Semi automatic welding theory exam practice
Semi-Automatic Welding Theory Quiz
Test your knowledge in semi-automatic welding techniques! This quiz covers essential topics related to GMAW and other welding processes. Perfect for aspiring welders and experienced professionals alike.
- 60 comprehensive questions
- Multiple-choice format
- Evaluate your understanding of welding principles
The arc is established through electricity?
True
False
Ozone is a problem when welding?
Mild steel
Aluminium
Copper
Stainless steel
What type of polarity does GMAW usually use?
Constant voltage (CV)
Direct current electrode negative(DCEN)
Constant current (CC)
Direct current electrode positive (DCEP)
What is another name for GMAW?
Inverter
Mig
Stick
Tig
The contact tips primary purpose?
Holding the nozzle in place
Guiding the wire
Conducting current from the welding gun to the welding wire
Directing the shielding gas flow
The diffuser is to supply shielding gas evenly around the welding wire and contact tip
True
False
Ionizing radiation damages living cells?
True
False
What type of rollers are commonly used for GMAW?
U shaped
Knuckle
V shaped
Knurled
A person can sustain arc flash from another person across the shop?
True
False
In a typical spool of wire for GMAW what percentage becomes deposited weld?
98%
71%
87%
92%
What are knurled rollers typically used for?
Stainless steel
MCAW/FCAW
Aluminuim
Hard wire
Shielding gas is used for?
Protecting weld bead from atmospheric contamination
Provide reliable arc initiation and stability
Influence the emission of fumes
All of the above
The arc from welding is how much brighter than the sun?
2x
8x
10x
5x
Which is not a part of a GMAW welding gun?
Tip
Collet
Nozzle
Diffuser
Splatter build up on the nozzle can cause?
Birdnesting
Restrict shielding gas flow
Burn back
Turbulence
"arc flash" is caused by?
Visible light
Infrared light
Gamma rays
Ultra violet light
The contact tip fits secure into the?
Liner
Trigger
Diffuser
Nozzle
The liner in GMAW welding gun set up is made from steel?
True
False
GMAW has a higher deposition rate rate compared to SMAW?
True
False
GMAW uses a ________ power source?
Constant voltage
Reverse polarity
Straight polarity
Constant current
100% C02 is used for?
Short circuit
Short circuit/globular
Short circuit/spray
Globular/spray
Inert gasses do not combine with elements in the molten weld pool?
True
False
What mixture of welding gas do we currently use?
85% Argon 10% c02 5% 02
100% Argon
75% Argon 25% c02
90% Argon 10% c02
Adding oxygen to gas mixtures will give deeper penetration?
True
False
Which is an example of an active gas?
Nitrogen
Carbon dioxide
Helium
Argon
Flow meters measure the flow of gas in?
Meters per second
Litres per hour
Revolutions per minute
Cubic feet per hour
C02 in FCAW works well for both steel and?
Stainless steel
Copper
Aluminium
Titiamuim
Proprietary mixtures are a mixture of how many gasses?
2
1
3
4
When selecting shielding gas what factors must be considered?
Type and thickness of material
Joint design
Metal transfer
All the above
Aluminum must be cleaned by removing the oxide from the base material first?
True
False
Typically argon percentage is rarely below?
50%
75%
60%
80%
On a flow meter the tube must be fixed in the?
Overhead position
Vertical position
Flat position
Horizontal position
Our typical hardwire can be used in?
Flat only
Flat and horizontal only
Vertical down
All positions
Argon is a active gas?
True
False
The wire used for GMAW process is a solid wire?
True
False
Argon is lighter than air?
True
False
The presence of nitrogen in the weld will result in?
Under cut
Crater crack
Porosity
Cold lap
In the AWS electrode classification ER70s-x what does the 70 stand for?
Yield strength
Tensile strength
Position
Wire type
In the electrode classification under CSA W48 the position designator number 0 means?
Flat and horizontal only
Flat only
All positions except vertical down
All positions
When adding oxygen to a gas mixture it is normally limited to a maximum of
2%
8%
4%
5%
The minimum amount of argon to achieve spray transfer is
85%
80%
75%
90%
A pull technique results in greater penetration over a push technique?
True
False
Arc voltage is measured between the tip of the electrode and the surface of the weld?
True
False
What causes porosity?
Work angle
Voltage to high
Excessive spatter in the nozzle
Pull technique
To much spatter can be caused by?
Shielding gas flow rate to high
Arc voltage to high
Wrong filler metal
All of the above
Which metal transfer mode is best for sheet metal?
Globular
Short circuit
Axial spray
Spray arc
Spray transfer is most often used on thick materials in the __________ positon?
Flat horizontal vertical down
All position
Flat and horizontal
Flat
Cold lap is from a weld bead roll over onto parent metal?
True
False
Bead size is affected by travel speed?
True
False
Travel angle for the gun should typically be?
10-15 degrees
45 degrees
5-10 degrees
15-20 degrees
If the travel speed is to fast the bead will be?
To much spatter
Flat and fluid
Have porosity
Undersized and ropey
Undercut is caused by?
Too little wetting wetting at the edge of weld bead
Shielding gas flow rate to high
Wrong filler metal
All the above
Spray transfer is also known as?
Dip transfer
Axial spray
Modified circuit
Globular
Too much penetration can be caused by?
Welding current too high
Travel speed to slow
Welding joint design incorrect
All the above
Pulsed transfer can be in all positions?
True
False
Which is a benefit of surfacing
Reduce cost
Prolonging equipment life
Reduce inventory of spare parts
All of the above
Which metal transfer mode occurs between 23-27 volts?
Dip transfer
Short circuit
Spray
Globular
Which is not a mode of transfer?
Short circuit
New arc
Globular
Spray
Which is one of the hardest materials used for surfacing?
Semi-austenitic steels
Tungsten
Chromium
Manganese
The harder the material is the less impact resistant it has?
True
False
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