Etch Inspection Training Course Syllabus

Etch Inspection Training Course Syllabus - Level II

The level II Syllabus will include all of the items covered by Level I Syllabus together with the following items

1. SURFACE CONDITIONS WHICH CAN BE DETECTED BY ETCH INSPECTION – THEIR CAUSE, ELIMINATION AND METALLURGY
Metallurgical principles underlying the various surface conditions, re-hardening, re-solution treatment, re-tempering and over-ageing. Over ageing of the surface during machining grinding lapping or honing.
Non-uniform properties on through and surface hardened components prior to and after machining operations. Localized carburizing and de-carburizing and nitrided white layer. Effects attributable to plating and Magnetic Particle operations. Basic good machine shop practice

2. INSPECTION AND ASSESSMENT OF ETCH INDICATIONS
Recommended conditions for inspection light levels, methods of illumination and the use of viewing aids. Recognition of correctly etched surface. Appearance of unacceptable surface indications. False indications ,their causes and corrective actions. Component configurations subject to unacceptable conditions. Interpretation of the significance of indications.

3. CORRECTIVE ACTIONS AND THEIR LIMITATIONS.
Removal of indications by further machining grinding etc. The removal of indications by further heat treatment. Use of controlled blasting or peening techniques – fatigue performance. Approval of corrective actions. Re-etching to confirm removal of indications
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4. SPECIFICATIONS, STANDARDS AND CODES OF PRACTICE
Review of Codes Standards and Specifications of the main Aerospace manufacturers

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