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202B Flashcards

GTAW electrodes, filler metals and shielding gas (57 cards)

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1
Q

A Characteristic of tungsten is that that it:

A. oxidizes readily
B. dissolves homogeneous into the weld.
C. retains its hardness at red heat.
D. has a melting point of 325C (617F)

A

C. retains its hardness at red heat.

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2
Q

tungsten is classified as a ____________ metal, which means that it has a high melting point of __________.

A

refractory metal

3410C (6170F)

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3
Q

What type of electrode is used for the GTAW process

A. consumable
B. non-consumable
C. flux coated
D. flux cored

A

B. non-consumable

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4
Q

the advantage that a ground-finished electrode has over a chemically cleaned electrode is that it:

A. has better electrical contact will collet
B. is easier to Strick an ark
C. produces more heat in the torch body
D. gives you better control with out of position work

A

A. has better electrical contact will collet

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5
Q

the reason thoria is added to GTAW electrode is to:

A. increase electrical resistance at the molten end
B. improve electrodes ability to create a clean, round, balled end
C Improve thermal conductivity which promotes cooling
D. increases current carrying capacity and arc stability.

A

D. increases current carrying capacity and arc stability.

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6
Q

an EWTh-1 electrode would be a good choice for welding:

A aluminum
B magnesium
C cast-iron
D mild steel

A

D mild steel

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7
Q

what would be a good choice for a green-coded electrode?

A DC reverse polarity on mild steel
B AC with only high frequency on stainless steel
C DC straight polarity on magnesium
D AC with continuous high frequency on aluminum

A

D AC with continuous high frequency on aluminum

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8
Q

state three (3) methods that may be used to prepare an electrode for welding

A _______________
B________________
C________________

A

A electrical arc
B grinding
C chemical sharpening

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9
Q

An EWTh-2 ground to a conical point is prepared correctly for welding on:

A stainless steel
B aluminum
C magnesium
D aluminum/magnesium casting

A

A stainless steel

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10
Q

what protects the electrode from atmospheric contamination?

A shielded gases
B fluxes
C electrode coatings
D water cooling of the torch

A

A shielded gases

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11
Q

oxidization of the electrode immediately after the arc is extinguished is prevented by:

A a post flow of shielded gas
B working within the recommended current ranges
C selecting the correct grade of tungsten electrode
D not touching the electrode to the work

A

A a post flow of shielded gas

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12
Q

what is the primary consideration when selecting a filler rod?

A

type of material so as the rod chemistry and mechanical property’s match the required job specification

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13
Q

which 2 filler metals can be used to weld the most weldable aluminum alloys?

A ER1100 and ER3003
B ER4043 and ER5345
C ER5083 and ER5454
D ER6061 and ER6351

A

B ER4043 and ER5345

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14
Q

the AWS/CSA filler metal classification for GTAW of carbon steels maybe also be used for:

A. SMAW
B. FCAW
C. SAW
D. GMAW

A

D. GMAW

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15
Q

To prevent porosity during GTAW of rimmed steels, filler rods must have:

A. multiple deoxidizers
B. a high manganese content
C. a low carbon content
D. a low silicon content

A

A. multiple deoxidizers

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16
Q

Which of the following aluminums filler rod has magnesium as it major alloying element?

A ER1100
B ER2319
C ER4043
D ER5356

A

D ER5356

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17
Q

CSA filler metal specifications differ from AWS speculation in that tensile strength is expressed in:

A kilograms
B joules
C newtons
D megapascals

A

D megapascals

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18
Q

GTAW filler rods should properly stored to prevent contamination from:

A. moisture
B. ozone
C. non-ionizing radiation
D. high frequency current

A

A. moisture

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19
Q

what are two advantages of using consumable inserts for joining pipe?

A_____________
B_____________

A

any two

A consistent quality of metal deposition
b suitable when access is only from one side
C exact metallurgical properties
d smooth crevice free internal weld surfaces
e can serve as backing ring

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20
Q

what is the maximum allowable gap when joining the ends of a consumable insert?

__________________________

A

0.8mm (1/32)

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21
Q

name two shielding gas used with GTAW that are described as

A inert __________ and __________
B reactive: ___________ and _________

A

inert = argon and helium
Reactive = nitrogen and hydrogen

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22
Q

Explain why argon-CO2 gas mixtures are not recommended for GTAW?

A

CO2 breaks down in the heat of arc into carbon monoxide and oxygen causing electrode oxidation and weld metal contamination

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23
Q

The gas shielding of the GTAW process:

A. promotes the flow of filler metal to the bead edges
B. allows arc ignition without having to touch the electrode to the work
C. protects the electrodes and the weld puddle from atmospheric contamination
D. helps to control AC arc rectifiers

Study These Flashcards
A

C. protects the electrodes and the weld puddle from atmospheric contamination

24
Q

which of the following gasses is the heaviest in air?

