GMAW MIDTERM EXAM QUESTIONS AND
CORRECT ANSWERS
A pull type wire feeder is used for welding with soft and small diameter electrodes. - CORRECT
ANSWERS True
In a constant voltage welding machine, arc length remains constant with changes in electrode
extension. - CORRECT ANSWERS True
A constant voltage welding machine is commonly used for GMAW. - CORRECT
ANSWERS True
Alternating current is used for welding in overhead position on mild steel. - CORRECT
ANSWERS False
The constant voltage welding machine has a slightly sloping volt ampere curve. - CORRECT
ANSWERS True
Inadequate gas shielding is one cause of porosity. - CORRECT ANSWERS True
Poor arc starting is a symptom of a worn contact tip. - CORRECT ANSWERS True
If electrode extension is increased, welding current is decreased. - CORRECT
ANSWERS True
The letter S in the electrode designation ER70S-3 stands for short circuiting transfer. - CORRECT
ANSWERS False
, Voltage is increased by increasing the wire feed speed. - CORRECT ANSWERS False
In semiautomatic GMAW, the operator sets the welding parameters, and the welding gun is
controlled by a mechanical device. - CORRECT ANSWERS False
DCEP produces deep penetration and excellent cleaning action. - CORRECT ANSWERS True
Argon is commonly used as a shielding gas when welding aluminum with GMAW. - CORRECT
ANSWERS True
Hydrogen is used as a shielding gas when deep penetration is required. - CORRECT
ANSWERS False
Gas drift causes improper shielding of the weld area, which results in weld defects. - CORRECT
ANSWERS True
The contact tip should be sized to match the welding wire diameter. - CORRECT
ANSWERS True
___ is most commonly used for GMAW. - CORRECT ANSWERS DCEP
___ drive rolls are designed for soft welding wires. - CORRECT ANSWERS U shaped
Wire feed speed determines ___. - CORRECT ANSWERS welding current
CORRECT ANSWERS
A pull type wire feeder is used for welding with soft and small diameter electrodes. - CORRECT
ANSWERS True
In a constant voltage welding machine, arc length remains constant with changes in electrode
extension. - CORRECT ANSWERS True
A constant voltage welding machine is commonly used for GMAW. - CORRECT
ANSWERS True
Alternating current is used for welding in overhead position on mild steel. - CORRECT
ANSWERS False
The constant voltage welding machine has a slightly sloping volt ampere curve. - CORRECT
ANSWERS True
Inadequate gas shielding is one cause of porosity. - CORRECT ANSWERS True
Poor arc starting is a symptom of a worn contact tip. - CORRECT ANSWERS True
If electrode extension is increased, welding current is decreased. - CORRECT
ANSWERS True
The letter S in the electrode designation ER70S-3 stands for short circuiting transfer. - CORRECT
ANSWERS False
, Voltage is increased by increasing the wire feed speed. - CORRECT ANSWERS False
In semiautomatic GMAW, the operator sets the welding parameters, and the welding gun is
controlled by a mechanical device. - CORRECT ANSWERS False
DCEP produces deep penetration and excellent cleaning action. - CORRECT ANSWERS True
Argon is commonly used as a shielding gas when welding aluminum with GMAW. - CORRECT
ANSWERS True
Hydrogen is used as a shielding gas when deep penetration is required. - CORRECT
ANSWERS False
Gas drift causes improper shielding of the weld area, which results in weld defects. - CORRECT
ANSWERS True
The contact tip should be sized to match the welding wire diameter. - CORRECT
ANSWERS True
___ is most commonly used for GMAW. - CORRECT ANSWERS DCEP
___ drive rolls are designed for soft welding wires. - CORRECT ANSWERS U shaped
Wire feed speed determines ___. - CORRECT ANSWERS welding current
