DISCONTINUITIES Flashcards
1. A blow-hole is the same thing as:
- A special hole at the end of welds in pipe for relief of blowdown pressure
- An open gas pocket
- A crater caused by CO2
- A purge opening
1. A blow-hole is the same thing as:
b. An open gas pocket
2. Which of the following is least likely to affect service performance?
a. Undercut
b. Conformity of welds to appearance standards
c. Overlap
d. Dimensional inaccuracies
2. Which of the following is least likely to affect service performance?
b. Conformity of welds to appearance standards
3. The figure to the right indicates:
a. Incomplete fusion
b. Inadequate penetration
c. Underfill
d. “a” and “c” above
e. None of the above
3. The figure to the right indicates:
a. Incomplete fusion
4. The figure to the right indicates:
a. Root crack
b. Incomplete penetration
c. Lack of fusion
d. Hollow bead
4. The figure to the right indicates:
b. Incomplete penetration
5. The figure to the right indicates:
a. Porosity
b. Slag
c. Crack
d. Weld line
5. The figure to the right indicates:
c. Crack
6. Blow holes are internal cavities in weld caused by trapped:
a. Slag
b. Gas bubbles
c. Dust and dirt
d. Filler metal impurities
6. Blow holes are internal cavities in weld caused by trapped:
b. Gas bubbles
7. What are bits of slag, flux, oxides, or dirt trapped inside a weld called?
a. Blow holes
b. Inclusions
c. Exclusions
d. Penetrants
7. What are bits of slag, flux, oxides, or dirt trapped inside a weld called?
b. Inclusions
8. The figure #9 to the right is an example of:
a. Cold lap
b. Excessive convexity
c. Overfill
d. Overlap
8. The figure #9 to the right is an example of:
d. Overlap
9. The figure #10 to the right is an example of:
a. Insufficient throat
b. Insufficient leg
c. Undercut
d. Excessive convexity
9. The figure #10 to the right is an example of:
c. Undercut
10. Why is excessive convexity considered a weld defect?
a. Conceals porosity
b. Produces greater distortion forces
c. Concentrates stresses under load
d. Reduces the strength of the base metal
10. Why is excessive convexity considered a weld defect?
c. Concentrates stresses under load
11. Which of the following statements does NOT apply to crater crack?
a. Usually appears when the welding operation is interrupted
b. Crater cracks are usually star-shaped
c. Crater cracks progress only to the edge of the crater
d. Crater cracks always form into longitudinal weld cracks
11. Which of the following statements does NOT apply to crater crack?
d. Crater cracks always form into longitudinal weld cracks
12. What form of testing applies to WELD or BASE metal properties?
a. Visual inspection with proper mechanical gages and fixtures
b. Nondestructive testing
c. Destructive testing
d. All of the above
12. What form of testing applies to WELD or BASE metal properties?
c. Destructive testing
13. A crack running down the center of the weld from a weld crater is caused by:
a. Improper termination of a weld pass
b. Contamination from the base metal
c. Too wide a root gap
d. High current
e. Welding too slow
13. A crack running down the center of the weld from a weld crater is caused by:
a. Improper termination of a weld pass
14. A common flaw found in SAW is:
a. Burn through
b. Tungsten inclusion
c. External undercut
d. Porosity
14. A common flaw found in SAW is:
d. Porosity
15. Flaw “A” at right is called:
a. Root cracking
b. A heat sink
c. Underfill
d. Undercut
e. Suck back
15. Flaw “A” at right is called:
c. Underfill
16. A welder tells the Welding Inspector that he is confident that gas was trapped in his weld. Subsequent RT examination can verify this by identifying which of the flaws within the weld?
a. Slag inclusion
b. Oxide inclusion
c. Porosity
d. Lack of fusion
e. None of the above
16. A welder tells the Welding Inspector that he is confident that gas was trapped in his weld. Subsequent RT examination can verify this by identifying which of the flaws within the weld?
c. Porosity
17. During post-weld inspection, RT showed periodic conditions oftungsten inclusions. Follow-• up inspection should include checking for:
a. Dirty electrodes
b. Too low a current setting
c. Improper cleaning of the base metal
d. The welder dipping the GTAW electrode in the puddle
e. None of the above
17. During post-weld inspection, RT showed periodic conditions oftungsten inclusions. Follow-• up inspection should include checking for:
d. The welder dipping the GTAW electrode in the puddle
18. The flaw at “F” is a:
a. Weld interface crack
b. Transverse crack
c. Longitudinal crack
d. Incomplete fusion
e. Longitudinal delamination
18. The flaw at “F” is a:
c. Longitudinal crack
19. The flaw at “G” is a:
a. Transverse inclusion
b. Transverse crack
c. Longitudinal crack
d. Heat-affected zone crack
e. Transverse microfissure
19. The flaw at “G” is a:
b. Transverse crack
20: The flaw at “H” is a:
a. High-low fit-up
b. Longitudinal delamination
c. Lamellar tear
d. Heat-affected zone crack
e. Plate lamination
20: The flaw at “H” is a:
d. Heat-affected zone crack
21. The flaw at “I” is a:
a. Underbead crack
b. Gas pocket
c. Wagon track
d. Lamellar tear
e. Delamination
21. The flaw at “I” is a:
a. Underbead crack