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15: Review Questions
What does GMAW stand for? Can the terms GMAW and MIG be interchanged? Explain.
In gas metal arc welding, the arc is struck between the _____ and the _____.
True or False?
Flux and shielding gas are used to protect the weld from the atmosphere during GMAW.
A. True
B. False
Which type of current is most commonly used for GMAW welding, DCEN or DCEP?
Describe a flux cored electrode.
Which of the following does not require shielding gas?
A. GMAW
B. FCAW
C. FCAW–G
D. FCAW–S
Which type of welding machine is used for GMAW: a constant voltage machine or a constant current machine?
List four advantages and two disadvantages of GMAW as compared to SMAW.
List four advantages and two disadvantages of FCAW.
In short circuiting transfer, when does the metal from the electrode enter the weld?
In globular transfer, what forces the molten metal to leave the electrode?
Spray transfer requires the use of shielding gas that contains at least _____% argon.
During pulsed spray transfer, molten metal is transferred to the base metal during the _____ current period. This current is greater than the _____ current.
Which GMAW metal transfer methods are recommended for out-of-position welding?
True or False?
The volt-amp curve for a constant potential machine is a flat curve.
A. True
B. False
Will the current of the welding machine increase or decrease if the arc voltage increases while welding?
True or False?
If metal explodes from the end of the electrode, the inductance should be increased.
A. True
B. False
What part of a wire feeder is used to pull the electrode wire off the spool and push it to the gun?
Which of the following is not a function of a GMAW gun?
A. Make electrical contact.
B. Direct the shielding gas.
C. Maintain the correct voltage.
D. Control the welding with a switch.
In a water-cooled welding gun, what do the two hoses carry? What does the cable assembly carry?
List three shielding gases commonly used in GMAW.
List two shielding gases used in FCAW–G.
List two gases that are added to argon to eliminate the undercutting that occurs when pure argon is used with GMAW to weld steel.
What does a flowmeter control?
A. Voltage flowing to the gun.
B. Shielding gas flowing to the gun.
C. Electrode wire feeding to the gun.
D. Current flowing to the gun.
What welding lens shade is recommended for high-current GMAW/FCAW?
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