Magnetic Particle Test Bar 

MPI Test Bar 

The MPI Test Bar is a standardized test piece conforming to the requirements of NAVSEA T9074-AS-GIB-010/271 to demonstrate magnetic particle equipment performance. The MPI Test Bar can be used with wet bench equipment, power packs, or magnetic yokes. The test bar includes both surface and sub-surface flaws for use with AC, HWDC, and FWDC magnetizing currents. Surface notches in two directions on each side of the bar are used to confirm both circular and longitudinal AC magnetization. Multiple subsurface defects at progressive depths provide confirmation of HWDC and FWDC field penetration. All machined flaws are epoxy filled to prevent magnetic particles from becoming trapped within the test bar.

Features 

• Dimensions 10.0 in x 1.25 in x 0.375 in
• Surface flaws (L x W x D)
• Top Side Lengthwise (2.0 in x 0.005 in x 0.040 in);

                          Transverse (0.063 in x 0.005 in x 0.020 in)

• Bottom Side Lengthwise (0.062 in x 0.005 in x 0.020 in) 

                          Transverse (1.25 in x 0.005 in x 0.020 in)

• Subsurface flaws – Transverse: 0.064 in dia x 0.75 in deep holes

1. 0.051 in from surface

2. 0.061 in from surface

3. 0.071 in from surface

4. 0.081 in from surface

5. 0.091 in from surface

6. 0.131in from surface

• Lengthwise 0.064 in dia x 1.75 in deep hole

                            0.093 in from surface

Applications 

Position test bar in magnetising equipment

• Wet bench equipment: Clamp bar between head and tail stock
• Power pack equipment: Use contact clamps to attach cables to test bar or place test bar inside cable wrap coil.

Magnetise test bar according to table below. Apply particles to form indications. AC fields will detect surface flaws. HWDC and FWDC fields will detect subsurface flaws.

For yoke magnetisation, position yoke legs on either end of the test bar. Magnetise and apply particles to form transverse indications.

Ordering Information 

Magnetic Particle Test Bar (MIL STD): 189838 Contains coarse and fine surface and subsurface defects in both directions. Meets or exceeds most industrial and military standards for artificial test specimens and complies with MIL-STD-271.

Product Properties 

NDT Type: Fluorescent Magnetic Particle Testing, Visible Magnetic Particle Testing

Compliance 

Standards: NAVSEA T9074-AS-GIB-010/271, ASME BPVC Section V Article 7, ASTM E709, ASTM E1444, ASTM E3024