Welding textbook Ch 9

The polarity used with almost all GMAW applications is ____.

• DCSP

• DCEN

• DCRN

• DCEP

Which of the following is not a GMAW metal transfer method?

• Short circuit

• Solid metal

• Spray

• Globular

In the spray transfer method, the metal travels across the arc as ____.

• fine metal droplets

• large metal drops

• rotating droplets

• large pieces of molten metal

The percentage of argon in the gas mixture must be above ____ for spray transfer to occur.

• 90%

• 80%

• 65%

• 50%

Electrode wire that bunches up in a wire feeder is called a ____.

• jam

• bird's nest

• blockage

• hair spring jam

A(n) ____ switch is used to feed electrode wire through the cable to the torch.

• inch/jog
• purge

• polarity

• postflow

Which of the following statements does not apply to GMAW?

• It can be used in all positions.

• It can be used to weld magnesium.

• It can be used to weld thin sheet metal.

• It is also known as TIG welding.

Which of the following statements does not apply to short-circuiting metal transfer?

• The weld pool cools slowly.

• There is no metal transfer through the arc.

• It works well in all welding positions.

• It works well on thick metal in the overhead position.

During short-circuiting metal transfer, _____ causes the metal droplet to leave the electrode wire.

• magnetism

• the short arc

• the surface tension of the pool and pinch force

• high voltage

In the metal spray transfer method, the background current is used to _____ the arc.

• maintain

• increase the voltage in

• stabilize

• increase the strength of