AME 8 End of Unit – SVE Study

AME 8 End Of Unit Quiz

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

B. A defect where the weld metal forms a series of small, irregular patterns along the weld bead due to inconsistent feed of the electrode.

C. A defect characterized by a rough, uneven surface on the weld bead caused by poor arc stability and improper electrode selection.

A. Small droplets of molten metal that are expelled from the weld pool and land on the surrounding area, often due to excessive heat or improper welding parameters.

D. A defect where the weld metal shows signs of porosity, with visible gas bubbles trapped within the weld bead due to contamination.

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What is the TIG welding process?

A. TIG welding (Tungsten Inert Gas welding) involves using a tungsten electrode to create an electric arc between the electrode and the workpiece, with the weld area protected by an inert gas, usually argon or helium. The process may or may not include a filler rod, which is added separately to the weld pool.

C. TIG welding involves melting the workpiece with a high-powered laser while simultaneously feeding in a solid filler material, with the weld shielded by a nitrogen gas to protect it from contamination.

D. TIG welding utilizes a rotating arc between a copper electrode and the workpiece, with the weld area shielded by a liquid flux, which helps to clean and protect the weld zone during the process.

B. TIG welding uses a consumable electrode that is continuously fed into the weld pool, while the workpiece is shielded by a combination of carbon dioxide and oxygen gases to facilitate the weld.

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What are four conditions necessary for the preparation of steel surfaces prior to painting to ensure a good surface finish?

A. The surface must be clean and free of rust, oil, and grease; properly sanded to remove any old paint; dried completely before application; and primed with an appropriate primer.

C. The steel should be painted immediately after fabrication to avoid exposure; surfaces can remain slightly oily for better adhesion; minimal surface cleaning is required; and only one coat of paint is sufficient.

B. The surface should be slightly roughened using abrasive materials; coated with a layer of protective wax; allowed to remain damp to enhance adhesion; and painted without a primer.

D. The surface must be kept dry and free of any contaminants; painting should be done in high humidity; no primer is needed; and only a single coat of paint is applied.

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

B. A defect where the weld has an uneven surface texture, with areas that are excessively rough or have a spongy appearance due to improper heat settings.

D. A defect where the weld metal has not properly fused with the base metal, resulting in a visible gap or separation between the weld and the surrounding material.

C. A defect characterized by the presence of bubbles or voids within the weld metal caused by trapped gases during the welding process.

A. A defect where the weld metal has formed a concave groove along the edge of the weld, creating a depression that weakens the joint and can lead to crack formation.

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

C. A defect where the weld exhibits a rough, uneven surface due to excessive spatter or contamination during the welding process.

D. A defect where the weld metal forms a series of small cracks or fissures caused by improper cooling or excessive heat.

A. A defect where gas bubbles are trapped within the weld metal, resulting in a porous structure that weakens the weld and may cause a rough surface appearance.

B. A defect characterized by a visible separation or gap between the weld metal and the base metal, indicating poor fusion or incomplete welding.

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

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.

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.

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.

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

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.

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.

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.

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

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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.

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

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

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.

9 / 12

Which welding/brazing/soldering process is best suited for attaching a stainless steel handrail to a steel hull, and why?

B. MIG Welding: Suitable for high-speed welding and can handle different materials but may require careful control of parameters to avoid issues with spatter and heat, which might be less ideal for stainless steel and steel combinations.

C. Brazing: Uses a filler metal with a lower melting point than the base metals, but might not be as strong or durable for critical structural applications like handrails compared to welding.

A. TIG Welding: Provides precise control and produces clean, high-quality welds with minimal spatter, making it ideal for welding stainless steel to steel due to its ability to handle different materials and produce strong, clean joints.

D. Soldering: Utilizes a low-temperature filler metal and is generally not suitable for structural applications like attaching a handrail to a steel hull due to its lower strength and durability.

10 / 12

What are three disadvantages of using aluminum in vessel construction?

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

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

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

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

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Question:

Which welding/brazing/soldering process is best suited for attaching a 1.0 mm steel section to a 10 mm thick deckhead plate, and why?

B. TIG Welding: Offers precise control and high-quality welds but may not be the most efficient for welding thin sections to much thicker plates due to the slower process and potential difficulties with heat management.

C. Brazing: Uses a filler metal with a lower melting point but may not provide sufficient penetration and strength for welding thin sections to much thicker plates, especially in structural applications.

D. Soldering: Employs a low-temperature filler metal, which is not suitable for joining different thicknesses of steel sections due to its insufficient strength and durability for such applications.

A. MIG Welding: Provides a good balance of speed and control, making it suitable for welding thin sections to thicker plates while offering consistent results and effective penetration.

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Why is an explosion-welded joint considered superior to an insulated bolt joint for joining a steel hull to an aluminum superstructure?

C. Explosion welding requires less surface preparation compared to insulated bolt joints, which need extensive surface cleaning and alignment.

D. Explosion welding is more cost-effective and faster than using insulated bolts, which require precise torque settings and additional maintenance.

B. Explosion welding allows for easy disassembly and reassembly, unlike insulated bolt joints which are permanent and difficult to modify.

A. Explosion welding provides a continuous, seamless joint with high strength and minimal thermal distortion, whereas an insulated bolt joint may suffer from mechanical weaknesses and potential galvanic corrosion.

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