A. argon
B. helium
C. nitrogen
D. hydrogen

25
which of the following is a characteristic of argon shielding gas? A promotes deep penetrating qualities B used for fat welding speeds C narrow heat affected zone D smooth quiet arc action
D smooth quiet arc action
26
The shielding gas mixture argon hydrogen is an advantage when welding : A heavy mild steel materials B at high speeds on aluminum C root passes on cooper pipe D light wall stainless steel with automatic equipment
D light wall stainless steel with automatic equipment
26
which gas requires higher flow rates? why?
helium because it is lighter then atmosphere and tends to disperse from weld zone quickly
27
When using GTAW on aluminum, changing from argon to a mixture of argon-helium results in: A improved cleaning action B a much faster welding speed C a reduced risk of hot short cracking D a flatter weld bead
B a much faster welding speed
28
the gas best suited for manual GTAW on carbon steel is _______________.
argon
29
when using GTAW on aluminum, what inert gas produces the most efficient oxide removal ? A. argon B. helium C. neon D. xenon
A. argon
30
helium is used as a shielding gas on stainless steel when: A high heat input is of primary importance B undercutting at the edges is a problem C maximum penetration is desired D root bead contamination becomes excessive
C maximum penetration is desired
31
tungsten is a poor conductor of heat. A. True B. False
A. True
32
What type of electrodes are used for gas tungsten arc welding? A. consumable B. non-consumable C. flux coated D. solid cored wire
B. non-consumable
33
Which of the following factors must be considered in selecting GTAW electrodes? A. thickness of material B. shielding gas used C. joint design D. all of the above
D. all of the above
34
When comparing AC current carrying ranges and limits, which electrode has the poorest current carrying capacity? A. EWP B. EWTh1 C. EWTh2 D. EWZr
A. EWP
35
36
What is a characteristic of an EWCe-2 electrode? A. are radioactive B. are not radioactive C. are color coded red D. do not require a shielding gas
B. are not radioactive
37
What is the color code for an EWG GTAW electrode? A. green B. brown C. yellow D. grey
D. grey
38
Which of the following would be a good selection for a green coded electrode? A. D.C. reverse polarity on mild steel B. D.C. straight polarity on magnesium C. A.C. high frequency start on stainless steel D. A.C. continuous high frequency on aluminum
D. A.C. continuous high frequency on aluminum
39
In the AWS numbering code system, what does EW stand for? A. electric welding B. electric, wire C. electrode, wolfram D. none of the above
C. electrode, wolfram
40
What is the primary factor for selecting a filler rod type? A. amperage and voltage settings B. type of base metal C. tensile strength of the base metal D. types of joints to be welded
B. type of base metal
41
How may positive identification of GTAW filler rods be done by the manufacturer? A. color code B. attached tag C. separate containment D. all of the above
A. color code
41
What is ER4043 an alloy of? A. iron and chromium B. copper and nickel C. iron, molybdenum and nickel D. aluminum and silicon
D. aluminum and silicon
42
consumable inserts meet which AWS specification? A. 5.18 B. 5.2 C. 5.28 D. 5.30
D. 5.30
43
What is the main difference between a K and rectangular consumable insert? A. rectangular has rounded corners B. K has a J shape C. K has rounded corners D. all of the above
C. K has rounded corners
44
Which of the following shielding gases would require the highest flow rate for the flat position? A. carbon dioxide B. argon-C02 C. argon D. helium
D. helium ( the lightest gas more flow rate)
45
When is Helium the preferred shielding gas? A. shallow penetration is required B. thick or heavier-sections are welded C. light or thinner sections are welded D. metals with lower thermal conductivity are welded.
B. thick or heavier-sections are welded ( helium deepest penetration)
46
Which of the following is the heaviest gas? A. oxygen B. nitrogen C. argon D. helium
C. argon
47
Shielding gases which contain oxidizing gases may NOT be used in which process? A. GMAW B. FCAW C. GTAW D. all of the above
C. GTAW
48
What is the term for a vessel that contains a cryogenic liquid? A. demister B. dumpster C. dewar D. crucible
C. dewar
49
Which of the following would NOT be suitable for preparing a tungsten electrode to a balled end? A. AC welding current B. DCEP C. DCEN D. Reverse Polarity
C. DCEN
50
If welding current is fixed, which gas will promote the deepest penetration? A. argon B. argon-helium C. carbon dioxide D. carbon dioxide-argon
B. argon-helium
51
52
what does the term non-consumable electrode mean? A. the electrode is not melted to supply filler material B. the electrode is melted to supply filler material C. the filler metal is not consumed by the electrode D. the filler metal is consumed by the electrode
53
Concerning the filler metal designation below, what does the "49A" represent according to the CAN/CSA-ISO W48-14 filler metal classification? B-G 49A 3 A G2 A. minimum tensile strength of base metal B. minimum tensile strength of deposited metal C. maximum tensile strength of deposited metal D. maximum tensile strength of base metal
B. minimum tensile strength of deposited metal
54
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