfepo

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

Conditions for classifying a confined space as an IDLH?

A

Flam limit is of ten or more percent of the LEL- Oxygen content less than 19.5% and greater than 22%

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

Hot work includes any operation producing temperatures of what or higher?

A

400F or 204.4C

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

Keep welding or cutting operations which produce high levels of ultra violet radiation at least how many feet away from chlorinated solvents?

A

200 feet

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

The four gas analyzer is water, shock and ____ resistant?

A

EMI

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

Remote sampling tubes for the four gas analyzer are 19 and ___ feet long?

A

33

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

Four gas analyzer is charger is powered by a ___ VAC adaptor?

A

110

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

is the difference between ferrous and non ferrous metals?

A

Ferrous contain iron

non ferrous do not contain appreciable amount of iron

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

Stainless steel is classified by the american iron and steel institue into what categories?

A

Stainless steel 200-300 series
&
Stainless steel 400 series

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

Stainless steel 200-300 series are known as what?

A

Austentic- tough and ductile. ideal for welding and requires no annealing.

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

Stainless steel 400 series are subdivied into what two groups?

A

Ferritic chromium

Martensitic chromium

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

Used in the manufacture of aircraft parts such as propellers?

A

Nickel steel

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

Used for the races and balls in anti friction bearings; highly resistant to corrosion and to scale

A

Chromium steels

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

Expensive to produce, its use is largely restricted to drills, lathe tools, milling cutters

A

Tungesten steel

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

Are non ferrous metals magnetic?

A

NO

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

Zinc is used on iron or steel in a form of protective coating called what?

A

Galvanizing

27
Q

What is the texture of unfinished stainless steel?

A

slightly rough

28
Q

A grinder used for a metal spark test should spin no less than _____ feet per minute?

A

4500

29
Q

Test used to determine the various effects of discontinuities in welding are called?

A

Destructive testing

30
Q

Which type of iron is one of the main raw materials used to make steel?

A

Pig iron

31
Q

Which stainless steel is normally non magnetic?

A

Austentic chromium nickel of the 300 series

32
Q

Joins metals by heating and hammering until the metals are fused together?

A

Forged welding

33
Q

Process that fuses metal by heating it to a melting temperature with an electric arc created between an electrode and the metals being joined?

A

Arc welding

34
Q

No shielding is used in what type of arc welding?

A

Carbon arc welding (CAW)

35
Q

The most common types of welding include ARC welding (AW), _______ and _______?

A 
Resistance welding (RW)
Oxyfuel gas welding (OFW)
36
Q

When burned with oxygen, acetylene produces a hot flame with temperatures ranging at what degree?

A

5700F-6300F

37
Q

Up to what pressure can acetylene be compressed to?

A

275 psi

38
Q

Acetone can be drawn from an acetylene cylinder when the cylinder is not in which postion?

A

Upright

39
Q

After laying an acetylene cylinder on its side it must sit upright for how long before use?

A

2 hours

40
Q

In what unit is acetylene measured in?

A

Cubic feet with the most common cylinder size being 130, 290 and 330 cubic feet. Most common standard size holds 225 cuft of acetylene.

41
Q

MAPP (methylacetylene-propadiene) is measured in what unit?

A

Pounds

42
Q

MAPP gas at 70lbs can do the same amount of work as six and half _____ cubic foot acetylene cylinders

A

225

43
Q

The total weight for a MAPP gas cylinder is ____ pounds. ___ pounds is MAPP gas.

A

120lbs

70lbs

44
Q

You can store MAPP gas in what postions?

A

Any position.

45
Q

Molten metal from the tip of the electrode flows together with the molten metal from the base metal to form a sound joint is called?

A

Fusion

46
Q

GTAW( gas tungsten arc welding) or TIG uses a number os sheilding gases including HE and AR. what are HE and AR?

A

Helium and Argon

47
Q

GMAW(Gas metal arc welding) or MIG uses a shielding gas, usually argon with 1 to 5% oxygen or argon with CO2 with what percentages?

A

3-25%

48
Q

FCAW(Flux core arc welding) is a gas shielding process that uses a continuously fed consumable tubular electrode containing a ___

A

flux

49
Q

Four factors for choosing a welding method are?

A

Types of metal
Nature of products you are fabricating
Techniques you use to fabricate them
Cost involved

50
Q

Electrodes are grouped into these two categories?

A

Consumable and non consumable

51
Q

Primary purpose of flux is what?

A

To prevent oxidation of the base and filler materials

52
Q

Flux is thought of as a ____ agent

A

cleaning

53
Q

Joint used to join two members aligned in the same plane?

A

Butt Joint

54
Q

Used to join two members located at right angles?

A

Corner and tee joints

55
Q

Most nonferrous metals can be annealed but never what?

A

Tempered

56
Q

How many major stages are there for heat treating metals?

A

three

57
Q

What are the four basic types of heat treatment in use today?

A

Annealing
Normalizing
Hardening
Tempering

58
Q

when performing a lap or corner joint, you should overlap the metals a minimum of how many times the thickness of the thinnest member you are joining?

A

3 times the thickness

59
Q

Used to join the edges of two or more members laying in the same plane? in most cases one of the members is flanged

A

Edge joint

60
Q

An edge joint should only be used for joining metals ___ thick or less that are not subject to heavy loads?

A

1/4”

61
Q

Portion of the joint where metals are closest to each other?

A

Root

62
Q

Opening or space provided between the edges of the metal parts to be welded?

A

Groove

63
Q

Angle formed between the prepared edge of a member and a plane perpendicular to the surface of the member?

A

Bevel angle

64
Q

The total angle of the groove between the parts to be joined?

A

Groove angle

65
Q

To determine the bevel, groove and root opening for a joint, you must consider what factors?

A

Thickness of the weld material
Type of joint to be made
Welding process to be used

Welding (1 decks)

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