Semi automatic welding theory exam practice

A detailed welding workshop with a semi-automatic welding machine in action, surrounded by various metal materials and tools, bright lighting focused on the welding arc.

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

60 Questions15 MinutesCreated by WeldingGuru764

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?

10x

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?

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

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

Semi automatic welding theory exam practice

Semi-Automatic Welding Theory Quiz

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