CSWIP: Welding Inspector Exam Quiz!

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CSWIP: Welding Inspector Exam Quiz! - Quiz


Do you know what a welding inspector does? A welding inspector is a technical expert who examines welded metal items in buildings, infrastructures, and manufactured goods, which safeguards the parts as they are securely bonded. Welding inspectors investigate the bonds and links between metals. In other words, they safety check to see if the weld has been completed correctly. This quiz will help you pass the exam. Good luck with it.


Questions and Answers
  • 1. 

    What is the arc energy for the following welding process parameters? 

    • A.

      0.7 KJ/mm

    • B.

      0.6KJ/mm

    • C.

      0.01KJ/mm

    • D.

      0.7KJ/mm

    Correct Answer
    A. 0.7 KJ/mm
    Explanation
    The given welding process parameters are measured in KJ/mm, which stands for kilojoules per millimeter. The answer, 0.7 KJ/mm, indicates that the arc energy for the welding process is 0.7 kilojoules per millimeter.

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  • 2. 

    In an all weld metal tensile test, the original test specimens gauge length of 50mm after testing the gauge increased to 72mm, what is the elongation percentage?

    • A.

      44%

    • B.

      144%

    • C.

      69.4%

    • D.

      2.27%

    • E.

      The elongation is not normally tested in this test

    Correct Answer
    A. 44%
    Explanation
    The elongation percentage can be calculated by subtracting the original gauge length from the final gauge length, dividing it by the original gauge length, and then multiplying by 100. In this case, the original gauge length is 50mm and the final gauge length is 72mm. So, the elongation percentage would be ((72-50)/50) * 100 = 44%.

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  • 3. 

    What is the ratio between the leg length and design throat thickness on 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 it depend upon the leg length size

    Correct Answer
    C. 1.414 to 1
    Explanation
    The ratio between the leg length and design throat thickness on a mitre fillet weld with equal leg lengths is 1.414 to 1. This means that the leg length is 1.414 times greater than the design throat thickness.

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  • 4. 

    The toughness and yield strength of steel is reduced by:

    • A.

      Reducing the grain size

    • B.

      Increasing the heat input

    • C.

      Reducing the heat input

    • D.

      Both a and b

    Correct Answer
    B. Increasing the heat input
    Explanation
    Increasing the heat input can reduce the toughness and yield strength of steel. This is because when the heat input is increased, it can cause the formation of larger grains in the steel microstructure. Larger grains result in decreased strength and toughness, as they provide less resistance to deformation and fracture. Therefore, increasing the heat input can lead to a reduction in the mechanical properties of steel.

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  • 5. 

    Which of the following statments is true if applicable to a charpy vee notch impact test?

    • A.

      It's destructive test used to assess material ductility in the weld zone

    • B.

      It's a mechanical test used to determine a welds resistance to creep

    • C.

      It's destructive test, which is used to give a measure of notch toughness

    • D.

      It's a static test used to determine material toughness in the notch region

    • E.

      Both a and c

    Correct Answer
    E. Both a and c
    Explanation
    The Charpy Vee notch impact test is a destructive test that is used to give a measure of notch toughness in a material. It assesses the material's ability to absorb energy in the presence of a notch or defect. This test is commonly used to evaluate the ductility and toughness of materials, including those in the weld zone. Therefore, both statement a and c are true.

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  • 6. 

    Haw can you tell the diffrence between an EN/ISO weld symbol and a BS weld symbol?

    • A.

      The EN/ISO weld symbol will always have the arrow side weld at the top of the reference line

    • B.

      The EN/ISO weld symbol has the welds elementary symbol placed on a dashed line lying above or below the solid reference line to indicate a weld on the other side

    • C.

      The EN/ISO weld symbol has a fillet weld leg length identified by the letter "a"

    • D.

      The EN/ISO weld symbol has a fillet weld throat thickness identified by the letter "z"

    • E.

      Both b and d

    Correct Answer
    B. The EN/ISO weld symbol has the welds elementary symbol placed on a dashed line lying above or below the solid reference line to indicate a weld on the other side
    Explanation
    The EN/ISO weld symbol differs from the BS weld symbol in that it has the welds elementary symbol placed on a dashed line above or below the solid reference line to indicate a weld on the other side. This means that when using the EN/ISO welding symbol, the placement of the elementary symbol provides information about the location of the weld on the other side of the joint. In contrast, the BS weld symbol does not have this specific feature.

