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In a welding procedure transverse joint tensile test the following observations were made. The specimen CSA was recorded as 30mm × 20mm and the maximum load applied was recorded as 200kN. What is the UTS?
A) 33 kN/mm2
B) 333 N/mm2 C) 3333 N/mm2
D) 33 N/mm2
At what level is residual stress a problem when trying to minimize the risk of H2 cracking?
A) The stress levels have no influence on H2 cracking
B) The stress levels will need to be between 30 to 40% of the material yield stress
C) The stress levels will need to be greater than 50% of the material yield stress
D) The stress levels will need to be greater than 75% of material UTS
The similarities between BS EN 22553 and AWS A2.4 in depicting welding symbols are:
A) Both have the same rule for depicting “weld all around”
B) Both have the same rule for depicting the “other side”
C) Both have the same rule for depicting “sequence of operations”
D) Both have the same method for depicting “welding processes”
Which is the most accurate method of ensuring that the correct preheat is applied?
A) Measure it with heat sensitive crayons (tempilsticks)
B) Using a calibrated digital thermometer
C) Using heat treatment equipment with thermocouples attached and a chart recorder
D) Temperature measuring paint
Hydrogen cracking is considered a cold crack as it will not form until the weldment cools to below:
A) 500℃ B) 300℃ C) 300℉ D) 730℃
Is it permissible to allow a welder to carry out a MMA (SMAW) welding procedure test if he is not qualified?
B) Yes as long as the Welding Engineer is happy to allow it
C) Yes as long as he has a TIG (GTAW) qualification
D) Yes as long as no NDT is required on the finished weld
When using DC-ve polarity, what is the typical OCV? A) 10-40V
A butt weld has been made by MMA in a 20mm thick impact tested steel plate. The welding electrode used was a basic type, 4mm diameter. The measured welding parameters for one of the runs was 185 amps, 24 volts, using AC polarity, and an ROL of 145mm/min. What would be the arc energy?
A) Insufficient information given to calculate the arc energy
B) 1.8 kJ/mm
C) 2.9 kJ/mm
D) 0.96 kJ/mm
When MMA welding what will be the effect on the weld if the electrode was changed from DC-ve to AC?
B) Higher deposition rates
C) There would be more penetration or a slight decrease in deposition rate
D) The arc would become unstable
In a cross joint tensile test the following observations were made: Specimen width: 20mm, Material thickness: 20mm, Max Load: 180kN, Break position: Parent Plate. What is the UTS?
A) 45 KN/ ㎟
B) 450 N/ ㎟
C) 39 KN/ ㎟
D) 39 N/ ㎟
In a transverse tensile test, if the break was in the weld metal, the sample would be:
A) Acceptable if the UTS is equal to or greater than the specified UTS of the plate
B) Acceptable if the UTS is equal to or greater than the specified welding consumable UTS but below the minimum UTS of the parent material
The ease in which materials can be welded together is termed?
D) All of the above
Charpy impact tests showing a rough with torn surface after the completed test would indicate which types of failure?
C) Fatigue to ductile
One of the advantages of ultrasonic inspection in relation to radiographic testing is:
A) Access is generally only required from one side (surface) of the component being tested
B) The designated work area must be closed off by barriers, therefore safety is increased
C) Thin materials can be easily examined
D) A permanent image of the defect can be obtained
With which of the following NDE processes will BEST detect internal lack of side wall fusion on a MAG(GMAW) weld.
B) Dye penetrant
With the DPI method of inspection, after the contact time has elapsed the dye should be removed by:
A) Spraying the surface with the remover till all dye has gone then wipe with a clean cloth
B) Spraying with the developer then wiping with a cloth
C) Wipe clean, using a lint free cloth soaked in a solvent remover
D) It doesn’t matter how it is done as long as all traces of dye are removed
Which of the following would you not need to check in a welding consumable store?
A) The oven temperatures
B) Quarantined consumables
C) Calibration of the oven
D) The humidity
Prior to production welding commencing you notice that the drawing has been revised and now include a pipe with a wall thickness of 30mm, your WPS only covers wall thickness of 28mm, what course of action would you follow?
A) Continue with production welding as the difference is less than 10%
B) Apply for a concession to change the thickness to permit the welding on the 30mm wall thick pipe
C) Change the range on the WPS to 30mm and allow welding to commence
D) Allow welding to commence then apply for a concession
Who has the final responsibility of sentencing and accepting a weld on completion?
A) The contractor’s inspector
B) Site manager
C) The welder
D) The client’s inspector or certifying authority
Which one of these joints would be more susceptible to Lamellar tearing
A) U butt
B) Vee butt
C) Double butt
D) Compound weld
In general terms which of the following would require the highest preheat if all other factors were the same as per ISO BS EN 1011?
A) MMA weld with cellulosic electrodes
B) MMA weld with rutile electrodes
C) MMA weld with basic electrodes
D) MAG weld with solid wire
Which of the following microstructures is critical to the likely formation of hydrogen cracks?
When examining a completed macro test, the recorded hardness figures were 5HV points over the maximum permitted what would your course of action be?
A) Apply for a concession
B) Reject the whole procedure
C) Request a retest
D) Accept it as it is only just over the permitted value
In an all weld tensile test, the original specimen gauge length was 50mm, and after the test the increased gauge length was 70mm, what is the elongation percentage?
A) % A is 40
B) % A is 60
C) % A is 30
D) % A is 36
Which of the following is a quantitative test:
A) Bend test
C) Tensile test
What is a typical carbon equivalent for carbon manganese steel?
During root welding, which of the following would be the main cause of lack of root penetration?
A) The root gap is too large in accordance with WPS
B) Preheat was not used
C) The current is too low
D) Root face is too small
At what level is the hardness value a problem when trying to minimise the risk of H2 cracking?
A) 270 to 290HV
B) 300 to 350HV
C) 100 to 150HV
D) 160 to 200HV
Why would visual inspection of the excess weld metal at the bottom of a cross country pipeline be important?
A) It is the most difficult area to weld
B) It is the dirtiest part of pipe as it is near the ground
C) Welders always forget to weld bottom
D) It is the most difficult area to radiograph
Weld decay may be minimized by adding elements called stabilisers. These may be:
A) Vanadium/ Titanium
B) Titanium/ Niobium
C) Niobium/ Vanadium
D) Vanadium/ Titanium/ Niobium
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