CSWIP 3.1 QUESTION AND ANSWER SERIES
1) A solid inclusion in a welder may be:
- Entrapped slag. (answer)
- Entrapped gas.
- Lack of inter-run fusion.
- None of the above.
This is “solid” not gas!
2) Which is the following is a planar imperfection?
- Lack of sidewall fusion. (answer)
- Slag inclusion.
- Linear porosity.
- Root concavity.
3) For fillet welds it is normal practice in the UK and USA measure:
- Throat thickness.
- Leg lengths. ( answer )
- Penetration depths.
- Both 1 and 3.
Measure “Leg lengths” is easy checking on site.
4) Heavy porosity on the surface of some MMA welds made on a construction site is most likely to be caused by :
- Use of the wrong class of electrodes.
- Use of excessive current.
- Moisture pick-up in the electrode covering. ( asnwer )
- A bad batch of the electrodes.
5) Slag inclusion may be present is:
- Manual metal arc welds. (answer)
- Metal inert gas welds.
- Metal active gas welds.
- All welds.
6) The main cause of undercut is:
- Excessive amps. (answer)
- Excessive OCV.
- Excessive travel speed.
- Current too low.
7) Which group of welders is most likely to require continuous monitoring by a welding inspector?
- Concrete shuttering welders.
- Overland pipeline welders. ( answer )
- Tack welders.
- Maintenance welders.
8) Which of the following fillet welds is the strongest assuming they are all made using the same material and welded using the same WPS?
- 8mm throat of a mitre fillet. ( answer )
- 7mm leg + 2mm excess weld metal. ( throat thickness: 7*0.7=4.9mm, excess weld metal is not effect to strength of weld )
- Mitre fillet with 10mm leg. ( throat thickness: 10*0.7=7mm )
- Concave fillet with 11mm leg. ( throat thickness: least )
Throat thickness is direct effect to the strength of weld.
9) A typical included angle for MMA welding a full penetration pipe butt is:
- 350 .
- 700. ( answer )
- Dependent on the pipe diameter.
10) A fillet weld has an actual throat thickness of 8mm and a leg length of 7mm, what is the excess weld metal?
- 3.1mm ( answer )
From leg length 7mm –> design throat thickness is 7*0.7 = 4.9mm
So, excess weld metal is 8 – 4.9 = 3.1mm
11) The fusion boundary of a fillet weld is the:
- Boundary between the weld metal and HAZ. ( answer )
- Boundary between individual weld runs.
- Depth of root penetration.
- Boundary between the HAZ and parent material.
It is same with butt weld:
12) If the Visual Welding Inspector detects a type of imperfection not allowed by the application Standard he must:
- Request further NDE.
- Reject the weld. ( answer )
- Prepare a concession request.
- Reject the weld only if he considers it to be harmful.
13) BS EN 970 allows the use of a magnifying glass for visual inspection but recommends that the magnification is:
- X2 to X5. ( answer )
- X5 to X10.
- Not greater than X20.
14) The majority of welder qualification tests are carried out using unbacked joints, because:
- It is quicker and cheaper if back-gouging is not required.
- If the welding process is not TIG back purging is not required.
- All welder qualification tests are done on small diameter pipe.
- It requires more skill and increase the welders’ qualification range (answer )
15) If submerged arc welding is to be used to make butt welds, which would you be most critical of?
- The root gap tolerance ( answer )
- The angle of preparation
- The root face width
- The gas cut finish
Root Gap is very important for accessibility joint.
End !!!, any concerns and questions, please comment and we will give the correct answer.