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4th Year > Gmaw > Flashcards

Gmaw Flashcards

(75 cards)

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1
Q

What is GMAW?

A

Gas metal arc welding

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2
Q

What is mig?

A

Metal inert gas welding

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3
Q

Eyes should be protected from what when welding ?

A

Ultraviolet radiant energy
(Harmful rays)

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4
Q

Face and body should be protected why ?

A

Radiation can be reflected off shiny surfaces and cause a sunburn effect to exposed skin

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5
Q

What protective clothing is preferred when welding?

A

Dark coloured tightly woven denim

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6
Q

Is ventilation mandatory?

A

Yes

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7
Q

Extreme caution should be taken when welding metals that contain zinc why?

A

Fumes from zinc can be toxic and you can get zinc chills

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8
Q

Should valves be closed and protective caps be installed when handling cylinders ?

A

Yes

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9
Q

What are three metal transfer methods?

A

Short circuit transfer
Globular transfer
Spray arc transfer

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10
Q

The welding of sheet metal uses which metal transfer methods?

A

Short-circuit transfer

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11
Q

The globular transfer is generally avoided why?

A

Splatter problems and poor weld metal appearance

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12
Q

The spray mode of metal transfer is used for joining materials _______and greater in thickness?

A

2.4mm (3/32”)

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13
Q

When the wire speed is increased the ______ are increased

A

Amps
Current

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14
Q

What will happen if the voltage is too high or the wire is too low ?

A

Wire will burn back, feed, make contact and repeat its self over and over again sputtering and having terrible trouble

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15
Q

What will happen if voltage is too high low or wire speed is too high?

A

Stubbing
Where the wire is not burning off at a fast rate and is Accutally striking the bottom of the weld pool

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16
Q

What are benefits of flux cored welding ?

A

All positions capability, leaves a good quality weld metal deposit

Higher deposition rates than shielded metal arc welding

Low operator skill required

Metallurgical benefits that can be gained from a flux

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17
Q

Each type of shielding gas can affect the weld characteristics in what way?

A

Depth of fusion
Weld bead profile
Weld speed
Cleaning action
Mode of metal transfer

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18
Q

What is the primary purpose of shielding gas ?

A

To prevent the molten weld metal from absorbing elements such as oxygen and nitrogen from atmospheric air

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19
Q

Argon has a high or low thermal conductivity?

A

Low

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20
Q

Helium has a high or low thermal conductivity?

A

High

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21
Q

Can argon cause suffocation?

A

Yea

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22
Q

Carbon dioxide can act as an asphyxia? (True or false)

A

True

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23
Q

Co2 is the cheapest gas available? (True or false)

A

True

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24
Q

When oxygen is added to shielding gas it can help with the puddle fluidity? (True or false)

A

True

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25
Hydrogen is the lightest known element and highly combustible? (True or false)
True
26
Nitrogen is considered inert? (True or false )
True
27
Nitrogen is flammable? (True or false)
False
28
C-25(argon-carbon dioxide) is characterized by _______?
A stable arc
29
What Is the current and polarity bait GMAWof stainless steel?
Direct current electrode positive Reverse polarity
30
Gtaw(tig welding) uses what current and polarity?
Direct current electrode negative Straight polarity
31
What is the correct traverse and longitudinal gun angles for butt joint lap joint t joint and corner joint?
Transverse But joint =90 Lap joint=60 T joint=45 Corner joint= 90 Longitudinal angle 10 for all
32
Which gas is prefers for welding stainless steel?
Helium argon
33
Must the material be cleaned before welding ?
Yes if you want Hugh quality welds
34
Stainless has a high or low thermal conductivity?
Low
35
Stainless still has a high thermal expansion rate (true or false )
True
36
What is the ore of aluminum ?
Bauxite
37
Alluminum has a high or low thermal conductivity?
High
38
What is the melting point of aluminum ?
660 degrees Celsius 1220 degrees Fahrenheit
39
What precautions should be taken when dealing with the highly reflective materials ?
Eye and skin protection
40
Does aluminum develop and oxide ?
Yes
41
Alluminum coefficient of expansion is how much greater than steel ?
Almost twice as much greater than steel
42
Higher heat is needed when welding aluminum why?
To melt and form a puddle
43
GMAW enables aluminum welding to be down at high speeds. (True or false )
True
44
What gas is normally used to weld aluminum ?
Pure argon
45
What is the current and polarity use for welding GMAW aluminum
Direct current electrode positive Reverse polarity
46
Name two types of wire feeders used for welding aluminum?
Pull type Push type
47
Dirty materials will cause what problems to welds ?
Dirty welds Unstable arc Inadequate penetration Incomplete fusion
48
A lack of shielding gas will cause what problems to welds ?
Poor arc starting Dirty welds Porosity
49
What is the correct transverse gun angle for a lap seam ?
60 degrees
50
How far should the electrode stick out ?
Stainless -3/8” Aluminum -1/2” to 3/4”
51
What is stubbing?
Wire is not burning off at a fast rate and is Accutalky striking the bottom of the weld pool
52
What are the correct gas flow settings?
Stainless-15 to 20cfh Aluminum 35cfh
53
Where should the contact tip be placed ?
Recessed in alittle from nozzle about 1/8”
54
All GMAW processes need shielding gas ? (True or false )
False
55
What is the recommended lens shade for a person welding aluminum or stainless steel?
Use the darkest shade that is comfortable
56
What is the best way to prevent sparks from entering your pockets ?
Keep pocket flaps buttoned closed
57
Cylinders being stored or transported must have Thier protective caps in place, valves closed and be stored in the upright position? (True or false)
True
58
It’s recommended that at least 25 psi residual pressure remain in the depleted cylinder to avoid atmospheric contamination. (True or false)
True
59
What determines the type of metal transfer method ?
The voltage used
60
What is the recommended flow setting for shielding gas in cfh?
25cfh
61
Which gas is the lightest ?
Hydrogen
62
Argon and helium are what types of gasses ? - reactive -inert -ionized -non conductive
Inert
63
Whatbweld defect is not obvious but very common to the GMAW process ?
Cold lap
64
A mixture of carbon dioxide and argon is best to eliminate spatter on mild steel ? (True or false)
True
65
Which of the following gas mixes tends to produce low crowned welds on stainless steels ? Helium carbon dioxide Argon carbon dioxide Nitrogen carbon dioxide Argon helium carbon dioxide
Argon helium carbon dioxide
66
When 1% to 5% oxygen is added to argon shielding gas, it is to ?
Improve wetting action
67
Improperly stored stainless steel wire most often will produce welds with ? Cold lapping Slag inclusions Porosity Excessive spatter
Porosity
68
What is the prefers gas for welding stainless steel
Helium
69
When you are welding austenitic stainless steels, why must you maintain the moisture content at low levels ?
Moisture can cause porosity
70
What must u do because austenitic stainless steel has a very high coefficient of thermal expansion ?
Control distortion by balancing heat input Minimize joint restraint
71
Which organizations have written specs for GMAW filler metals ?
AWS CSA
72
When useing GMAW on mild steel with carbon dioxide shielding which type of filler wire should be selected?
Deoxidized wire
73
When wires are packaged in sealed containers what are we protecting it from ?
Moisture contamination
74
Where would u use pure argon shielding gas with GMAW?
Non ferrous metals like aluminum magnesium and Thier alloys
75
What is a characteristic of helium used as a shielding gas when used with short circuiting metal transfer ?
A uniform penetration pattern and a broader weld bead results

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