AME 8 End of Unit – SVE Study

AME 8 End Of Unit Quiz

1 / 12

Why is AC current preferred for TIG welding of aluminum?

B. AC current provides a more stable arc compared to DC current, reducing the risk of contamination and improving the overall efficiency of the welding process.

A. AC current helps to clean the aluminum surface by alternating between positive and negative polarities, which removes oxides and improves the weld quality.

D. AC current is more efficient at penetrating thick aluminum sections, making it suitable for welding heavy-duty aluminum components.

C. AC current is less prone to causing warping and distortion of the aluminum workpiece due to its lower heat input compared to DC current.

2 / 12

Why is it not normal practice to join aluminum superstructures to a steel hull using conventional welding techniques?

A. Conventional welding techniques cannot effectively join aluminum and steel due to differences in melting points, which can lead to weak joints and potential structural failures.

D. Conventional welding techniques result in high levels of toxic fumes, making the process unsafe for the workers.

B. Conventional welding techniques are too expensive and time-consuming for joining aluminum to steel and require special equipment.

C. Aluminum and steel welds produce excessive heat, causing warping and distortion, which affects the structural integrity of the vessel.

3 / 12

What is the process of oxy-acetylene welding?

C. Oxy-acetylene welding is done by applying a heated iron electrode to the metal surfaces to weld them together.

A. Oxy-acetylene welding involves the use of a high-frequency electric arc to melt and join metal surfaces.

D. Oxy-acetylene welding employs a laser beam to focus intense heat on metal surfaces to achieve fusion.

B. Oxy-acetylene welding uses a mixture of oxygen and acetylene gases to produce a high-temperature flame that melts the metal surfaces, allowing them to fuse together.

4 / 12

What is lack of fusion in a weld produced using the covered electrode welding process?

A. A defect where there is inadequate bonding between the weld metal and the base metal, or between adjacent weld passes, resulting in a gap or separation that weakens the weld.

D. A defect involving visible fissures or separations in the weld metal, often caused by rapid cooling or high stresses.

C. A defect where non-metallic materials, such as slag or oxide, are trapped within the weld metal, compromising the weld's strength and integrity.

B. A defect characterized by trapped gas bubbles within the weld metal, which leads to a porous structure and rough surface appearance.

5 / 12

What are the advantages of TIG welding compared to other welding methods?

A. TIG welding provides high-quality welds with precise control over the heat and filler material, making it ideal for welding thin materials and producing aesthetically pleasing welds.

B. TIG welding is faster than other welding methods and does not require any post-weld cleaning or finishing work, reducing overall labor time.

D. TIG welding uses a wide range of filler materials, including plastic and ceramic, which makes it versatile for various applications.

C. TIG welding is less expensive than methods like MIG or stick welding, making it a cost-effective choice for large-scale production.

6 / 12

What surface preparation is required for gas metal arc welding (MIG) of mild steel, and why?

C. The surface should be coated with a thin layer of protective wax to prevent oxidation during welding.

A. The surface should be clean and free of rust, paint, oil, and other contaminants to ensure proper electrical contact and strong welds.

D. The surface should be slightly heated to improve the flow of the molten metal and enhance weld strength.

B. The surface should be roughened using abrasive tools to increase adhesion, as MIG welding does not require a clean surface.

7 / 12

What is a crater defect in a weld produced using the covered electrode welding process?

B. A defect characterized by a series of small, raised areas along the weld bead caused by excessive heat or incorrect electrode angle during welding.

A. A defect where a small, deep depression forms at the end of the weld bead due to improper stopping of the welding arc, leading to a weakened area that can be prone to cracking.

C. A defect where the weld metal has not properly fused with the base metal, resulting in a visible gap or separation along the weld joint.

D. A defect where the weld exhibits a rough, uneven surface texture due to contamination or inconsistent electrode feed during the welding process.

8 / 12

Which welding/brazing/soldering process is best suited for re-attaching a section of a broken flange on a cast iron pump casing, and why?

D. Soldering: Employs a low-temperature filler metal, which is not suitable for high-strength or high-temperature applications such as re-attaching a broken flange on a cast iron pump casing.

A. Brazing: Utilizes a filler metal with a lower melting point than the base metal, which can effectively join cast iron without the need for high temperatures that could cause further damage to the pump casing.

B. TIG Welding: Provides high precision and control but may not be ideal for cast iron due to the high temperatures involved, which could lead to further cracking or thermal stress in the cast iron.

C. MIG Welding: Typically used for thinner materials and may not be suitable for cast iron due to potential difficulties in managing heat and avoiding cracks.

9 / 12

What maintenance should be carried out to ensure the continued structural integrity of a vessel with an aluminum superstructure attached to a steel hull?

B. Frequent repainting of the aluminum superstructure only, ensuring that the steel hull is left uncoated to maintain natural corrosion resistance.

C. Routine checks for structural damage to the aluminum superstructure, replacing all steel components every few years, and avoiding any contact with seawater.

D. Continuous monitoring of temperature changes, ensuring that the aluminum superstructure is always kept at a specific temperature range to avoid expansion issues.

A. Regular inspection and cleaning of joints to prevent galvanic corrosion, application of protective coatings to both aluminum and steel surfaces, and periodic replacement of anodes if used for cathodic protection.

10 / 12

What are three disadvantages of using aluminum in vessel construction?

D. Limited availability, higher maintenance requirements, and reduced fatigue resistance compared to other metals.

A. Limited resistance to saltwater corrosion, higher material cost, and lower structural strength compared to steel.

B. Greater weight than steel, poor weldability, and susceptibility to high temperatures.

C. Reduced impact resistance, high thermal expansion, and complex recycling process.

11 / 12

What are inclusions in a weld produced using the covered electrode welding process?

C. Defects where there is a visible gap or separation between the weld metal and the base metal, indicating poor fusion or incomplete penetration.

B. Defects characterized by visible gas bubbles within the weld metal, resulting in a porous structure and rough surface appearance.

A. Defects where non-metallic materials, such as slag or oxide, are trapped within the weld metal, leading to weakened weld strength and potential for failure.

D. Defects where the weld metal exhibits excessive spatter, causing irregular droplets of metal around the weld area.

12 / 12

What is an overlap defect in a weld produced using the covered electrode welding process?

C. A defect where the weld exhibits visible cracks or fractures caused by excessive cooling rates or improper weld parameters during the process.

D. A defect where the weld metal has formed a rough, porous surface due to contamination or incorrect electrode selection, leading to weak weld integrity.

B. A defect characterized by an irregular weld bead pattern due to inconsistent feed of the electrode or uneven heat distribution, resulting in an aesthetically unpleasing appearance.

A. A defect where the weld metal extends over the edge of the base metal without proper fusion, creating a pronounced ridge or lip that weakens the joint and can affect its strength.

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