MIG Flashcards
MAG is short for ____.
metal active gas welding
Which of the following tasks is done by a machine?
Maintaining the arc in semiautomatic welding processes.
Which of the following tasks are done by the welder?
Providing the joint guidance in machine welding processes.
The shielding gas used on carbon steel is ____.
carbon dioxide, or a mixture of carbon dioxide and argon
Which of the following is true of axial spray metal transfer?
There are hundreds of drops per second crossing from the wire to the base metal.
In axial spray metal transfer, the shielding gas is usually a mixture of ____.
95% to 98% argon and 2% to 5% oxygen
Which of the following is true of axial spray transfers using high current settings?
High current settings may cause the weld to be difficult to control in out-of-position welds.
Which of the following is true of globular transfer?
It is used in combination with pulsed-spray transfer.
Globular transfer occurs at a rate of ____ drops per second.
a few
In the pulsed-arc metal transfer current cycle, ____ refers to how the electric current in a transformer takes a few milliseconds to build up the magnetic field to full strength once the coil is energized.
ramp up
In the pulsed-arc metal transfer current cycle, ____ refers to the surging electrical current passing through the transformer like a wave on water.
overshoot
In the pulsed-arc metal transfer current cycle, ____ is the peak current that flows across the arc during the high current pulse.
high pulse current
In the pulsed-arc metal transfer current cycle, ____ is a function of the time it takes the magnetic field in the transformer to collapse once the coil is de-energized.
ramp down
With the addition of ____ to the argon gas, the transfer becomes progressively more ____.
helium, globular
As much as ____ can be added to the argon to increase the power in the arc without affecting the desirable qualities of the spray mode.
80% helium
GMAW power supplies are ____ type machines.
constant-voltage constant-potential
Which of the following is true of backhand welding?
It has good bead visibility and makes welds with deeper joint penetration.
Which of the following is true of perpendicular welding technique?
It has a good balance between penetration and reinforcement and is used on automated welding.
The purpose of the ____ is to provide a steady and reliable supply of wire to the weld.
electrode feed unit
GMA welding machines have ____ duty cycle.
100 percent
Which of the following is true of pull-type feed systems?
The gun is heavier and more difficult to use.
An advantage of the ____ feed system is that the bulky system of gears is eliminated.
linear
____ is a series of ridges cut into the groove.
Knurling
In the ____ feed system, the electrode must have enough strength to be pushed through the conduit without kinking.
push-type