Questions and Answers
Which tool is primarily used in ultrasonic inspection?
What is the first step when addressing holes in a weld?
Which dimensional inspection tool is best for measuring the internal features of a cylindrical workpiece?
Under which condition will a part be identified as having a fatigue crack during magnetic particle inspection?
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Which measuring tool is commonly used to measure the alignment of a rotor shaft?
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Which nondestructive testing method uses the principle of electromagnetic induction?
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What action should be taken if a weld exhibits projecting globules?
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Which tool is best for calibrating a micrometer for accuracy?
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What is the most commonly used method of magnetic particle inspection for detecting invisible cracks in aircraft parts?
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Which of the following is NOT an acceptable defect related to metal lines?
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Which indicating mediums are available for magnetic particle inspection?
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If dye penetrant inspection results are unclear, what is a likely cause?
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Which aluminum alloy designation indicates that the metal has received no hardening or tempering treatment?
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What method involves measuring the size of oval wear holes using a specific tool?
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What is the purpose of using a micrometer reading in inspections?
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Which heat-treating process produces a hard, wear-resistant surface over a tough core?
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Which nondestructive testing method is typically used to evaluate the soundness of a repair after it has cured?
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What should be the height of the weld bead above the base metal?
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Which tool is specifically designed to measure the clearance between a surface plate and a narrow surface being checked for flatness?
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To check the twist of a connecting rod, which method is typically employed using push-fit arbors?
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What type of aluminum alloy is the core material of Alclad 2024-T4?
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Which method is suitable for detecting defects that are open to the surface in aluminum forgings and castings?
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Which defects can be detected by magnetizing a part with continuous longitudinal magnetization using a cable?
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Which tool would be most appropriate for measuring the stretch of a stem on a poppet-type valve?
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Study Notes
Welding and Repair Techniques
- Penetration depth for repairs must ensure fusion of the filler rod in the potted compound technique.
- Weld bead height should be maintained at 1/8 inch above the base metal for quality repairs.
- Smooth tapering of the weld into the base metal is critical for structural integrity.
Nondestructive Testing Methods
- Common methods for testing repair soundness post-curing include:
- Eddy current test
- Metallic ring test
- Ultrasonic test
Measurement and Inspection Tools
- The twist of connecting rods is measured using push-fit arbors and parallel bars, with measurements taken between the arbor and bar.
- Dial indicators, height gauges, and thickness gauges are utilized to assess flatness and component dimensions.
- Dial gauges are effective for measuring clearance or roundness in components.
Aluminum Alloys
- Alclad 2024-T4 core consists of heat-treated aluminum alloy and is coated with commercially pure aluminum.
- Designations like 3003-F and 5052-H36 indicate no hardening or tempering treatment has occurred.
Defect Detection
- The continuous method of magnetic particle inspection is often used to detect invisible cracks in aircraft components.
- Magnetization reveals defects based on their orientation:
- Perpendicular defects align with the part's axis.
- Defects parallel to concentric circles indicate internal inconsistencies.
Inspection Techniques
- Methods to detect surface cracks in aluminum may include:
- Dye penetrant inspection
- Magnetic particle inspection
- Indicators of improper dye penetrant results include unclear indications due to inadequate degaussing or washing.
Heat Treatment Processes
- Case hardening is a process that creates a hard, wear-resistant surface on metal, while maintaining a strong core.
- Heat treating broadly applies to both aluminum and iron-base metals.
Calibration and Alignment
- Calibrating a micrometer typically involves using a gauge block.
- Alignment of rotor shafts or disk rotation planes can be measured with a dial indicator, shaft gauge, or protractor.
Weld Defects and Actions
- Presence of defects such as holes in a weld necessitates actions ranging from rewelding to full removal and re-welding of the joint.
- Fatigue cracks identified via magnetic particle inspection may display specific discontinuity patterns, signaling structural concerns.
Bolt and Component Fastening
- Proper alignment of cotter pin holes in aircraft bolts and nuts is essential for safe fastening within the recommended torque range.
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Description
Test your knowledge on welding repair techniques, focusing on the potted compound repair method. This quiz covers the necessary penetration depth, weld bead height, and the nondestructive testing methods used to assess weld soundness after curing.
