Deck 14: Gas Metal Arc and Flux Cored Arc Welding of Pipe

Question 1

How many tack welds are needed to hold a pipe joint in alignment for welding?

A) 4, one at the 12:00, 3:00, 6:00, and 9:00 o'clock positions.
B) 5 to 6
C) It depends on the size of the tack welds.
D) The number will vary depending on the pipe's diameter.

Answer 1

D

Question 2

What is another name for the cover pass?

A) Top
B) Finish
C) Cap
D) Fillup

Answer 2

C

Question 3

The hot pass can be made ________________; however, it is more difficult to keep good fusion using the ____________technique.

A) uphill, downhill
B) downhill, uphill
C) uphill or downhill, uphill
D) uphill or downhill, downhill

Answer 3

D

Question 4

The maximum diameter of any single porosity shall not exceed ______________.

A) 1/32 in. (0.8 mm)
B) 1/16 in. (1.6 mm)
C) 3/32 in. (2.4 mm)
D) 1/8 in. (3 mm)

Question 5

Which step is critical when making a code quality weld?

A) Cleaning
B) Tack welding
C) Fitting
D) All of the above

Question 6

Why is the root pass weld started on top of a tack weld?

A) To eliminate the potential lack of fusion
B) To prevent porosity caused by the lack of shielding gas at the instant the weld starts
C) So the arc light will show the root opening and make it easier to get aligned with the root opening as the weld moves off of the tack weld
D) The root pass can be started anywhere it is comfortable for the welder to begin welding.

Question 7

For a visual inspection of a pipe weld, what is the acceptable discontinuity for overlap?

A) 1/32 in. (0.8 mm)
B) 1/16 in. (1.6 mm)
C) 3/32 in. (2.4 mm)
D) None allowed

Question 8

What is the bevel angle for the end of pipe?

A) 15^°and 45^°
B) 20^°and 45^°
C) 30^°and 35^°
D) 45^°and 50^°

Question 9

For a visual inspection of a pipe weld, what is the acceptable discontinuity for incomplete fusion?

A) 1/32 in. (0.8 mm)
B) 1/16 in. (1.6 mm)
C) 3/32 in. (2.4 mm)
D) None allowed

Question 10

Any part of the root face that has undercut or trapped slag or any area with more than ____ buildup can be ground down.

A) 1/32 in. (0.8 mm)
B) 1/16 in. (1.6 mm)
C) 3/32 in. (2.4 mm)
D) 1/8 in. (3 mm)

Question 11

What is the advantage of the fast freeze flux of some FCA welding electrodes?

A) It allows a larger weld bead in all positions to fill the joint faster.
B) The freezing effect cools the weld off faster so the weld is not as hot.
C) When the flux freezes fast, it is easier to remove since it is cold.
D) There is less flux and that is why it cools so quickly.

Question 12

The filler passes should be stopped when the surface is approximately ____________ below the pipe's outer surface.

A) 1/32 in. to 3/32 in. (0.8 mm to 2.4 mm)
B) 1/16 in. to 1/8 in. (1.6 mm to 3 mm)
C) 1/32 in. to 3/32 in. (0.8 mm to 2.4 mm)
D) 3/64 in. to 1/8 in. (1.2 mm to 3 mm)

Question 13

Which tool might be used when assembling a joint for a code quality weld?

A) High-low gauge
B) Micrometer
C) Vernier caliper
D) Outside and inside calipers

Question 14

The maximum reinforcement of the cover pass is ____________.

A) 1/32 in. (0.8 mm)
B) 1/16 in. (1.6 mm)
C) 3/32 in. (2.4 mm)
D) 1/8 in. (3 mm)

Question 15

How should the weld progress if the root opening is wider than normal?

A) Downhill
B) From the 9:00 to the 6:00 o'clock downhill and from the 9:00 to the 12:00 o'clock position uphill.
C) Uphill
D) From the 9:00 to the 6:00 o'clock uphill and from the 9:00 to the 12:00 o'clock position downhill.

Question 16

It is faster to make the root weld using the downhill technique if ______________________.

