Free CCT Repair Techniques & Quality Control Questions and Answers

Question 1

What is the recommended method to prepare a damaged composite surface for repair?

Accepted Answer

Sanding and cleaning

Answer

Proper surface preparation is critical for a successful composite repair. Sanding removes any damaged material, old coatings, and creates a roughened surface profile that promotes good mechanical adhesion for the new repair materials. Following sanding, thorough cleaning removes dust, oils, and contaminants, ensuring a clean, bondable surface for optimal repair strength and longevity.

Question 2

Which type of resin is commonly used in composite repairs?

Accepted Answer

Epoxy resin

Answer

Epoxy resin is widely favored for composite repairs due to its excellent adhesive properties, high strength, low shrinkage during curing, and good chemical resistance. It forms strong bonds with various reinforcement fibers and substrates, making it ideal for restoring the structural integrity of damaged composite components. Its versatility and performance make it a go-to choice for professional repairs.

Question 3

What is the purpose of post-curing a composite repair?

Accepted Answer

Improves mechanical strength

Answer

Post-curing involves exposing a composite repair to elevated temperatures for a specific duration after the initial cure. This process further cross-links the polymer matrix, significantly enhancing the material's mechanical properties such as strength, stiffness, and heat resistance. It ensures the repair achieves its full design performance and durability.

Question 4

Which equipment is used to check repair thickness?

Accepted Answer

Ultrasonic thickness gauge

Answer

An ultrasonic thickness gauge uses sound waves to measure the thickness of a material from one side. It transmits an ultrasonic pulse into the material and calculates the thickness based on the time it takes for the pulse to reflect back from the opposite surface. This non-destructive method provides highly accurate measurements for checking composite repair thickness against specifications.

Question 5

What quality control technique checks for surface defects?

Accepted Answer

Visual inspection

Answer

Visual inspection is a fundamental quality control technique that relies on the human eye, often aided by magnification or specialized lighting, to detect surface defects. It can quickly identify issues such as cracks, scratches, delaminations, porosity, or improper finish on the surface of composite materials. This method is cost-effective and typically the first step in assessing material quality.

CCT - Certified Composite Technician Practice Test

CCT - Certified Composite Technician Practice Test

Free CCT Repair Techniques & Quality Control Questions and Answers