Deck 6: Shielded Metal Arc Welding Aws Sense Certification

Question 1

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

Answer 1

A

Question 2

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

Answer 2

C

Question 3

Which of the following is true of the hot pass?

A) The hot pass may not be used to fill small spots or pinholes left in the root pass.
B) A very small amount of metal should be deposited so that the resulting weld is concave.
C) The hot pass is designed to be used on critical, high-strength code welds.
D) The hot pass is ideal for covering bad welds or repairing welds of a less skilled welder.

Answer 3

B

Question 4

Raising the end of the electrode too high or moving it too far ahead of the molten weld pool can cause ____.

A) the weld pool to harden
B) burn-through
C) all of the shielding gas to be blown away from the molten weld pool
D) slag and metal to be deposited ahead of the weld bead

Question 5

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

Question 6

The last weld bead on a multipass weld is the ____.

A) root weld
B) hot pass
C) cover pass
D) filler pass

Question 7

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 8

A ____ arc prevents metal from being deposited ahead of the weld bead.

A) short
B) short to medium
C) medium to long
D) long

Question 9

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 10

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 11

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 12

The ____ technique is designed to be used on noncritical, noncode welds only.

A) hot pass
B) filler pass
C) open root weld
D) cover pass

Question 13

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 14

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 15

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

Question 16

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 17

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 18

Filler passes are made with ____.

A) a J weave pattern
B) a circular weave pattern
C) a square weave pattern
D) stringer or weave beads

Question 19

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 20

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 21

​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 22

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

Question 23

​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 24

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

Question 25

The only advantage to grooving a lap joint is ____.

A) to give additional clearance
B) to strengthen the weld
C) to increase penetration
D) to improve the design

Question 26

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

A) ​By heating the plates with a torch and squeezing them together in a vise.
B) ​By making another larger tack weld so it will pull the plates together.
C) ​By placing it on an anvil and striking it with a hammer.
D) ​There is no reason to remove these gaps, the weld will fill them up.

Question 27

​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

Question 28

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

A) ​By pushing the electrode into the root opening.
B) ​By using a long arc with high amperage.
C) ​By holding the electrode at a steep leading angle.
D) ​By changing from DCEP to DCEN or AC current.

Question 29

​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) ​None of the above

Question 30

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

Question 31

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

Question 32

​What may need to be done to the root surface of a weld that is prepared on both sides before the next weld pass(es)?

A) ​ground or gouged clean
B) ​sanded smooth
C) ​Re-tack welded
D) ​Nothing, it will be on the back anyway

Question 33

​What can be done to prevent the weld bead becoming too built up when restarting a weld?

A) ​Tapering the weld down before stopping to make the restart more even.
B) ​Start the next weld slightly in front of the ending point of the last weld.
C) ​Make an electrode change before the rod gets too short so you see the weld better.
D) ​Use a long arc on the starting electrode and hold the arc in one place so it melts the buildup down before restarting the weld.

Question 34

​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 35

​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 36

​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 37

To pass visual inspection prior to preparation for bend testing, which of the following is true of undercut?

A) It must exceed 10% of the base metal.
B) It must not exceed 10% of the base metal or 1/32 in., whichever is less.
C) It must exceed 10% of the base metal or 1/32 in., whichever is greater.
D) It must exceed 1/32 in.

Question 38

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

Question 39

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 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)

Question 41

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

Question 42

Describe the preparation of a weld specimen for bend testing.

Question 43

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

Question 44

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

Question 45

____________________ is the temperature of the metal during welding.

Question 46

Explain what preheating is and why it would be used.

Question 47

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

Question 48

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

Question 49

Explain what interpass temperature is, including minimum and maximum interpass temperatures.

Question 50

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