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1. Who should have access to the WPS?
NDT operators
Inspectors only
Welders only
Welders and inspectors

2. How do we determine what the correct weld preparation (root gap, root face, included angle) should be?
By consulting the WPSs
The fabrication drawing will give all the information
The welder will decide
The inspector will recommend what is suitable

3. How are the length of tack welds during assembly and fit-up determined?
By the welder as they have extensive knowledge
The fabrication specification will give minimum tack length requirements
The fabrication drawing will give all the information
Any length of tack weld will do for assembly

4. Is it always necessary to preheat the base material before welding?
Not on sunny day
Only in accordance with the WPS
If the equipment is available it must be used
If using cellulosic rods these will provide enough heat

5. Which of the following would not be required to be checked before welding?
The welding consumables
The weld root gap
PWHT temperature range
The weld preparation

6. What does the term WPS mean?
Weld productivity specification
Welding production scheme
Welding Procedure Specifications
Work Productivity standards

7. Which standard is used for the basic requirements for visual inspection?
BS EN 17637
API 1104
BS EN 7079
BS EN 4515

8. Who is responsibilities for site safety?
Site engineer
Welding supervisor
An approved inspector
Everyone

9. Is it permissible to allow welding to be carried out in bad weather?
Never
Yes as long as there is adequate protection from the poor weather conditions
Yes a long as basic low hydrogen welding electrodes are used
Yes as long as the welder is prepared to work in the rain

10. Who has the responsibility of ensuring the welder is using the correct consumables during fabrication?
The Q/A department
Store man and the welder
Welding Engineering
The welder and the welding inspector

11. When would you measure the interpass temperature?
The highest temperature recorded in the welded joint immediately prior to depositing the next run
Immediately prior to commencing the first pass
When the welding is complete
Only required if the heat input is lower than that specified in WPS

12. During root welding, which if the following would be the main cause of burn through?
The current is too high
The root gap is too small in accordance with WPS
Preheat not used
Root face is too large

13. You notice the welders are adjusting the current on the welding set, is the allowable?
Never
The welder has the final say on voltage and current
Only if the current is within the range recorded on the WPS
As long as the welder has approval from the welding foreman

14. What course of action should be taken upon finding a welder using incorrect welding consumables?
Report the incident and record all relevant information
Allow welding to proceed if the workmanship is good
None if the tensile strength of the consumable is the same as the approved one
Change the electrode for the correct type and continue welding

15. What is the maximum OCV allowable to initiate an arc when using AC current?
1000V
10V
90V
900V

16. Why is the OCV capped at the voltage setting?
To save electricity
To prevent exploding of consumables
Allow smooth transition into welding voltage range
To reduce the risk of fatality

17. What information should be recorded as a minimum, on completed production weld?
Size and type of electrode used
Welding supervisor’s name
Welder’s identification, date and weld number
Welding inspector name

18. What is meant by the term PWHT?
Pipe weld heat treatment
Pre weld heat treatment
Post weld hydrogen tearing
Post weld heat treatment

19. Why would visual inspection of the excess weld metal at the bottom of a cross country pipeline be important?
It is the most difficult area to weld
It is the dirtiest part of the pipe as it is near the ground
Welders always forget to weld the bottom
It is the most difficult area to radiograph

20. Who has the final responsibility of sentencing and accepting a weld on completion?
The contractor’s inspector
Site manager
The welder
The client’s inspector or certifying authority

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20. Who has the final responsibility of sentencing and accepting a weld on completion?
The contractor’s inspector
Site manager
The welder
The client’s inspector or certifying authority

21. Why is it essential to clean the excess weld metal on completion of the production weld?
So it can be ready for painting
To remove any rust
To ensure it is suitably clean for visual inspection and NDT
To remove slag from the undercut

22. To assess the surface of a weld for direct inspection, the distance from the surface to the eye should be maximum of?
200mm
600mm
60mm
6000mm

23. Who should select the specific welds for NDT, to cover the 10% contractual percentage required by the specification/code?
Anyone can select the welds as its just a random choice
The welder as he knows which welds are likely to produce the least defects
This will be referenced in the inspection and test plan
Nobody, as welding is always carried out to a high standard the use of the percentage NDT is of no real value

