Reference Blocks (2)

Question 1

What do Calibration Blocks do?

Answer 1

Insure reproducibility of results
They are controlled:
- Flaw free (except reference flaws)
- Grain size
- Attenuation
- Heat-treatment

Question 2

IIW Block (International Institute of Welding)

Answer 2

Two versions
- has a 25mm (1in) radius
- a square notch
both can be found in metric or imperial dimensions

Question 3

What does the IIW Block do?

Answer 3

• Calibrate the time base
• Verify linearity of instrument
• Find index point + probe angle
• Verify resolution
• Set sensitivity

Question 4

ASTM E127 (Alcoa) Blocks

Answer 4

Two types:
- Area Amplitude Series (Same height, diameter of FBH changes)
- Distance Amplitude Series (Different height, same FBH diameter)
Both are made of Aluminium, are 2in in diameter, FBH is drilled 3/4” from bottom.

Question 5

Identification numbers on ASTM Blocks

Answer 5

0000-0-0000
1st number- material block is made of
2nd number- diameter of the hole (in 64th of an in)
3rd number- distance from top surface to top of FBH (in)

Question 6

Mini IIW Block

Answer 6

Height and radius of 2in/50mm

- used to calibrate time base

Question 7

DSC

Answer 7

Small field block

• calibrate time base
• set sensitivity
• shaped like two curvy mountains

Question 8

DC

Answer 8

Small field block

• calibrate time base
• shaped like half of a tiered circular cake

Question 9

SC

Answer 9

Small field Block

• calibrate time base
• set sensitivity
• shaped like a rectangle

Question 10

Miniture angle beam/Kidney/Rompus Block

Answer 10

Small field block

• calibrate time base
• shaped like a curved mountain

Question 11

Stepwedge

Answer 11

Used for thickness measurements on thin materials

- 4/5 steps

Question 12

Curved Stepwedge

Answer 12

Used for thickness measurements on thin curved materials

• 4/5 steps
• must be re-calibrated once a year

Question 13

ASME Block

Answer 13

Draw Distance Amplitude Correction (DAC) curves when inspecting components under the ASME code.

• for thicknesses of 1-2in
• different thickness and curvature to match different components