dc2 welding

Question 0

List three frequent causes of porosity in welds

Answer 0

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

Question 1

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

Answer 1

Welder parameters
Welder technique
magnetic arc blow
Joint prep

Question 2

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

Answer 2

undercut

Question 3

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

Answer 3

weld metal

Question 4

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

Answer 4

NDT

Question 5

What is the most common and coast effective weld inspection?

Answer 5

Visual

Question 6

What is the best way to check fillet weld size?

Answer 6

Fillet weld size

Question 7

Gas Free Engineering Personnel are defined as what three positions?

Answer 7

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

Question 8

The GFE afloat shall be of what pay grade?

Answer 8

E7 or above

Question 9

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

Answer 9

40 hours

Question 10

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

Answer 10

E6 or above

complete GFE course

Question 11

GFEPO shall be what paygrade and completed what training?

Answer 11

E4 or above and have completed NAVEDTRA 43704 gfepo

Question 12

Conditions for classifying a confined space as an IDLH?

Answer 12

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

Question 13

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

Answer 13

400F or 204.4C

Question 14

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

Answer 14

200 feet

Question 15

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

Answer 15

EMI

Question 16

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

Answer 16

33

Question 17

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

Answer 17

110

Question 18

is the difference between ferrous and non ferrous metals?

Answer 18

Ferrous contain iron

non ferrous do not contain appreciable amount of iron

Question 19

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

Answer 19

Stainless steel 200-300 series
&
Stainless steel 400 series

Question 20

Stainless steel 200-300 series are known as what?

Answer 20

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

Question 21

Stainless steel 400 series are subdivied into what two groups?

Answer 21

Ferritic chromium

Martensitic chromium

Question 22

Used in the manufacture of aircraft parts such as propellers?

Answer 22

Nickel steel

Question 23

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

Answer 23

Chromium steels

Question 24

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

Answer 24

Tungesten steel

Question 25

Are non ferrous metals magnetic?

Answer 25

NO

Question 26

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

Answer 26

Galvanizing

Question 27

What is the texture of unfinished stainless steel?

Answer 27

slightly rough

Question 28

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

Answer 28

4500

Question 29

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

Answer 29

Destructive testing

Question 30

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

Answer 30

Pig iron

Question 31

Which stainless steel is normally non magnetic?

Answer 31

Austentic chromium nickel of the 300 series

Question 32

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

Answer 32

Forged welding

Question 33

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

Answer 33

Arc welding

Question 34

No shielding is used in what type of arc welding?

Answer 34

Carbon arc welding (CAW)

Question 35

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

Answer 35

``` Resistance welding (RW) Oxyfuel gas welding (OFW) ```

Question 36

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

Answer 36

5700F-6300F

Question 37

Up to what pressure can acetylene be compressed to?

Answer 37

275 psi

Question 38

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

Answer 38

Upright

Question 39

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

Answer 39

2 hours

Question 40

In what unit is acetylene measured in?

Answer 40

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

Question 41

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

Answer 41

Pounds

Question 42

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

Answer 42

225

Question 43

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

Answer 43

120lbs | 70lbs

Question 44

You can store MAPP gas in what postions?

Answer 44

Any position.

Question 45

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?

Answer 45

Fusion

Question 46

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

Answer 46

Helium and Argon

Question 47

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?

Answer 47

3-25%

Question 48

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

Answer 48

flux

Question 49

Four factors for choosing a welding method are?

Answer 49

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

Question 50

Electrodes are grouped into these two categories?

Answer 50

Consumable and non consumable

Question 51

Primary purpose of flux is what?

Answer 51

To prevent oxidation of the base and filler materials

Question 52

Flux is thought of as a ____ agent

Answer 52

cleaning

Question 53

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

Answer 53

Butt Joint

Question 54

Used to join two members located at right angles?

Answer 54

Corner and tee joints

Question 55

Most nonferrous metals can be annealed but never what?

Answer 55

Tempered

Question 56

How many major stages are there for heat treating metals?

Answer 56

three

Question 57

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

Answer 57

Annealing Normalizing Hardening Tempering

Question 58

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?

Answer 58

3 times the thickness

Question 59

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

Answer 59

Edge joint

Question 60

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

Answer 60

1/4"

Question 61

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

Answer 61

Root

Question 62

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

Answer 62

Groove

Question 63

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

Answer 63

Bevel angle

Question 64

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

Answer 64

Groove angle

Question 65

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

Answer 65

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