GMAW Welding questions and answers
4. What three conditions are required for the spray transfer process to occur?☑️Correct Ans-
• Argon Shielding (or argon rich shielding gas mixtures)
• DCEP Polarity
• A current level above a critical amount called the transition current.
3. In what form is metal transferred across the arc in the axial spray metal transfer method of
GMA welding?☑️Correct Ans-• Molten metal drops
1. Why is usage of the term GMAW preferable to MIG for gas metal arc welding?☑️Correct
Ans-In the beginning the GMAW process was used to weld aluminum using argon (Ar) gas
for shielding. As a result, the process was known as MIG, which stands for metal intert gas
welding. The later introduction of CO2 and O2 to the shielding gas has resulted in the
American Welding Society's preferred term, gas metal arc welding (GMAW).
6. What ranges does the pulsed arc metal transfer shift between?☑️Correct Ans-One pulse
of high current is for the axial spray transfer. The other lower pulse of current should not
transfer any weld metal and allows the weld pool to cool and contract slightly. The total heat
input of the weld is lower than for the axial spray transfer method.
The eight components of the Pulsed Arc Metal Cyle are
Ramp Up
Overshoot
High Pulse Current
High Pulse Time
, Ramp Down
Step off Current
Background Current
Pulse Width
GMAW-P, Pulsed Arc Metal Transfer☑️Correct Ans-Dual pulsed current. One pulse of
high current is for the axial spray transfer mode and the other lower pulse of current should
not transfer any weld metal. The pulsing of the current levels permits the use of the high
amperage transfer mode and the low current allows the weld pool to cool and contract
slightly, so it is easier to control.
It is relatively easy.
7. Why is helium added to argon when making some spray or pulsed-spray transfer
welds?☑️Correct Ans-• Very hot arc for welds on thick sections, usually used in gas blends
to increase the arc temperature and penetration. Helium produces a lot of heat.
8. Why does DCEP help with welds on metals such as aluminum?☑️Correct Ans-• Cathodic
cleaning action removes high temperature oxides.
9. Why is CO2 added to argon when making GMA spray transfer welds?☑️Correct Ans-• It
allows higher weld speed, better penetration, good mechanical properties, and costs less than
the inert gases.
. What effect does shortening the electrode extension have on weld penetration?☑️Correct
Ans-• As the electrode extension distance is shortened, the weld heats up, penetrates, and
builds up less.
4. What three conditions are required for the spray transfer process to occur?☑️Correct Ans-
• Argon Shielding (or argon rich shielding gas mixtures)
• DCEP Polarity
• A current level above a critical amount called the transition current.
3. In what form is metal transferred across the arc in the axial spray metal transfer method of
GMA welding?☑️Correct Ans-• Molten metal drops
1. Why is usage of the term GMAW preferable to MIG for gas metal arc welding?☑️Correct
Ans-In the beginning the GMAW process was used to weld aluminum using argon (Ar) gas
for shielding. As a result, the process was known as MIG, which stands for metal intert gas
welding. The later introduction of CO2 and O2 to the shielding gas has resulted in the
American Welding Society's preferred term, gas metal arc welding (GMAW).
6. What ranges does the pulsed arc metal transfer shift between?☑️Correct Ans-One pulse
of high current is for the axial spray transfer. The other lower pulse of current should not
transfer any weld metal and allows the weld pool to cool and contract slightly. The total heat
input of the weld is lower than for the axial spray transfer method.
The eight components of the Pulsed Arc Metal Cyle are
Ramp Up
Overshoot
High Pulse Current
High Pulse Time
, Ramp Down
Step off Current
Background Current
Pulse Width
GMAW-P, Pulsed Arc Metal Transfer☑️Correct Ans-Dual pulsed current. One pulse of
high current is for the axial spray transfer mode and the other lower pulse of current should
not transfer any weld metal. The pulsing of the current levels permits the use of the high
amperage transfer mode and the low current allows the weld pool to cool and contract
slightly, so it is easier to control.
It is relatively easy.
7. Why is helium added to argon when making some spray or pulsed-spray transfer
welds?☑️Correct Ans-• Very hot arc for welds on thick sections, usually used in gas blends
to increase the arc temperature and penetration. Helium produces a lot of heat.
8. Why does DCEP help with welds on metals such as aluminum?☑️Correct Ans-• Cathodic
cleaning action removes high temperature oxides.
9. Why is CO2 added to argon when making GMA spray transfer welds?☑️Correct Ans-• It
allows higher weld speed, better penetration, good mechanical properties, and costs less than
the inert gases.
. What effect does shortening the electrode extension have on weld penetration?☑️Correct
Ans-• As the electrode extension distance is shortened, the weld heats up, penetrates, and
builds up less.