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  • 7. 

    What is the possible effect of having heat input too low during welding? 

    • A.

      Low toughness,entrapped hydrogen and low hardness

    • B.

      High hardness,lack of fusion and entrapped hydrogen

    • C.

      Entrapped hydrogen ,low toughness and high ductility

    • D.

      Lack of fusion ,low toughness and reduction in ductility

    Correct Answer
    B. High hardness,lack of fusion and entrapped hydrogen
    Explanation
    Having a heat input that is too low during welding can lead to high hardness, lack of fusion, and entrapped hydrogen. High hardness occurs because the low heat input does not allow for proper heat treatment of the weld metal, resulting in a harder and more brittle weld. Lack of fusion refers to the incomplete bonding between the base metal and the weld metal, leading to weak joints. Finally, entrapped hydrogen occurs when the low heat input does not provide enough energy to release the hydrogen gas that is produced during the welding process, resulting in hydrogen being trapped within the weld and causing potential cracking and porosity.

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  • 8. 

    An MMA electrode classified as E7018 is:

    • A.

      A basic low hydrogen electrode containing iron powder

    • B.

      A rutile electrode containing iron powder

    • C.

      A cellulose electrode suitable for welding in all positions

    • D.

      A basic electrode depositing weld metal with tensile strength of a least 70,000 psi

    • E.

      Both a and d

    Correct Answer
    E. Both a and d
    Explanation
    E7018 electrodes are basic low hydrogen electrodes containing iron powder. Additionally, they are known for depositing weld metal with a tensile strength of at least 70,000 psi (pounds per square inch). This classification (E7018) refers to a type of MMA (Manual Metal Arc) electrode that is commonly used in welding applications. It is classified as "basic" because it contains a basic flux coating, which helps to protect the weld from impurities and contaminants. It is also classified as "low hydrogen" because it has a low moisture content, which reduces the risk of hydrogen-induced cracking in the weld. The addition of iron powder helps to improve the deposition rate and overall performance of the electrode.

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  • 9. 

    The number 135 is placed at the end of the reference line on a weld symbol according to ISO 2553 what does the number indicate?

    • A.

      The welding process is stated as MMA

    • B.

      The welding process is stated as TIG

    • C.

      The welding process is stated as SAW

    • D.

      NDT is to e carried out after welding

    • E.

      None of the above

    Correct Answer
    E. None of the above
    Explanation
    According to ISO 2553, when numbers are placed at the end of the reference line on a weld symbol, they typically indicate the welding process to be used according to an established list of process numbers. In this context, the number 135 refers to the Metal Active Gas (MAG) welding process using solid wire. However, since this specific process or the exact correspondence to the options provided isn't listed, the correct interpretation based on the options given would be "None of the above."
    ISO standards often update their specifications and coding systems, so it's crucial to refer to the most current version of the standard for accurate information. The options listed (MMA, TIG, SAW) represent different types of welding processes:
    MMA: Manual Metal Arc Welding
    TIG: Tungsten Inert Gas Welding
    SAW: Submerged Arc Welding
    And none of these directly correspond to the process number 135 under ISO standards, which more closely aligns with MAG welding. Thus, "None of the above" would be the correct choice based on the provided options.

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  • 10. 

    Which of the following is the most likely to be considered an essential variable for a welder qualification test?

    • A.

      A change from an electrode classified to BS EN 499 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 in pre-heat temperature from 50°C to 100°C

    • D.

      A change from PC welding position to PA welding position

    • E.

      All of the above

    Correct Answer
    B. A change of pipe wall thickness by at least 15 mm
    Explanation
    A change of pipe wall thickness by at least 15 mm is the most likely to be considered an essential variable for a welder qualification test because it involves a significant change in the welding conditions. This change in pipe wall thickness can affect the heat input, welding technique, and overall weld quality, making it crucial for a welder to demonstrate their ability to adapt to different thicknesses. The other options mentioned in the question may also be important variables to consider, but a change in pipe wall thickness is typically a more critical factor in welder qualification tests.

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  • 11. 

    What would be a typical appearance of a ductile fracture surface?

    • A.

