SMAW on Mild Steel Pipe Flashcards
1
Q
- Why is SMAW often chosen to weld pipe joints?
a) It takes less operator skill to use.
b) It is versatile and portable.
c) It is the cheapest and most economical welding process.
d) It is the only process that you can use in all positions.
A
- b) It is versatile and portable.
2
Q
- What would be the most effective way to reduce accidents caused by portable
grinders kicking back?
a) Keep both hands firmly on the grinder and clamp the work.
b) Keep the grinder cutting from start to stop.
c) Place the grinder on a flat surface so that it may run down to a stop.
d) Make sure the grinding wheel is in contact when power is connected.
A
- a) Keep both hands firmly on the grinder and clamp the work.
3
Q
- Why must surfaces in and around the joint be free of loose scale and other
contaminants?
a) It is easier to strike an arc.
b) You can see the joint better when welding.
c) It promotes better current flow through the base metal.
d) It prevents weld defects and the formation of harmful fumes and gases.
A
- d) It prevents weld defects and the formation of harmful fumes and gases.
4
Q
- As a general rule, when preparing groove welds for SMAW:
a) the gap should be twice as large as the root face.
b) the root face should be approximately equal to the gap.
c) the root face should be twice as large as the gap.
d) root face and gap dimensions are not important.
A
- b) The root face should be approximately equal to the gap.
5
Q
- What should you do just before making your first tack weld?
a) Increase the current setting to 25% higher than the normal root pass setting.
b) Align the inside surfaces of the pipe.
c) Strike an arc just outside the joint area to make sure the machine is turned on.
d) Remove the gap spacer.
A
- b) Align the inside surfaces of the pipe.
6
Q
- How long should the tack welds be on a 150 mm (6”) schedule 80 pipe joint?
a) 3.2 mm - 6.4 mm (1/8 - 1/4”)
b) 6.4 mm - 13 mm (1/4 - 1/2”)
c) maximum 19 mm (3/4”)
d) Length is at the discretion of the welder.
A
- c) maximum 19 mm (3/4”)
7
Q
- How many tack welds are recommended for a 150 mm (6”) pipe joint?
a) none
b) two
c) three
d) four
A
- d) four
8
Q
- What is the purpose of feathering tack welds?
a) to reduce their strength
b) so they can be removed easily as the root bead is welded
c) to make it easier to strike an arc on the tack weld
d) for complete tie-ins when welding the root bead
A
- d) for complete tie-ins when welding the root bead
9
Q
- What is the most common method used for feathering tack welds?
a) grinding
b) filing
c) oxyfuel cutting torch
d) carbon arc-air gouging
A
- a) grinding
10
Q
- When feathering, why should you leave the centre of the tack weld alone?
A
- Leave the centre of the tack weld at its full thickness in order to maintain enough tack
weld strength to hold the joint securely during welding.
11
Q
- What is likely to happen if you lengthen the arc as you come into a tack weld?
A
- Lengthening the arc decreases penetration and metal deposit, leaving the tie-in with a
low crater on the inside of the pipe.
12
Q
- How is the axis of the pipe positioned for the following positions?
a) 1G
b) 2G
c) 5G
d) 6G
A
- a) horizontal
b) vertical
c) horizontal
d) at 45° to the horizontal and vertical planes
13
Q
- Explain the 2FR position according to ASME Section IX.
A
- For the 2FR position, the pipe axis is horizontal and the axis of the deposited weld is
in the vertical plane. The pipe is rotated during welding.
14
Q
- Where is the 2G position located on the 5G-2G pipe welding project?
a) in one of the top quarters of the pipe assembly
b) in one of the bottom quarters of the pipe assembly
c) the top half of the pipe assembly
d) one quarter of the pipe located at the discretion of the welder
A
- a) in one of the top quarters of the pipe assembly
15
Q
- What two markings should you make on the 2G - 5G pipe project after tacking?
a) tack weld locations and TDC
b) overhead and 2G locations
c) left-hand and right-hand sides
d) TDC and 2G location
A
- d) TDC and 2G location
