GMAW Test - P6
Deoxidizers in GMAW filler wires play a particularly important role when - Answer: CO2
sheilding is used
Which filler wire contains high levels of manganese and silicon and is recommended for
applications where bead appearance and low splatter are important - Answer: ER480S-5 (ER70S-
5)
The primary advantage of a constant voltage power source over a constant current power
source for GMAW is - Answer: the self-correcting voltage control
Which of the following occurs when the wire stickout is increased while GMAW with a CV power
source? - Answer: decreased penetration
When GMAW with a CV power source, wagon tracks can be minimized by - Answer: reducing
the arc voltage/increasing the arc voltage
In GMAW, the pulling technique - Answer: produces deeper penetration than the pushing
technique
characteristic of a carbon dioxide shielded arc - Answer: good surface cleaning action
The primary function of a voltmeter in the welding circuit of a CV power source is to indicate
the - Answer: load voltage
The polarity used for welding aluminum with the GMAW process is - Answer: DCEN
Which filler wire contains aluminum, titanium, and zirconium and is often selected for welding
rusty or dirty base materials - Answer: ER480S-4 (ER70S-4)
, GMAW Test - P6
Wire stickout or extension refers to the distance from the end of the - Answer: contact tip to the
base material
Which gases are recommended to minimize spatter when welding mild steel in the short circuit
transfer mode - Answer: 25% - Ar & 75% He
For short-circuit GMAW, the wire stickout distances generally from - Answer: 6.4 to 19 mm (1/4
to 3/4")
In the short circuit transfer, what is the effect of increasing the slope on a CV power source -
Answer: minimizes the voltage drop at arc reignition
What is the effect of adding small amounts of CO2 (1%-3%) - Answer: improved penetration at
wetting action
When a CV power source has been energized and the gun trigger has been actuated but no arc
has been struck, the voltmeter reading will indicate the - Answer: open-circuit voltage
The mode of metal transfer that uses the lowest voltage and current levels is - Answer: spray
transfer
When GMAW, spray transfer is only possible if the welding current is - Answer: DCEP
With constant voltage power sources, increases in arc length will - Answer: decrease voltage
To prevent cold lap when welding a 25mm thick vee-groove butt joint with the GMAW
processes - Answer: use a split bead technique to fill the joint OR focus the arc on the centre of
the joint
Deoxidizers in GMAW filler wires play a particularly important role when - Answer: CO2
sheilding is used
Which filler wire contains high levels of manganese and silicon and is recommended for
applications where bead appearance and low splatter are important - Answer: ER480S-5 (ER70S-
5)
The primary advantage of a constant voltage power source over a constant current power
source for GMAW is - Answer: the self-correcting voltage control
Which of the following occurs when the wire stickout is increased while GMAW with a CV power
source? - Answer: decreased penetration
When GMAW with a CV power source, wagon tracks can be minimized by - Answer: reducing
the arc voltage/increasing the arc voltage
In GMAW, the pulling technique - Answer: produces deeper penetration than the pushing
technique
characteristic of a carbon dioxide shielded arc - Answer: good surface cleaning action
The primary function of a voltmeter in the welding circuit of a CV power source is to indicate
the - Answer: load voltage
The polarity used for welding aluminum with the GMAW process is - Answer: DCEN
Which filler wire contains aluminum, titanium, and zirconium and is often selected for welding
rusty or dirty base materials - Answer: ER480S-4 (ER70S-4)
, GMAW Test - P6
Wire stickout or extension refers to the distance from the end of the - Answer: contact tip to the
base material
Which gases are recommended to minimize spatter when welding mild steel in the short circuit
transfer mode - Answer: 25% - Ar & 75% He
For short-circuit GMAW, the wire stickout distances generally from - Answer: 6.4 to 19 mm (1/4
to 3/4")
In the short circuit transfer, what is the effect of increasing the slope on a CV power source -
Answer: minimizes the voltage drop at arc reignition
What is the effect of adding small amounts of CO2 (1%-3%) - Answer: improved penetration at
wetting action
When a CV power source has been energized and the gun trigger has been actuated but no arc
has been struck, the voltmeter reading will indicate the - Answer: open-circuit voltage
The mode of metal transfer that uses the lowest voltage and current levels is - Answer: spray
transfer
When GMAW, spray transfer is only possible if the welding current is - Answer: DCEP
With constant voltage power sources, increases in arc length will - Answer: decrease voltage
To prevent cold lap when welding a 25mm thick vee-groove butt joint with the GMAW
processes - Answer: use a split bead technique to fill the joint OR focus the arc on the centre of
the joint