      Rough randomly torn and a reduction in area

    • B.

      Smooth fracture surface displaying beach marks

    • C.

      Step like appearance

    • D.

      Bright crystalline fracture with very little reduction in area

    • E.

      Both a and b

    Correct Answer
    A. Rough randomly torn and a reduction in area
    Explanation
    A ductile fracture surface typically appears rough and randomly torn, with a noticeable reduction in the area of the fractured material. This is because ductile materials have the ability to deform and stretch before breaking, resulting in a jagged and torn appearance. Additionally, the reduction in area indicates the extent of plastic deformation that occurred before the fracture.

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  • 12. 

    Which of the following under typical conditions using the MMA welding process would give the deepest penetration?

    • A.

      DC-ve

    • B.

      DC+ve

    • C.

      AC

    • D.

      Both a and b

    Correct Answer
    B. DC+ve
    Explanation
    DC+ve refers to direct current with positive polarity. In the MMA welding process, the electrode is connected to the positive terminal of the power source. This configuration allows for deeper penetration because the positively charged electrode attracts negatively charged electrons from the workpiece, creating a concentrated heat source. This concentrated heat results in a deeper weld penetration, making DC+ve the correct answer for achieving the deepest penetration in typical conditions using the MMA welding process.

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  • 13. 

    The inclusion rate an inductance in the welding circuit when using the MIG/MAG welding process is to:

    • A.

      Control the rate of spatter in the dip transfer mode

    • B.

      It enable the welder to weld in position with the spray transfer mode

    • C.

      It allows for thicker filler wires to be used(2.6-3.6mm diameter)

    • D.

      It allow full control over droplet size in the spray transfer mode

    Correct Answer
    A. Control the rate of spatter in the dip transfer mode
    Explanation
    The inclusion of an inductance in the welding circuit when using the MIG/MAG welding process is to control the rate of spatter in the dip transfer mode. Spatter refers to the small droplets of molten metal that can be produced during the welding process. By controlling the rate of spatter, the welder can achieve a cleaner and more precise weld. The inductance helps to regulate the current flow and reduces the likelihood of excessive spatter, resulting in a better quality weld.

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  • 14. 

    An undesirable property of aluminium oxide residue ,when welding is that it:

    • A.

      Decreases weld pool fluidity

    • B.

      Requires more heat to melt it when compared to aluminium

    • C.

      Causes the welder to travel to quickly

    • D.

      The presence of the oxide makes aluminium impossible to weld

    Correct Answer
    B. Requires more heat to melt it when compared to aluminium
    Explanation
    Aluminium oxide residue is formed on the surface of aluminium during welding. This residue acts as a barrier and makes it more difficult to melt the aluminium. Therefore, more heat is required to melt the aluminium oxide residue compared to the aluminium itself. This can affect the welding process as it may require higher temperatures or longer welding times to achieve proper fusion.

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  • 15. 

    When welding with the MIG welding process using pure argon as the shielding gas on carbon steel, which of the following problems are likely to occur?

    • A.

      Copper inclusion and excessive cap heights

    • B.

      Excessive root penetration and porosity

    • C.

      Slag inclusion and crater pipe

    • D.

      Lack of fusion and poor cap profiles

    Correct Answer
    B. Excessive root penetration and porosity
    Explanation
    When using pure argon as the shielding gas in MIG welding on carbon steel, excessive root penetration and porosity are likely to occur. Excessive root penetration refers to the weld penetrating too deeply into the base metal, which can weaken the joint. Porosity refers to the presence of small gas pockets within the weld, which can also weaken the joint and make it more prone to cracking. Using pure argon as the shielding gas can lead to these issues because it does not provide enough oxygen to promote proper weld penetration and prevent the formation of gas pockets.

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  • 16. 

    When considering the tungsten arc welding process what is the purpose of the down-slope (slope -out)control?

    • A.

      Ensure good penetration

    • B.

      To prevent the arc striking on the parent material

    • C.

      To help prevent the formation of crater pipe and possible cracking

    • D.

      To help prevent tungstan inclusion during welding

    Correct Answer
    C. To help prevent the formation of crater pipe and possible cracking
    Explanation
    The down-slope control in tungsten arc welding is used to help prevent the formation of crater pipe and possible cracking. Crater pipe refers to a depression or groove that can form at the end of a weld, and it can lead to cracking if not properly managed. By controlling the down-slope, the welding process can be gradually slowed down, allowing the crater to be filled and preventing the formation of a pipe. This helps to ensure a smooth and strong weld without the risk of cracking.

