GB/T 23601-2009Method of eddy current testing for titanium and titanium alloy bars and wires (English PDF)

2.1 Objective

This method is mainly used to detect titanium and titanium alloy bar, wire products of surface and near surface defects, such as dents, cracks, and other exposure or

Exposed to the tissue surface discontinuities on.

2.2 staff

Operators should reach the ministerial or equivalent level and above grade I learn NDT personnel level, the issue of inspection reports and explain people

Members should meet ministerial or equivalent level learn grade II level and staff.

2.3 size and appearance quality

2.3.1

wire rod surface should be clean, can not affect the presence of test dirt, grease, metal shavings and other foreign substances.

Curvature 2.3.2 wire rods, the surface roughness and size tolerances shall comply with relevant product standards.

3.1 eddy current flaw detector

3.1.1

eddy current flaw detector operating frequency range is generally 10kHz ~ 100kHz.

3.1.2

The instrument should include incentives, receives, amplifies and phase adjustment, filtering unit, and an alarm, display or recording device.

3.2 detection coil

3.2.1

and eddy current flaw detection coil combination can generate the induced current in the rods, wire surface or near-surface, and can detect rods, electrical wire

Changes in magnetic properties.

3.2.2

In ensuring rods, wire passed the detection coil does not scratch the rod, wire surface of the premise, as far as possible the use of encircling coil detector

Choose a high fill factor of the detection coil, usually not less than 0.7.

3.3 gearing

3.3.1

make wire rods evenly and smoothly through the coil, without causing damage to the surface of the wire rod.

3.3.2

have to ensure that the detection coils or scanning center of the track with the test rods, wire center line of the adjustment mechanism.

3.3.3 rods, wire feed speed of 5m/min ~ 80m/min

Change the selected speed should not exceed ± 10%.

3.4 sorter

We can distinguish between the Qualified or unqualified rods, wire, and its sorting.

Comparative Sample 4 4.1 Comparative Sample having artificial groove for adjusting the sensitivity performance testing, calibration and testing equipment as product acceptance criteria

The rod-like.

4.2

should be used in comparative sample was seized rods, wire material, geometry, uniform surface state and heat treatment process, and does not affect manual

Stick standard defect identification signal, wire preparation.

4.3

Comparative Sample optional V-shaped or U-shaped, rectangular groove. The comparative sample shall be at least three weeks to 120 ° spacing of the same size

Person-notch defects and artificial defects longitudinal groove uniform intervals of not less than 100mm.