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Guidelines for Effective Repair and Quality Assurance in Engineering

Understand the need for repair in engineering with quality assurance standards. Learn about repair classifications, MRB involvement, and composite repair types and materials. Discover advantages of wet and prepreg systems for composite repairs, and follow the general repair procedures for successful outcomes.

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Guidelines for Effective Repair and Quality Assurance in Engineering

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  1. Repair

  2. WHEN IS REPAIR NECESSARY? • Quality Assurance applies acceptance criteria during in-process inspection, final inspection, and/or field inspection → part may be discrepant (defective) and rejected • Discrepancy report (DR) written

  3. QUALITY ASSURANCE/ENGINEERING HAS TO CLASSIFY REPAIR REQUIRED • apply judgment • may be explicitly stated in repair criteria guideline (General Repair Specification) • repair classifications • rework • standard repair • Material Review Board (MRB) - members include Quality Assurance and Engineering

  4. EXAMPLE OF GENERAL REPAIR SPECIFICATION • Class IV - cosmetic, negligible repair - rework - non-structural repairs to bring part up to required drawing finish • Class III - minor structural repair - standard repair procedure applicable • Class II - major structural repair - standard repair procedure applicable • Class I - major structural repair - requires MRB review

  5. TYPES OF COMPOSITE REPAIRS • bolt on repair • filling • resin/adhesive/syntactic foam/composite • removing/filling • scarf repair (50:1 if possible)

  6. REPAIR MATERIALS • resins/adhesives • viscosity • cure time and temperature • syntactic foam/foaming adhesives • reinforcing fabric, milled fibers • preimpregnated fabric and tape

  7. WET SYSTEM ADVANTAGES • room temperature cure • can use minimal process materials and equipment

  8. PREPREG SYSTEM (HOT BONDERS) ADVANTAGES • resin content control • cleaner system to work with • may provide better match with existing material • Wichitech Composite Repair Systems

  9. REPAIR PROCEDURES • in general, these four steps are followed • surface preparation • application of material • cure: time, temperature, and pressure • finishing

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