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  • 17. 

    When considering thermal cutting local hardening can be reduced by:

    • A.

      Increasing the cutting speed

    • B.

      The use propane as a fuel gas

    • C.

      Pre heating the material to be cut

    • D.

      All of the above

    Correct Answer
    C. Pre heating the material to be cut
    Explanation
    Preheating the material to be cut reduces local hardening when considering thermal cutting. This is because preheating raises the temperature of the material, making it more ductile and less prone to hardening during the cutting process. By increasing the material's temperature, it becomes easier to cut and reduces the risk of hardening, resulting in a smoother and more efficient cutting process. Increasing the cutting speed and using propane as a fuel gas may have their own benefits but they do not directly address the issue of local hardening.

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  • 18. 

    In a semi-automatic welding process, which of the following shielding gas/gas mixtures would normally give the deepest penetration on steel?

    • A.

      100% argon

    • B.

      100% CO2

    • C.

      75% argon +25% CO2

    • D.

      All of the above would give the same depth in penetration

    Correct Answer
    B. 100% CO2
    Explanation
    In a semi-automatic welding process, 100% CO2 would normally give the deepest penetration on steel. CO2 has a higher heat input compared to argon and the mixture of argon and CO2, which allows for deeper penetration into the steel. Argon and the mixture of argon and CO2 may be used for different purposes in welding, but in terms of achieving the deepest penetration, 100% CO2 is the most suitable choice.

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  • 19. 

    In an MMA welding process, which of the following statements is false?

    • A.

      An arc gap, which remains almost constant even if as usual the welder varies the position of the electrode

    • B.

      A voltage, which remains almost constant even if as usual the welder, varies the arc gap

    • C.

      A current, which remains almost constant even if as usual the welder, varies the arc gap

    • D.

      A and b

    • E.

      All of the above

    Correct Answer
    D. A and b
    Explanation
    In an MMA welding process, the statement that is false is "An arc gap, which remains almost constant even if as usual the welder varies the position of the electrode." In reality, the arc gap will vary depending on the position of the electrode. The voltage and current, on the other hand, will remain almost constant even if the arc gap is varied by the welder. Therefore, the correct answer is "a and b."

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  • 20. 

    When considering the MIG/MAG welding process which of the following metal transfer modes would be the best suited to the welding of thick plates over 25mm, flat welding position:

    • A.

      Dip transfer

    • B.

      Pulse transfer

    • C.

      Spray transfer

    • D.

      Globular transfer

    Correct Answer
    C. Spray transfer
    Explanation
    Spray transfer is the best suited metal transfer mode for welding thick plates over 25mm in the flat welding position. Spray transfer is characterized by a high current and voltage, which results in a stable and controlled arc. This mode produces a fine, steady stream of small droplets that transfer across the arc to the weld pool. The high energy and velocity of these droplets allow for deep penetration and efficient fusion of the thick plates. Additionally, the spray transfer mode provides good control over the weld pool and minimizes spatter, resulting in high-quality welds.

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  • 21. 

    Which of the following current types would you expect to be used for the welding of aluminium with the TIG welding process?

    • A.

      DC-ve

    • B.

      DC+ve

    • C.

      AC

    • D.

      All of the above

    Correct Answer
    C. AC
    Explanation
    AC (alternating current) is the correct answer for the welding of aluminium with the TIG welding process. TIG welding requires a high-frequency alternating current to generate the heat needed for the welding process. AC current allows for better control of the heat input and helps prevent overheating or distortion of the aluminium material. DC-ve and DC+ve currents are not typically used for TIG welding aluminium as they do not provide the necessary heat control and can result in poor weld quality.

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  • 22. 

    When considering hydrogen,which of the following welding process would produce the lowest levels in the completed weld (under controlled conditions)?

    • A.

      MMA

    • B.

      SAW

    • C.

      TIG

    • D.

