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.