Reference and Calibration Standards (4)

Question 1

Types of Reference & Calibration standards in ET:

Answer 1

• conductivity samples (material sorting)
• non-conductive coating samples (paint thickness checks)
• Artificial EDM saw cuts and drilled holes (crack detection & corrosion pitting)

Question 2

calibration blocks are composed of a wide range of _____ _____ materials.

Answer 2

electrically conductive materials.

Question 3

We calibrate ET instruments for:

Answer 3

• material sorting
• hardness tests
• heat treatment test
• over heat tests

Question 4

What are Groove and Flat Bottom Hole Tube Standards?

Answer 4

tube standards made of thin walled tubing of various materials representative of the tubes used in the heat exchanger industry.

• machined inside & outside grooves to represent stress and fatigue corrosion cracking
• machined fbh of various depths represent exterior corrosion

Question 5

What are Groove and Flat Bottom Hole Tube Standards used for?

Answer 5

encircling and bobbin probes can be calibrated using these standards prior to an actual inspection.
- similar to a calibration block but for tubing

Question 6

What are Wear Scar and Wall Thinning Standards?

Answer 6

• tube standard

- calibrate ID bobbin probes to detect shallow exterior wall loss

Question 7

What is the Multi Purpose Aircraft Standard?

Answer 7

calibrate probes for:

• surface/near surface crack detection on: flat surfaces, radius surfaces and around fasteners
• surface crack detection on interior curved surfaces of bore holes
• subsurface cracks in multilayer plate kin
• material conductivity testing

Question 8

What are Non-Conductive Coating Thickness Lift Off Standards?

Answer 8

• calibrate surface probes to determine thickness of non-conductive coatings
  i. e. paint, plastic wrap covering metal surfaces