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Weld Weldin ing g Insp ection ecti on,, Steels Steels – WIS WIS 5 As A s s ess es s men t Ques t io n Paper (MSR-AWI-1 (MSR-AWI -1 05) Name: ……………………………… ……………………………………………… ……………….. An sw er al l qu est io ns 1. What is the Arc energy for the following welding process parameters? Amps 140, Volts 21, Travel speed 250mm/min. 250mm/min. a. 0.7 KJ/mm b. 0.6 KJ/mm c. 0.01 KJ/mm d. 0.7 J/mm
2.
What is the effect of tempering after quenching a. Toughness and strength are increased. increased. b. Toughness and strength are reduced. reduced. c. Toughness reduced and strength increased d. Toughness increased and strength reduced e. Toughness increased and hardness hardness increased
3.
What is the ratio between the leg length and the design throat thickness on on a mitre fillet weld with equal leg lengths a. 1 to 1 b. 2 to 1. c. 1.414 to 1. d. All of the above above it depends depends upon the leg length length size.
WIS 5 Qu paper MSR-AWI-1 05 issue5 Date: 10/02/05
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4.
The toughness and yield strength strength of of steel is reduced reduced by: a. Reducing the grain size b. Increasing the heat input. c. Reducing the heat input. d. Both a and b.
5.
Which of the following statements is true if applicable to a charpy vee notch impact test a. It’s a destructive test used to assess materials ductility in the weld zone. zone. b. It’s a mechanical mechanical test used used to determine a welds resistance resistance to creep. creep. c. It’s a dynamic test, which is used to give give a measure measure of notch toughness. d. It’s a static test used to determine materials toughness in the notch region. region. e. Both a and c.
6.
How can you tell the difference between an EN/ISO weld symbol and a BS weld symbol? a. The EN/ISO weld symbol symbol will always have have the arrow side weld at the top of the reference line. b. The EN/ISO symbol has the welds elementary elementary symbol placed placed on a dashed dashed line lying above or below the solid reference line to indicate a weld on the other side. c. The EN/ISO symbol symbol has a fillet weld leg leg length identified identified by the letter “a”. d. The EN/ISO symbol symbol has a fillet weld throat thickness identified identified by the letter “z”. e. Both b and d.
7.
What is the possible possible effect of having the heat heat input too low during welding? welding? a. Low toughness, toughness, entrapped hydrogen and and low hardness. b. High hardness, hardness, lack of fusion and entrapped entrapped hydrogen. hydrogen. c. Entrapped hydrogen, low toughness toughness and and high ductility. d. Lack of fusion, fusion, low toughness toughness and a reduction in ductility.
WIS 5 Qu paper MSR-AWI-1 05 issue5 Date: 10/02/05
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8.
An MMA electrode classified as E7018 is: a. A basic low hydrogen hydrogen electrode containing iron powder. b. A rutile electrode containing iron powder. powder. c. A cellulose electrode suitable suitable for welding welding in all positions. d. A basic electrode depositing weld metal metal with yield strength of a least 70,000 psi. e. both a and d.
9.
The number number 135 is placed at the end of the reference line on a weld symbol. According to ISO 2553 what does this number number indicate? a. The welding welding process process is stated as MMA b. The welding welding process process is stated as TIG c. The welding welding process process is stated as as SAW d. NDT is to be carried out after welding e. None of the above
10.
Which of the following is the most likely to be considered an an essential variable for a welder qualification test? a. A change from an electrode classified to BS EN 499 as as an E46 3 INI B to an electrode classified to AWS A5.1 as an E7018. b. A change of pipe wall thickness by at least 15 mm. c. A change change in pre-heat pre-heat temperature temperature from 50oC to 100oC. d. A change from PC welding welding position to PA welding position. e. All of the above.
11 What would be a typical typical appearance of a ductile fracture surface? a. Rough randomly randomly torn and a reduction in area. b. Smooth fracture fracture surface displaying beach marks c. Step like appearance. d. Bright crystalline fracture with very little reduction in area. e. Both a and b.
WIS 5 Qu paper MSR-AWI-1 05 issue5 Date: 10/02/05
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12. In EN 499, what does the number 50 number 50 represent in the following electrode classification? E 50 3 1Ni B 160 0 1 H5. a. A minimum of 50 N/mm2 yield strength. b. A minimum of 500 N/mm2 tensile tensile strength. c. A minimum minimum of 50000 psi yield strength strength d. A minimum of 50000 psi tensile tensile strength e. None of the above.
13. Increasing the carbon content content of a steel will: a. Increase the hardness hardness and toughness b. Decrease the hardness hardness and toughness c. Increase hardness, decrease toughness d. Decrease hardness, increase toughness
14. Which of the following is applicable for the HAZ on a C/Mn steel weld if the heat input increases: a. Both hardness hardness and and width is increased. increased. b. Hardness decreases, width increases. c. Both hardness and width decreases. d. Hardness increases, width decreases.