      FCAW

    Correct Answer
    C. TIG
    Explanation
    TIG (Tungsten Inert Gas) welding process would produce the lowest levels of hydrogen in the completed weld under controlled conditions. TIG welding uses a non-consumable tungsten electrode to create the arc and a shielding gas, usually argon, to protect the weld area from atmospheric contamination. This process provides excellent control over the welding parameters, resulting in a high-quality weld with minimal hydrogen content. MMA (Manual Metal Arc), SAW (Submerged Arc Welding), and FCAW (Flux-Cored Arc Welding) processes may introduce higher levels of hydrogen due to the presence of flux or consumable electrodes.

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  • 23. 

    Pre heat prior to the welding of a carbon steel but weld:

    • A.

      Must always be carried out

    • B.

      Is always carried out using a gas flame

    • C.

      Need not be carried out if post weld heat treatment is to follow

    • D.

      None of the above

    Correct Answer
    D. None of the above
    Explanation
    Pre-heating prior to the welding of a carbon steel butt weld is not always necessary. The need for pre-heating depends on factors such as the thickness of the material, the welding process being used, and the specific requirements of the welding code or standard being followed. Pre-heating may be required to prevent cracking or improve the weld quality, but it is not always carried out and can be omitted if post-weld heat treatment is planned. Therefore, the correct answer is "None of the above."

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  • 24. 

    In steel the element with the greatest effect on hardness is:

    • A.

      Chromium

    • B.

      Manganese

    • C.

      Carbon

    • D.

      Nickel

    Correct Answer
    C. Carbon
    Explanation
    Carbon is the element with the greatest effect on hardness in steel. This is because carbon can form strong chemical bonds with iron atoms, creating a solid solution called iron carbide or cementite. The presence of carbon in steel increases its hardness by forming a lattice structure that prevents the movement of dislocations, making it more resistant to deformation. Additionally, higher carbon content can also lead to the formation of other hard phases, such as martensite, which further contributes to the overall hardness of the steel.

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  • 25. 

    For a given voltage and current setting on an MMA welding plant, when the arc length is shortened , which of them will be most affected?

    • A.

      The current will increase

    • B.

      The current will decrease

    • C.

      The voltage will decrease

    • D.

      The voltage will increase

    Correct Answer
    C. The voltage will decrease
    Explanation
    When the arc length is shortened in an MMA welding plant, the voltage will decrease. This is because the arc length is inversely proportional to the voltage. When the arc length is reduced, the voltage required to maintain the arc decreases. As a result, the voltage will decrease in order to maintain a stable welding process.

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  • 26. 

    Which of the following best describes a semi-automatic welding process?

    • A.

      The welder is responsible for the maintaining the arc gap and travel speed

    • B.

      The welder is responsible for travel speed only;arc gap is kept constant by the welding plant

    • C.

      Both travel speed and arc gap is controlled by the welding plant

    • D.

      All of above

    Correct Answer
    B. The welder is responsible for travel speed only;arc gap is kept constant by the welding plant
    Explanation
    In a semi-automatic welding process, the welder is responsible for controlling the travel speed of the welding equipment. However, the arc gap, which is the distance between the electrode and the workpiece, is kept constant by the welding plant. This means that the welder does not have to manually adjust the arc gap during the welding process. Therefore, the correct answer is "The welder is responsible for travel speed only; arc gap is kept constant by the welding plant."

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  • 27. 

    What is the purpose of the rectifier in welding sets electrical circuit?

    • A.

      To keep the arc stable when using low current settings

    • B.

      To convert AC current to DC current

    • C.

      To convert DC current to AC current

    • D.

      To initiate arc at start up

    Correct Answer
    B. To convert AC current to DC current
    Explanation
    The purpose of the rectifier in a welding set's electrical circuit is to convert AC (alternating current) to DC (direct current). This is important because welding typically requires a steady and constant flow of current in one direction. By converting AC to DC, the rectifier ensures a consistent and reliable power source for the welding process, allowing for more accurate and controlled welds.

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  • 28. 

    When calibrating a mechanized MAG welding plant, which of the following applies(WFS=wire feed speed)?

    • A.

      Check- WFS,current ,volts and wire diameter

    • B.

      Check- WFS,joint set-up ,gas flow rate and WFS

    • C.

      Check- gas flow rate,stick out length,WFS and current

    • D.

