CSWIP – WIS5-90516b PART 1

Q 1: D

  • Section 4.1.3, impact toughness test.

Q 2: B

  • Section 4.1.6 and figure 4.16, side bend test.

Q 3: A

  • Section 6.3, welder qualification to make a sound weld, defect free.

Q 4: B

  • Section 2.3, “toe” definitions, and figure 6.31 – concave fillet weld.

Q 5: C

  • Root bead penetration mainly influenced by root gap.

Q 6: D

  • Section 3.6.1, undercut sharpness due to high travel speed, high welding current, lowest heat input gives to high hardness.
  • Section 10.3 heat input determine.

Q 7: A

  • Hardness test is another NDT method.
  • Root beads made with low amperage and voltage to control penetration; it may not occur tungsten inclusion.

Q 8: D

  • Section 2.6.2 shape of fillet welds, throat thickness.

Q 9: D

  • Section 1.1, basic requirements for visual inspection.

Q 10: A

  • Section 1.1.5, duties of welding inspector.

Q 11: D

  • Incomplete root penetration means fusion face of root are not melted, see Figure 3.18.
  • “Excessive root gap given more root penetration or excess penetration”.

Q 12: A

  • Incomplete root fusion or lack of root fusion, one fusion face of root is not melted, see Figure 3.16.
  • __Answer B, root gap to large give more penetration.
  • __Answer C, root face being too small easy to melt the root edge.
  • __Answer D, Amperage too high given more penetration.

Q 13: D

  • “flaws” is other name of defects, most using in API specification.
  • Keyword “the most serious” mean the most of project specification are not accepted the defect like surface planer defect, crack, …
  • __Answer A, B, C may be accepted if these imperfections are allowed by Acceptance Criteria, see An Acceptance Levels at page 595 or Appendix A2-36.
  • __Arc strikes are not permitted for plate/pipe and macro.
  • __An arc strike is a type of crack, can produce a hard HAZ, lead to serious cracking in-service.
  • __Better to blend smooth and then MPI for surface detection.

Q 14: C

  • See Section 3.6.10 or Figure 3.28.
  • Root gap too large or high welding current may occur burn-through defect.

Q 15: B

  • Answer A, not correct at “quality only”.
  • Answer C, not correct, specification not only for “finished product”.
  • Answer D, not correct, code of practices may be standard, recommend practices (RP), or procedures, …

Q 16: A

  • Solid inclusion such flux, oxide, tungsten, slag trapped in the weld metal.
  • See Section 3.4.

Q 17: A

  • Planar imperfection such lamination, crack, lack of fusion (sidewall, root, inter-run, cap).
  • Slag / porosity is a non-planar defect.

Q 18: B

  • Throat thickness (actual) is extremely hard to measure, it will calculate by 1.141 times leg length. It may check in the macro sample.

Q 19: C

  • Face tension –> face bend
  • Root tension –> root bend
  • Side tension –> face bend

Q 20: C

  • Key works “heavy porosity, MMA, site, is most likely” are considered moisture contents.

Q 21: A

  • MIG and MAG welding process use a solid wire welding consumable, defect not included slag.
  • MMA, slag produce from covered electrode, for weld pool protection from atmosphere, it may trap in the weld metal.

Q 22: A

  • Key word “main cause, undercut is”, best answer is excessive amps or high welding current.
  • Other cause may be high travel speed.

Q 23: B

  • Key words “is most likely, continuous monitoring”, best answer is B for pipe welder.

Q 24: A

  • Key words “strongest, fillet welds”, which one given thicker of throat thickness.
  • See Section 2.6.1.

Q 25: B

  • Keywords “included angle, full penetration, pipe butt joint, MMA”, best practice is 70 degree.
  • See Section 2.4.1 and Figure 2.11.

Q 26: C

  • Answer: 8 – 7*0.7 = 3.1 mm in throat thickness.
  • See Figure 2.28.

Q 27: A

  • Fusion boundary or fusion line see Figure 2.8 or Figure 2.9.

Q 28: B

  • Keyword “not allowed by the application standard” means defects, defect is not allowed.
  • See Section 3.1, or acceptance level sheet in appendix A2-36.

Q 29: B

  • Keyword “a magnifying glass” and see Section 1.1.4, appendix 5.

Q 30: D

  • See Section 6.3 and Section 6.3.2.

Q 31: C

  • Common occur SAW process because high current, DC EP polarity.
  • Reduce arc blow by change DC to AC power source.

Q 32: A

  • E6013/E7016 classified in AWS A5.1.
  • E 51 33 B, number “51” is min. yield strength and “33” is min. absorbed energy is not classified in ISO 2560.
  • See Figure 16.3.

Q 33: B

  • Keyword “stovepipe” or “country pipeline”, root bead made by Cellulosic electrode, downhill position (PF).
  • See Section 11.3.5.

Q 34: A

  • See Section 11.3.5 and Table 16.1.

Q 35: B

  • Max. weld bead > low travel speed > high heat input > low toughness.
  • See Figure 2.38 – weave bead, Section 10.3 – heat input influence.
  • Note: Heat input / arc energy major influence on the travel speed.

Q 36: C

  • Filler rods/cored wire/sticks of MMA electrode is a general of low-quality rimming steel.
  • See Section 16.1.

Q 37: B

  • Keyword “slope-out”, also learning slope-up.
  • See Section 12.4 and 12.5.

Q 38: C

  • Keyword “manual welding, power source or drooping characteristic”.
  • See Section 10.5.1 and Figure 10.1.

Q 39: D

  • Keyword “penetration, controlled”.
  • See Section 10.3.1.

Q 40: C

  • Keyword “purged with Ag, backing gas” for purpose avoid excessive oxidation or control root bead.
  • See Section 12.2.6.

Q 41: B

  • Filler rods/cored wire/sticks of MMA electrode is a general of low-quality rimming steel, refer Question 36 of this part.
  • The coating contains many elements and compounds.
  • See Section 16.1.

Q 42: A

  • See Section 16.1.

Q 43: B

  • See Section 16.4

Q 44: C

  • Keyword “AWS A2.4, other side”, see Section 9.12.

Q 45: D

  • Keyword “low hydrogen or hydrogen scale”.
  • See Section 11.3.5 and Section 17.3.3, or EN 1011-2.

Q 46: A

  • Keyword “hydrogen control”, see Figure 16.3 (letter H5) is a max. scale of hydrogen. See Annex C2 of EN 1011-2.

Q 47: C

  • Keyword “weld toes to be smoothly blended on the other side”,
  • Other side shall be placed on the dash-line.
  • See Section 9.4 and 9.8.

Q 48: D

  • Heat input and arc energy, see Section 10.3.

Q 49: C

  • Keyword “creep resistance”, See Section 7.3.

Q 50: A

  • Accessing quality of weld, or quality of joint.
  • See Section 4 and Section 4.1.7.

Các topic liên quan

  • Homework (Appendix cuối sách) –> here.
  • CSWIP 3.1 – notes –>here.
  • CSWIP 3.2 – answers –> here.

See Part 2 to 4 and notes at CSWIP


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