15. What is the main reason for the application of pre-heat pre-heat a. To change the chemical composition of of the weld and parent material. material. b. The control the hydrogen and prevent prevent cracking. c. To remove residual stresses. d. Both a and b. e. All of the above
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16. Which of the following is most likely to increase the chance of solidification cracking? a. Reduction in sulphur content content of the parent material b. Increased restraint on the joint during welding. welding. c. Increase in weld hydrogen content from 15 ml/100 g to 25 m/l100 g. d. Poor through thickness ductility ductility in the the materials being welded. e. Both a and b.
17. What is the effect of full annealing compared to normalizing? a. A reduction reduction in grain size. b. An increase in grain grain size. c. An increase in toughness d. The grain size will not be affected. e. None of the above
18. Which of the following elements may cause cold shortness a. Sulphur. b. Phosphorous c. Manganese. d. Silicon
19. When considering the advantages of site radiography over ultrasonic inspection which of the following applies? a. A permanent record produced, produced, good for detecting detecting lack of sidewall sidewall fusion in a single U butt weld and defect identification. b. A permanent record produced, produced, good for the detection of all surface surface and subsurface defects and assessing the through thickness depths of defects. c. Permanent record produced, good good for defect identification and not as reliant upon surface preparation. d. No controlled areas required on site, a permanent permanent record produced produced and good for assessing pipe wall thickness reductions due to internal corrosion. e. Both a and c
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20. Which of the following materials are the most susceptible to HICC in t he weld zone a. Carbon Manganese steel b. Micro alloyed steel (HSLA). c. Austenitic steel d. Both a and b e. All of the above
21. Lamellar tearing is: a. A product product defect defect caused caused during the manufacturing manufacturing of certain certain steels steels b. A crack type, which occurs in the parent material due to welding strains acting in the short transverse direction of the parent material. c.
A type of hot hot crack crack associated associated with impurities impurities (sulphur, (sulphur, carbon carbon and and phosphorous).
d. A type of crack that occurs in the weld or parent material due to cyclic stresses. stresses. 22. Which of the following statement maybe considered correct when dealing with agglomerated fluxes? 1. 2. 3. 4. 5.
Easy addition of additive They’re less hygroscopic than other types Flaky appearance Need to bake, prior to their use Less dust tendency
A. B. C. D.
Statements 1 & 4 are correct Answer 1 and 3 are correct Answer 4 and 5 are correct Statements 1, 2,4 and 5 are correct
23. Which of the following is applicable to the heat tr eatment process of normalising carbon-manganese steel a. It is always always carried out below the lower critical limit. b. It is carried out out to ensure the material has has maximum tensile tensile strength. c. It is carried out to ensure the material is of maximum ductility ductility and malleability malleability in preparation for extensive cold working operations. d. It is carried out at approximately approximately 910oC for the purpose of grain refinement
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24. A tee joint on a support bracket is to be welded both both sides using 5 mm leg length fillet welds, each weld is to be intermittent 50 mm in length, and the gap between each weld is to be 25 mm. In I n accordance with EN 22553 which of the following symbols gives the correct representation? a.
b.
5
50 (25)
5
50
5
25 (50)
5
25 (50)
c.
(25)
5 x 50 (25) 5 x 50 (25)
d.
5 x 50 (25) 5 x 50 (25)
25. Austenitic stainless steel can be identified identified by: a. Very shiny appearance. b. Lack of magnetic attraction. c. Its extreme hardness. d. None of the above
26. Ultrasonic testing is preferable to radiographic testing testing due to: a. Its ability to detect detect all defects. b. Lower amount amount of operator operator skill skill required. required. c. Its ability to detect laminations. d. Its ability to detect detect both sub-surface sub-surface and surface defects in Austenitic stainless stainless steel.
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27. Which of the following flame types would you you expect to be used for the cutting of mild steel? a. Carburising flame. b. Oxidising flame. c. Reducing flame. d. Neutral flame.
28. The heat affected zone of a carbon carbon steel fusion weld a. Usually has the highest highest tensile strength and highest toughness toughness values values b. Usually has the lowest toughness values and and cannot cannot be avoided c. Is usually usually gamma iron phase phase and cannot be be avoided avoided d. Both a and c. e. All of the above.
29. A welding process where the welding welding plant controls the travel speed and and the arc gap, but under constant supervision using a shielding gas mixture of 80% argon – 20% carbon dioxide is termed: a. A manual MAG process. b. A semi-automatic MAG process. c. A mechanised MIG process. d. A mechanised MAG process.
30. The main reason for toe blending on certain welded components is: a. Corrosion considerations. b. Fatigue life. c.
Appearance.
d. All of the above
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