      All of the above

    Correct Answer
    C. Check- gas flow rate,stick out length,WFS and current
    Explanation
    The correct answer is "Check- gas flow rate, stick out length, WFS, and current." When calibrating a mechanized MAG welding plant, it is important to check the gas flow rate to ensure proper shielding gas coverage. Stick out length refers to the length of the electrode extending from the welding torch and should be checked to maintain the correct arc length. Wire feed speed (WFS) is crucial in controlling the deposition rate, and current is adjusted to achieve the desired heat input. Therefore, all of these factors need to be checked during the calibration process.

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  • 29. 

    The main usage of the arc air process is:

    • A.

      The cutting of a weld preparation

    • B.

      The removal of defective weld

    • C.

      For the cutting of non-ferrous materials only

    • D.

      For the cutting of ferrous materials only

    Correct Answer
    B. The removal of defective weld
    Explanation
    The main usage of the arc air process is the removal of defective welds. This process involves using an electric arc to heat and melt the metal, while a high-velocity jet of compressed air blows away the molten metal. This allows for the removal of welds that are deemed defective or need to be repaired. The arc air process is particularly useful in situations where traditional methods of weld removal, such as grinding or cutting, are not feasible or efficient.

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  • 30. 

    Which of the following fillet welded tee joints would have the highest resistance to fatigue fractures, assuming material, welding process, filler material to be the same?

    • A.

      A convex fillet weld throat thickness 8mm

    • B.

      A mitre fillet weld throat thickness 8mm

    • C.

      A concave fillet weld throat thickness 6mm

    • D.

      Both a and b (throat thicknesses dimension the same)

    Correct Answer
    C. A concave fillet weld throat thickness 6mm
    Explanation
    A concave fillet weld with a throat thickness of 6mm would have the highest resistance to fatigue fractures compared to the other options. The concave shape of the weld helps to distribute stress more evenly, reducing the concentration of stress at any particular point. Additionally, the smaller throat thickness of 6mm allows for better penetration and fusion between the base metal and the weld, resulting in a stronger joint.

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  • 31. 

    You notice TIG welding being carried out using MMA electrode striped of flux being used as filler wires .you would certainly report this issue and file a non-conformance report .what would the main reason why?

    • A.

      Because of the additional cost incurred

    • B.

      The wire would have been too thick

    • C.

      Weld metals composition would be incorrect

    • D.

      The welder would not be qualified

    Correct Answer
    C. Weld metals composition would be incorrect
    Explanation
    The main reason for reporting this issue and filing a non-conformance report is that the weld metals composition would be incorrect. TIG welding requires the use of a specific filler wire that matches the composition of the base metal being welded. Using an MMA electrode stripped of flux as filler wire would result in a different composition, leading to an incorrect weld metal composition. This can affect the strength, integrity, and performance of the weld, making it necessary to report and address the issue.

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  • 32. 

    The main reason for grinding the capping passes flush is:

    • A.

      To increase fatigue life

    • B.

      To increase the chances of fatigue cracking

    • C.

      To improve visual appearance

    • D.

      To reduce the components weight

    Correct Answer
    A. To increase fatigue life
    Explanation
    Grinding the capping passes flush helps to increase the fatigue life of the component. This is because any irregularities or roughness on the surface can act as stress concentrators, leading to the initiation and propagation of fatigue cracks. By grinding the capping passes flush, the surface becomes smoother and eliminates these stress concentrators, thereby improving the fatigue life of the component.

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  • 33. 

    Duplex stainless steel can be somtimes referred to as:

    • A.

      Martensitic stainless steel

    • B.

      Ferritic/austenitic stainless steel

    • C.

      316L stainless steel

    • D.

      All of the above

    Correct Answer
    B. Ferritic/austenitic stainless steel
    Explanation
    Duplex stainless steel is a type of stainless steel that contains both ferritic and austenitic microstructures. It combines the strength and corrosion resistance of both ferritic and austenitic stainless steels, making it suitable for applications where high strength and excellent corrosion resistance are required. Therefore, it can be referred to as ferritic/austenitic stainless steel. Martensitic stainless steel refers to a different type of stainless steel that has a martensitic microstructure, and 316L stainless steel is a specific grade of austenitic stainless steel.

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  • 34. 

    Weld centerline longitudinal cracks in welded butt joints may have resulted from which of the following?

    • A.

      Solidification problems

    • B.