A) you can see all of the joint so you can follow it
B) the root opening is narrow so the weld has something to support it
C) the voltage is lowered by 5 to 10 volts
D) the root opening is uniform and not too wide or narrow

Question 17

Why should the pipe coupon being flame cut be caught with a pair of pliers?

A) To keep the root face from being nicked and damaged
B) If the coupon hits the floor, it can be knocked out of round.
C) The round pipe coupon can roll under a table or welder and be hard to get out.
D) So you do not have to bend down and pick it up

Question 18

According to the API code, the maximum offset for pipes of the same nominal diameter is ____.

A) 1/32 in. (0.8 mm)
B) 1/16 in. (1.6 mm)
C) 3/32 in. (2.4 mm)
D) 1/8 in. (3 mm)

Question 19

For a visual inspection of a pipe weld, what is the acceptable discontinuity for cracks?

A) 1/32 in. (0.8 mm)
B) 1/16 in. (1.6 mm)
C) 3/32 in. (2.4 mm)
D) None allowed

Question 20

Arc strikes outside of the weld groove are _____________.

A) potential defects.
B) easy to grind off if needed.
C) usually small and are no problem.
D) can be left if they are less than 1 in. (25 mm) from the groove.

Question 21

What determines the size, number, and location of tack welds on a pipe joint?

Question 22

As the 1G weld passes over the top of the pipe and starts downhill, change to a slight ________ angle that will increase to approximately a _______ angle.

A) forehand, 30^°
B) backhand, 45^°
C) perpendicular, 90^°
D) right, 90^°

Question 23

Filler passes only need to have complete fusion to the previous weld and do not need to have ________.

Question 24

What can be done to protect the contact tube tip from damage?

A) Use a high temperature insulating tape to protect the tip.
B) Use a slightly larger size contact tube tip for the wire size.
C) Spray the contact tube with WD-40 so the wire will feed smoother.
D) Recess it inside of the nozzle.

Question 25

If the contact tube tip melts, the copper from the tip might enter the weld pool and make a _____________________ in the weld.

Question 26

What should the gun angle and travel direction be for making a 1G weld from the 1:30 to 10:30 positions?

A) A 45^°forehand angle in the direction of travel.
B) A 14^°to 20^°forehand angle in the direction of travel.
C) A 30^°to 90^°backhand angle in the direction of travel.
D) A 60^°backhand angle in the opposite direction of travel.

Question 27

It is important that tack welds be made _____________________________ so that they do not become weld defects in the finished weld.

Question 28

When using the spray metal transfer method, what can happen if the tip gets too close to the work?

A) The wire may arc out and cause a lot of spatter to be thrown from the weld.
B) The shorter stickout will cause the weld to get hotter due to the reduced resistance in the shorter wire and the weld will become wider and more fluid.
C) The tip may be melted.
D) A flood of sparks as the weld pool is overheated will erupt.

Question 29

Although the welded pipe seam is ___________, it is usually easy to find by looking at the inside surface of the pipe.

Question 30

The inside and outside pipe surfaces must be ground clean back ________ from the joint.

Question 31

The ends of the tack welds must be ground to a ___________.

Question 32

The cover pass cannot be any wider than ____ wider than the groove being welded.

A) 1/32 in. (0.8 mm)
B) 1/16 in. (1.6 mm)
C) 3/32 in. (2.4 mm)
D) 1/8 in. (3 mm)

Question 33

Unless a backing ring is used, most root passes are made with the _____ process.

Question 34

Describe how the end of a pipe is to be prepared for welding.

Question 35

A small flat surface of 1/16-in. (1.6 mm) wide, called the ______ or ______, is ground or machined on the beveled edge.

Question 36

The root pass welds must start and end on the ______________.

Question 37

A s mall weld coupon may become too hot to allow you to make a good weld, so be sure to give the coupon time to ___________________.

Question 38

Why is it important to clean the outside and inside surface of the pipe next to the groove?

Question 39

How is the root pass made on pipe?

Question 40

Why are the ends of tack welds ground to a featheredge?