Deck 11: Gas Metal Arc Welding

Question 1

How should the conduit or an extension be aligned with the grooved roller?

A) These parts are preset in the factory and must not be changed in the field.
B) They should be lightly touching the rollers so that the welding current can flow down the wire to the welding gun.
C) They should be ½ in. (13 mm) from the grooves in the roller to prevent arcing.
D) These parts should be set as close as possible without touching the roller.

Answer 1

D

Question 2

The major advantages of the vertical down position technique are ____.

A) speed and deep penetration
B) speed, shallow penetration, and good bead appearance
C) less skill is required to make sound welds
D) lack of fusion and overlap

Answer 2

B

Question 3

A ____ gap may require ____.

A) narrow, more penetration
B) narrow, less penetration
C) wide, more penetration
D) narrow, forehand welding

Answer 3

A

Question 4

Too light of a feed roller pressure can _______________.

A) prevent damage to the welding wire
B) be used to prevent bird-nesting
C) cause erratic wire feeding
D) help to reduce the roller's wear

Question 5

A weld that is high and has little or no fusion is too "cold." To correct this, ____.

A) change welding technique
B) change the weave pattern
C) increase travel speed
D) stop welding and make the needed adjustments

Question 6

The ____ the density of a gas, the ____ will be the flow rate required for equal arc protection.

A) lower, lower
B) lower, higher
C) higher, higher
D) lower, slower

Question 7

____ provide the necessary shielding because they do not form compounds with any other substance.

A) Active gases
B) Inert gases
C) Carbon blends
D) Oxygen blends

Question 8

Mixtures of argon with less than ____ percent carbon dioxide may not have enough arc voltage to give desired results.

A) 5
B) 10
C) 30
D) 50

Question 9

To make threading electrode wire easier, ____.

A) straighten about 12 in. (305 mm) of the end of the wire and cut off any kinks
B) cut off about 12 in. (305 mm) of the end of the wire
C) cut off about 2 in. (50 mm) of the end of the wire
D) straighten about 2 in. (50 mm) of the end of the wire and cut off any kinks

Question 10

____ is increased and ____ is decreased as the electrode extension is shortened.

A) Penetration, buildup
B) Buildup, penetration
C) Voltage, penetration
D) Welding current, penetration

Question 11

Slight changes in ____ can be used to control the weld as the groove spacing changes.

A) penetration
B) V-groove
C) welding gun angle
D) stickout

Question 12

Which of the following gases is the least dense?

A) Oxygen
B) Carbon dioxide
C) Argon
D) Helium

Question 13

The correct flow rate of a shielding gas can be set by ____.

A) checking the pressure of the gas
B) multiplying the nozzle size by the amperage
C) checking welding guides
D) checking the density of the gas

Question 14

Which of the following is true of mill scale?

A) The porosity it causes is most often confined to the interior of the weld.
B) It is removed even for noncode welding.
C) With GMA welding wire, deoxidizer eliminates the adverse effects of mill scale.
D) It increases the chance of rusting.

Question 15

At any one voltage setting, ____ amperage is required to melt the wire the ____ it is fed.

A) more, faster
B) less, faster
C) more, slower
D) the same, faster

Question 16

The longer the ____, the greater the ____ to the welding current.

A) electrode extension, distance
B) arc, distance
C) distance, arc
D) electrode extension, resistance

Question 17

The wire feed speed on charts are generally given in ___________________.

A) pounds for filler wire per minute
B) amperage and voltage
C) pounds per square inch of weld area
D) inches per minute

Question 18

Which of the following is true of short-circuiting arc metal transfer in the overhead position?

A) It has a large molten weld pool size.
B) It has less molten weld pool sag.
C) It has more undercut and fewer icicles.
D) It has less efficient metal transfer and more spatter.

Question 19

When used as pure gases for welding ferrous metals, ____ may produce an erratic arc action, promote undercutting, and result in other flaws.

A) oxygen
B) carbon dioxide
C) active gases
D) argon and helium

Question 20

The only difference between all GMA welding machines and some FCA welding machines is that all GMA welding machines must have a ______________.

A) cooling water system
B) shielding gas solenoid
C) air cooling fan
D) power contactor to start and stop the current

Question 21

Because of the constant-potential power supply, the welding current will change as the distance between the ____________________ and the work changes.

Question 22

____________________ is a thin layer of dark gray or black iron oxide formed during the rolling process.

Question 23

The exact shielding gas ____________________ required for a certain job will vary depending upon the welding conditions.

Question 24

The perpendicular welding gun angle produces welds that ______________________.

A) have more penetration and less reinforcement
B) have a good balance between penetration and reinforcement
C) have less penetration and more reinforcement
D) are more likely to cause burnthrough than any other welding gun angle

Question 25

What can be done to keep the spatter to a minimum when using CO₂as the shielding gas?

A) Use a leading gun angle with a higher shielding gas flow rate.
B) Maintain a very short uniform arc length while welding.
C) Make stringer bead welds with little or no weave motion.
D) Travel at a slower speed.

Question 26

Shielding gases in the gas metal arc process are used primarily to protect the molten metal from oxidation and ____________________.

Question 27

Explain how high gas flow rates can lead to contamination.

Question 28

Filler metals and fluxes usually have ____________________ added to them so that the adverse effects of the mill scale are reduced or eliminated.

Question 29

Short electrode stickout gives a _____ weld and a long stickout results in a ______ weld.

A) slower, faster
B) wider, deeper
C) higher buildup, deeper penetrating
D) hotter, cooler

Question 30

The more cost efficient welders can be, the more ___________ they and their companies become.

Question 31

The ____________________ of a wire is measured by the diameter of the circle that the wire would make if it were loosely laid on a flat surface.

Question 32

With the feed running, adjust the ____________________ so that the reel stops when the feed stops.

Question 33

____________________ is the chief determinant of how effective a gas is for arc shielding.

Question 34

Why should wire not be discarded on the floor?

Question 35

The major skill required to make acceptable GMA welds consistently is_______________.

A) to use a longer arc length with a slower wire feed speed
B) to only weld in the flat or vertical down positions when possible
C) the ability to set up the equipment and weldment
D) to keep the welding gun nozzle high enough so you can always see all of the weld pool

Question 36

At low amperages and high voltage settings the wire may___________.

A) stick to the weld and have to be cut or pulled loose
B) pop violently as a result of the uncontrolled arc
C) not reach the weld
D) need to be changed to a larger diameter

Question 37

The ____________________ refers to the angle between the GMA welding gun and the work as it relates to the direction of travel.

Question 38

Describe how to keep the weld bead straight and uniform when visibility is limited.

Question 39

What are the basic components of a GMA welding station?

Question 40

Explain what happens when spatter falls onto the shielding gas nozzle, and how this can be minimized.