24. In a welding procedure transverse joint tensile test the following observation were made. The specimen CSA was recorded as 25mm x 12mm and the maximum load applied was recorded as 150kN. What is the UTS?
50kN/mm2
5500N/mm2
500N/mm2
50N/mm2

25. In a transverse weld tensile test, if the break was in the weld metal, the sample would be:
Rejected
Retested
Acceptable if the UTS is equal to or greater than the specified UTS of the plate
Acceptable if the UTS is between 80-90% of specified UTS of the plate

26. In an all weld tensile test, the original specimen gauge length was 50mm, and after the test the increased gauge length was 60mm, what is the elongation percentage?
%A is 50
%A is 20
%A is 29
%A is 36

27. Some codes require the excess weld metal (weld cap) on cross weld joint tensile specimens to be flush, this is because:
Flushed caps will always break in the weld metal area
This is to remove any porosity in the excess weld metal (weld cap)
It is easier to calculate the cross sectional area of the joint when flushed
Flushed caps have fewer stress raisers and therefore give a more accurate result

28. In welder qualification testing of 20mm plates, why are side bends used instead of root and face bends?
They are easier to produce
The testing equipment can not handle thick root/face bends
Root defects are not important for welder qualification
They give more accurate indications

29. Mechanical tests are divided in two areas, identify these from the list below:
When examining a completed bend test, the angle of the bend was found to be 175 degree. The testing specification calls for the sample to have been formed through 180 degree.
The bends should be considered as failed
They should be bent to 180 degree re-examined
They should be acceptable as the reduction in angle is due to material spring back
They should be rejected as the angle is not close enough to be acceptable.

30. Charpy testing is carried out on a welding procedure test plate because?
It gives an indication of the through thickness ductility (in the Z direction)
The impact test results can be used to verify that the material has not been adversely affected by the heat of the welding
It give an indication of the materials elongation properties
It give a quick indication of the weld quality for welder qualification tets

31. Charpy impact tests allowing a flat but rough surface after the completed test, this would indicate which type of failure?
Fatigue
Ductile
Fatigue to ductile
Brittle

32. A butt weld has been made by MMA in a 50mm thick impact tested steel plate. The welding electrode used was a basic type, 5mm diameter. The measured welding parameters for one of the runs was 220 amps, 21 volts, using DC+ve polarity and a ROL of 270mm per minute. What would be the arc energy?
Insufficient information given to calculate the arc energy
1.54 kJ/mm
1.026kJ/mm
2.82kJ/mm

33. When using DC+ve polarity, what is the typical OCV?
20V
50V
90V
240V

34. When MMA welding what will be the effect on the weld if the power source was change from DC+ve to AC?
None
It would have been easier for the welder to strike the arc
It would be slightly increase the depth of penetration
It would slightly decrease the depth of penetration

35. What would the effect be if the polarity were changed from DC+ve to DC-ve?
None
Greater deposition rate
Greater penetration
Less deposition rate

36. Would you consider which of the following processes uses a flat characteristic?
MAG (GMAW)
MMA (SMAW)
TIG (GTAW)
SAW using greater than 1000 amps

37. When welding medium carbon steel plates over 50mm in thickness for basic electrodes require any pre-treatment before use?
None if they were in a vacuum pack
None if they were used in a factory
Heat to 500degree C for 2 hours is used outside
Baked at 150degree C for 4 hours prior to use

38. Which of the following defects are not associated with MMA (SMAW) welding process?
Isolated pores
Lack of fusion
Undercut
Tungsten inclusions

39. Slag line found in MMA welds are usually associated with:
The voltage being too low
The open circuit current being too hight
Improper cleaning between weld runs
Low open circuit voltage

40. With which of the following NDE processes is it possible to detect both surface and slight sub-surface detect up to 2mm below the surface.
Visual
Dye penetration
Magnetic particle using DC
Magnetic particle using AC

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41. For MPI using the prods method, which of the following statements is true:
It may cause arc damaged on the specimen material surface
It requires fewer operators therefore is easier
It can be used with ferrite and non-ferrite materials
It is quicker than using a yoke type electromagnet

42. With the DPI method of inspection, after the contact time has elapsed the dye should be removed by:
Spraying the surface with the remover till all dye has gone then wipe with a clean cloth
Spraying with the developer the wiping with a cloth
Wipe clean, using a clean cloth soaked in the solvent remover
It does not matter how it is done as long as all traces of dye are removed

