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17: Review Questions
The molten metal under the welding arc is called the _____.
List four factors that a welder must consider before selecting the electrode and shielding gas.
What electrode, shielding gas, and flow rate are recommended for gas metal arc welding of 1/8″ (3 mm) 308 stainless steel using short circuit transfer? Electrode: __________ Shielding gas: __________ Flow rate: __________
What voltage, wire feed speed, shielding gas, and flow rate should be used to weld 1/8″ (3 mm) aluminum using 3/64″ (1.2 mm) diameter electrode wire and spray transfer? Voltage: __________ Wire feed: __________ Shielding gas: __________ Flow rate: __________
What voltage, wire feed speed, shielding gas, and flow rate should be used to FCAW 1/4″ (6 mm) mild steel using an E71T-1 1/16″ (1.6 mm) electrode? Voltage: __________ Wire feed: __________ Shielding gas: _________ Flow rate: __________
Which of the following welding techniques is
not
used for FCAW?
A. DCEN
B. Forehand or push angle welding
C. Perpendicular welding
D. Backhand or drag angle welding
Which of the following does the welder actually observe and control to obtain a good-quality weld bead?
A. Nozzle-to-work distance
B. Electrode extension
C. Contact tube–to-work distance
D. Arc length
What does increasing the voltage do?
A. Increases penetration
B. Increases deposition
C. Increases pool width
D. Preheats the electrode more
What does increasing the contact tube-to-work distance do?
A. Increases penetration
B. Increases deposition
C. Increases pool width
D. Preheats the electrode more
The electrode should extend _____ beyond the end of the contact tube for spray transfer with GMAW.
A. 1/4″–1/2″ (6 mm–13 mm)
B. 1/2″–1″ (13 mm–25 mm)
C. 3/4″–1 1/2″ (19 mm–38 mm)
D. 3/4″–3 3/4″ (19 mm–95 mm)
List two advantages of backhand welding over forehand welding.
_____ transfer deposits more metal for a given size electrode wire.
A. Short circuiting
B. Globular
C. Spray
D. Pulsed-spray
List two ways to reduce spatter.
The weld pool shape for a fillet weld is a(n) _____ shape.
The opening at the root pass of a butt weld is a(n) _____ shape.
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