Deck 6: Shielded Metal Arc Welding Aws Sense Certification

Question 1

What advantage is there to making a root weld with a smooth uniform root contour?

A) It saves cleanup time.
B) It saves time and resources.
C) It is as important to the weld strength as the weld face.
D) All of the above

Answer 1

D

Question 2

The best way(s) to remove slag between filler weld passes is (are) ____.

A) using a hot pass
B) using an open root weld
C) chipping, wire brushing, and grinding
D) using a cover pass

Answer 2

C

Question 3

If all of the shielding gas is blown away from the molten weld pool, ____.

A) the weld will have burn-through
B) excessive spattering can result
C) excessive slag will result
D) oxides can cause porosity

Answer 3

D

Question 4

Which of the following is true of open root welds?

A) The face side is more important than the root surface on the back or inside.
B) The face side is just as important as the root surface on the back or inside.
C) The back and inside of the root surface are not important.
D) The face side is not as important as the root surface on the back or inside.

Question 5

Which of the following is true of the cover pass?

A) It should be more than 1/8 inch wider than the groove opening.
B) It should not be uniform in reinforcement.
C) It need not be free of defects such as porosity or overlap.
D) It should be neat looking.

Question 6

In the ____ method, the electrode is moved in and out of the molten weld pool as the weld progresses along the joint.

A) root gap
B) open root weld
C) key hole
D) multipass

Question 7

The hot pass uses ____ to reshape the bead.

A) higher-than-normal amperage and a fast travel rate
B) lower-than-normal amperage and a slow travel rate
C) higher-than-normal amperage and a slow travel rate
D) lower-than-normal amperage and a fast travel rate

Question 8

A weld likely will fail testing if the weld contains ____.

A) any slag inclusions
B) a long string or large pieces of slag inclusions
C) too few slag inclusions
D) slag inclusions that are too small

Question 9

How much of the plate surface next to the weld groove must be mechanically cleaned to a bright finish before welding begins?

A) 1/2 in. (13 mm)
B) 3/4 in. (19 mm)
C) 1 in. (25 mm)
D) 2 in. (50 mm)

Question 10

Which of the following statements is true of weld grooves?

A) They must be ground.
B) They must be cut into only one side of the plate.
C) The type, depth, angle, and location are usually determined by a code standard.
D) Bevels and V-grooves are best if they are cut after the parts are assembled.

Question 11

What are some of the defects that the root weld face may have that are acceptable as long as the root surface is correct?

A) Cracks and porosity
B) Undercut and overlap
C) Arc strikes and worm holes
D) N one of the above

Question 12

The ____ fuses the two parts together and establishes the depth of weld metal penetration.

A) root pass
B) backing strip
C) hot pass
D) cover pass

Question 13

A key hole can be used ____.

A) only on wide joints
B) on joints with wide, narrow, or varying root gaps
C) only on narrow joints
D) only on joints with a varying root gap

Question 14

What are backup tapes made from?

A) Carbon
B) The same metal as the test plates
C) High-temperature carbon strips
D) High-temperature ceramics

Question 15

When would higher amperage and short arc length be used to make a root weld?

A) When making a weld in the flat position.
B) When the root gap is small or there is no root gap.
C) For welds made in very thick metal.
D) When making vertical welds on thick plates.

Question 16

Leaving a backing strip on a weld may cause it to fail due to ____.

A) wear and tear on the backing strip
B) decreased penetration and increased burn-through
C) concentrations of stresses along the backing strip
D) chemical reactions between silicon dioxide in the weld and the backing strip adhesive

Question 17

As the trailing angle of an electrode is ____, penetration, depth, and burn-through ____.

A) decreased, decrease
B) decreased, increase
C) increased, increase
D) flatter, increase

Question 18

To keep a molten weld pool from becoming too large, ____ the travel speed, ____ the angle, shorten the arc length, or lower the amperage

A) increase, increase
B) decrease, increase
C) decrease, decrease
D) increase, decrease

Question 19

Wagon tracks are ____.

A) discontinuities resulting from failure to clean the convex root weld
B) the weave pattern of a hot pass
C) the small amount of metal deposited during the hot pass
D) pinholes left in the root pass

Question 20

The distance an electrode is moved from the molten weld pool and the length of time in the molten weld pool are found by watching the____.

A) electrode
B) molten weld pool
C) length of the arc
D) keyhole

Question 21

The ___________________ of electrode movement is dependent on the time required for the molten weld pool to start cooling.

Question 22

____________________ is the temperature of the metal during welding.

Question 23

The ____________________ refers to the edge of the metal burned back slightly by the electrode just ahead of the molten weld pool.

Question 24

____________________ is the application of heat to the metal before welding.

Question 25

Explain how to use a hot pass to clean out trapped slag.

Question 26

Using the AWS acceptance criteria for the bend test, discontinuities smaller than ____________________ inches are not counted for acceptance or rejection.

Question 27

____________________ is a process of cutting a groove in the back side of a joint that has been welded.

Question 28

The minimum interpass temperature is usually the same as the ____________________ temperature.

Question 29

Backup tapes can be used to control penetration and prevent ____________________.

Question 30

Plates that are thicker than ____________________ inch(es) can be grooved on both sides but may be prepared on only one.

Question 31

____________________ is used to slow the cooling rate and reduce hardening.

Question 32

When making a root weld with a straight step or "T," how do you get good root fusion to the backing strip?

A) Push the electrode into the root opening.
B) Use a long arc with high amperage.
C) Hold the electrode at a steep leading angle.
D) Change from DCEP to DCEN or AC current.

Question 33

Describe the preparation of a weld specimen for bend testing.

Question 34

The cover pass should not be more than ____________________ inch(es) wider than the groove opening.

Question 35

Summarize the criteria for visual inspection prior to preparation for bend testing.

Question 36

How can a small gap between the plate and backing strip be removed?

A) Heat the plates with a torch and squeeze them together in a vise.
B) Make another larger tack weld so it will pull the plates together.
C) Place it on an anvil and strike it with a hammer.
D) There is no reason to remove these gaps; the weld will fill them up.

Question 37

What holds the filler metal in place on an open root weld?

A) Surface tension
B) Gravity
C) Centrifugal forces on the plate
D) Nothing, that is why the weld had to be small

Question 38

What is the maximum width of the root face?

A) 1/16 in (1.6 mm)
B) 1/8 in (3 mm)
C) 3/32 in (2.4 mm)
D) 5/32 in (4 mm)

Question 39

Explain what preheating is and why it would be used.

Question 40

What is the maximum root opening?

A) 1/16 in (1.6 mm)
B) 1/8 in (3 mm)
C) 3/32 in (2.4 mm)
D) 5/32 in (4 mm)