43. Which of the following commonly used radioactive isotopes has the longest half life?
Iridium 192
Cobalt 60
Thulium 170
Ytterbium 169

44. A 300mm diameter pipe, 8mm wall thickness is to be radiographed using the double wall single image technique. The source to be used is iridium-192. Which if the following statement is true?
It should not be done as the thickness is below that recommended
It would be better to use a cobalt 60 source in the instance
There are not problem with the technique
Only the double wall, double image technique should be used with iridium

45. Half life is a term used to describe
The penetrating ability a gamma source
Half the total time a gamma source will be useful
The time taken for the gamma source to reduce its strength be half
The rate of decay of an X-ray tube

46. What is the greatest disadvantage of radiographic inspection?
Its inability to size defect accurately
The physical size of the equipment
The skill level of the inspectors
The harmful effects of ionizing radiation

47. Which of the following defects are unlikely to be detected by normal radiographic techniques?
Intergranular corrosion cracking
Porosity
Slag
Lack of penetration

48. For ultrasonic testing, which of the following statements is true?
It is easy to identify all defects
The equipment should be calibrated before use
The equipment can not be automated
Sound waves will not travel through copper

49. Hydrogen cracking is considered a cold crack as it will not form till the weldment cools to below:
500 0C
3000C
3000F
7300C

50. Inspection for hydrogen cracking is often specified to be done between 48 to 75 hours after completion of the weld, this is because?
The stress level will have reduced by then
Applying a stress relief heat treatment after welding
Avoiding stress concentrations
It is the maximum time it takes for all the H2 to diffuse out of the weld

51. At what level is H2 considered to be more critical in cracking?
Less than 5ml per 100g of weld metal deposited
Between 5 and 10ml per 100g of weld metal deposited
Between 10 and 15ml per 100g of weld metal deposited
Over 15ml per 100g of weld metal deposited

52. Which of the following electrode types would produce the highest levels of hydrogen?
Basic electrode when baked correctly
Cellulose in a sealed tin
Rutile
Heavy rutile

53. Assuming the same materials and welding procedure were used, which of the following situation would require the highest preheat?
Butt weld in 30mm plate
Tee joint but weld in 20mm plate
Tee joint fillet weld in 20mm plate
Cruciform joint in 20mm plate

54. In general term which is the following would require the highest preheat if all other factor were the same as per ISO BS EN 1011?
MMA weld with cellulose electrodes
MMA weld with rutile electrodes
MMA weld with basic electrodes
MAG weld with solid wire

55. Which of the following microstructures is critical to the likely formation of hydrogen cracks?
Austenite
Ferrite
Pearlite
Martensitic

56. Basic electrodes are often sold vacuum packed. The reason is:
They have been packed at the manufacturers at a hydrogen level less than 5ml per 100g of weld metal deposited
They are mass produced which makes there electrodes cheap
They require less baking time after removal from the packet
They are formulated that once open they will pick up no more moisture

57. On inspecting a completed weld which has charpy impact requirements some small areas of undercut have been found. The welder says he can quickly put this right by depositing a thin narrow bead along the undercut. In the situation would you?
Agree to go ahead with no preheat as the weld is so small
Agree to go ahead with the same preheat as the original weld
Agree to go ahead with a preheat 50 degree C below original
Only allow the welder to cosmetically blend out the undercut

58. With regards to Lamellar tearing, a buttering layer will:
Improve ductility
Disperse heat
Improve toughness
Improve hardness

59. Lamellar tearing can be detected by which of the following NDE methods?
Radiography
Ultrasonic
Eddy current
MPI using AC

60. A fatigue fracture can be identified (from examination of the fracture …):
The presence of beach marks
The presence of plastic deformation
Being rough and torn
Being flat and rough
Nguyen Duy Bien
 

Enjoy learning and researching, reading book. Knowledge welding inspection painting inspection.

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Pritesh valandJessiMUHAMMAD JAMIL Recent comment authors
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Jessi

Nice

MUHAMMAD JAMIL
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MUHAMMAD JAMIL

NICE INFORMETION

Pritesh valand
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Pritesh valand

Nice information sir