bonded structures repairer Interview Questions and Answers

1. What is your experience with different types of adhesives used in bonded structure repair?

   • Answer: I have extensive experience with epoxy adhesives, cyanoacrylates, polyurethane adhesives, and acrylic adhesives. I understand the strengths and weaknesses of each, including their cure times, shear strength, temperature resistance, and suitability for various substrates. I am also familiar with selecting the appropriate adhesive based on the specific repair needs and environmental conditions.

2. Describe your process for preparing a surface for bonding.

   • Answer: Surface preparation is critical. My process begins with thorough cleaning to remove dirt, grease, oil, and any previous coatings. This usually involves degreasing solvents, abrasive blasting (if necessary), and sometimes chemical etching. Then, I assess the surface profile to ensure adequate mechanical interlocking for the adhesive. This may involve creating a rough surface using appropriate techniques like sandblasting or using specialized surface preparation tools. Finally, I ensure the surface is completely dry before applying the adhesive.

3. How do you ensure the proper mixing ratio of a two-part adhesive?

   • Answer: I always carefully follow the manufacturer's instructions for mixing ratios. This often involves using a calibrated dispensing system or precisely measuring the components using a scale or graduated cylinders. Thorough mixing is crucial to ensure proper curing and bond strength. I use a clean mixing stick and ensure I scrape the sides and bottom of the container to avoid any unmixed components.

4. What safety precautions do you take when working with adhesives and solvents?

   • Answer: Safety is paramount. I always wear appropriate personal protective equipment (PPE), including gloves, eye protection, and respiratory protection, as required by the specific adhesive and solvent Safety Data Sheets (SDS). I work in well-ventilated areas, or use respirators in confined spaces. I properly dispose of waste materials according to regulations and store chemicals safely.

5. Explain the process of inspecting a bonded repair.

   • Answer: Inspection involves visual checks for any voids, gaps, or imperfections in the bond line. I might use non-destructive testing methods like ultrasonic testing or dye penetrant inspection to detect internal flaws. I also assess the cured adhesive's appearance to ensure it conforms to the manufacturer's specifications. Documentation of the inspection process is crucial, along with recording any findings.

6. How do you handle a bonded repair that fails?

   • Answer: Failure analysis is key. I would first determine the cause of failure – was it improper surface preparation, incorrect adhesive selection, mixing issues, or environmental factors? Once the root cause is identified, I would carefully remove the failed repair, correct the underlying issues, and then re-apply the adhesive using the corrected process. Documentation of the failure and corrective actions is critical.

7. What is your experience with different types of bonded structures?

   • Answer: I have worked on a variety of bonded structures, including composite structures (carbon fiber, fiberglass), metallic structures (aluminum, steel), and hybrid structures combining different materials. My experience includes repairing aircraft components, automotive parts, and industrial equipment.

8. How do you determine the appropriate cure time for an adhesive?

   • Answer: I always consult the manufacturer's specifications for the adhesive being used. The cure time depends on factors such as temperature, humidity, and the type of adhesive. I may also use a curing schedule or monitor the cure using a curing meter to ensure the bond achieves the required strength.

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