Review Questions - GMAW Flashcards
Gas Metal Arc Welding
Which GMAW Transfer mode is the most prone to incomplete fusion?
- short-curcuit
- globular
- spray
- pulsed
Short-curcuit
the required electrode extenion for short-circuit transfer is;
- 6-12 mm (1/4 - 1/2 in)
- 10-15 mm (3/8 - 5/8 in)
- 15-19 mm (5/8 - 3/4 in)
- 19-25mm (3/4 -1 in)
6-12 mm (1/4 - 1/2 in)
the GMAW method that uses low currents and low voltages for all postion welding is:
- spray transfer
- globular transfer
- short-curcuit transfer
- pulsed arc
short-curcuit transfer
When GMA welding, how is the shielding gas controlled?
- regulator
- power source
- flow meter
- wire feeder
Flow meter
A power supply set to constant current mode requires a:
- voltage-sensing wire feeder
- constant-speed wire feeder
- current-sensing wire feeder
- pulse-sensing wire feeder
voltage-sensing wire feeder
The rate at which the process moves along the weld joint is called the:
- wire feed speed
- arc travel speed
- current travel speed
- heat input speed
arc travel speed
GMAW in globular transfer mode:
- uses higher current and voltage than spray
- is usually avoided due to spatter
- requires a pulsed power supply
- works better with flux injection
is usually avoided due to spatter
the distance from the end of the contact tube to the weld pool is:
- arc length
- tip-to-work distance
- requires a pulsed power supply
- works better with flux injection
tip-to-work distance
the GMAW process protects the weld pool through the use of:
- inert of reactive gases
- inert shielding gas
- granular flux
- reactive slags
inert of reactive gases
When welding the first passes of thick groove joints with weld backing:
- the first pass is done using short-circuit transfer
- the first pass is done using a drag technique
- the first pass is done using a push technique
- the first pass is done using globular transfer
the first pass is done using a drag technique
The GMAW method that uses surges of current and voltage for all position welding without spatter is:
- spray transfer
- globular transfer
- short-curcuit trasnfer
- pulsed spray transfer
pulsed spray transfer
which shielding medium is most often used for carbonsteel in short-circuit transfer mode?
- 75% argon / 25% helium
- 90% argon / 10% oxygen
- 75% helium / 25% argon
- 100% carbon dioxide
100% carbon dioxide
A power supply set to constant voltage mode reqires a:
- voltage-sensing wire feeder
- constant-speed wire feeder
- current-sensing wire feeder
- pulse-sensing wire feeder
constant-speed wire feeder
GMAW systems are usually connected as:
- electrode positive
- electrode negative
- electrode alternating
- electrode pulsing
electrode positive
When using the short-curcuit transfer mode:
- the contact tip extends out of the gas cup
- high argon gas mixtures must be used
- knurled drive rolls are most common
- a long wire stickout is held
the contact tip extends out of the gas cup
A wire hang up in the drive rollers is also referred to as?
- a tangled mess
- a wire jamb
- bird nesting or nesting
- a wire feed malfunction
bird nesting or nesting
What is the maximum distance for pushing wire, using a push type drive system?
- 3 meters (9.8 feet)
- 4.5 meters (15 feet)
- 7.62 meters (25 feet)
- none of the above
4.5 meters (15 feet)
Which shielding gas may require an in line heater at high flow rates?
- argon
- helium
- CO2
- Hydrogen
CO2
What do the letters GS mean in the following type of electrode? ER70S-GS
- grind to sound metal
- gold/silver added
- intended for single pass only
- multi pass welding only
intended for single pass only
What does the letter C stand for in the following type of electrode? ER70C-X
- carbon steel only
- composite filler metal
- cast-iron compatible
- carbon dioxide shielding required
composite filler metal