      Hydrogen entrapment

    • C.

      Poor welder skill

    • D.

      Both a and b

    Correct Answer
    A. Solidification problems
    Explanation
    Weld centerline longitudinal cracks in welded butt joints may have resulted from solidification problems. When the weld metal solidifies too quickly or unevenly, it can lead to the formation of cracks along the centerline. This can occur due to factors such as high cooling rates, improper weld parameters, or inadequate preheating. Hydrogen entrapment can also contribute to crack formation, but in this case, the cracks are specifically attributed to solidification issues. Poor welder skill may result in various welding defects, but it is not directly related to the formation of centerline longitudinal cracks.

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  • 35. 

    Which of the following would be considered a typical heat input reading with the MIG/MAG welding process?

    • A.

      1.2KJ/mm

    • B.

      12KJ/mm

    • C.

      1.2 Joules /mm

    • D.

      6.5 KJ/mm

    Correct Answer
    A. 1.2KJ/mm
    Explanation
    A typical heat input reading with the MIG/MAG welding process is 1.2KJ/mm. This measurement indicates the amount of energy transferred into the weld per unit length.

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  • 36. 

    During the visual inspection of a fillet weld with even lengths of 15mm.the throat thickness is measured at 8.5mm, what is the fillet welds profile?

    • A.

      Convex

    • B.

      Mitre

    • C.

      Concave

    • D.

      Both a and b

    Correct Answer
    C. Concave
    Explanation
    The fillet weld's profile is concave because the throat thickness (which represents the minimum amount of weld material) is measured at 8.5mm, which is less than the even length of the weld (15mm). In a concave profile, the weld material is not evenly distributed, resulting in a depression or concavity in the weld.

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  • 37. 

    Which of the following welding parameters are the most difficult to control during the welding operation using a manual arc welding process?

    • A.

      Travel speed

    • B.

      Voltage

    • C.

      Current

    • D.

      Arc length

    Correct Answer
    D. Arc length
    Explanation
    Arc length is the most difficult welding parameter to control during manual arc welding. The arc length refers to the distance between the electrode and the workpiece. It directly affects the stability and quality of the weld. If the arc length is too short, it can cause the electrode to stick to the workpiece, resulting in an unstable arc and poor weld quality. On the other hand, if the arc length is too long, it can lead to excessive heat input and potential defects such as porosity or lack of fusion. Therefore, maintaining a consistent and optimal arc length is crucial for achieving a successful weld.

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  • 38. 

    You are the only welding inspection on a cross country gas supply pipeline project .which of the following welding /fabrication stages would you consider the most important stage for your closest scrutiny?

    • A.

      Fit-up and root pass welding

    • B.

      Post weld cleaning

    • C.

      Fillers and capping pass welding

    • D.

      Radiography

    Correct Answer
    A. Fit-up and root pass welding
    Explanation
    The most important stage for close scrutiny would be fit-up and root pass welding. Fit-up ensures that the parts being welded together are properly aligned and positioned, which is crucial for the overall strength and integrity of the weld. Root pass welding is the initial weld that penetrates the base metal, and it is essential to ensure proper fusion and penetration to prevent defects such as lack of fusion or incomplete penetration. By closely inspecting fit-up and root pass welding, the welding inspector can identify and address any issues early on, ensuring the quality and integrity of the weld.

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  • 39. 

    Which of the following us the best way to identify hydrogen controlled electrodes for the MMA welding process?

    • A.

      The colour of the flux covering

    • B.

      The electrodes classification code on box

    • C.

      The electrodes classification code on stamped on to the electrode

    • D.

      The electrode trade/manufacturers name

    • E.

      All of the above

    Correct Answer
    C. The electrodes classification code on stamped on to the electrode
    Explanation
    The best way to identify hydrogen controlled electrodes for the MMA welding process is by looking at the electrodes classification code stamped onto the electrode. This code provides specific information about the type and characteristics of the electrode, including whether it is hydrogen controlled. The colour of the flux covering, the electrodes classification code on the box, and the electrode trade/manufacturers name may also provide some information, but the classification code stamped onto the electrode itself is the most reliable and accurate method of identification.

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Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Apr 02, 2024
    Quiz Edited by
    ProProfs Editorial Team
  • Dec 24, 2012
    Quiz Created by
    Zinmin
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