​ACFM Equipment Simulated Coating Lift-off Test

ACFM Equipment Simulated Coating Lift-off Test

Test Overview

To verify the lift-off capability of TESTLEE ACFM equipment and confirm its detection performanceunder different coating thicknesses,

this lift-off capability test is conducted to ensure the applicability and reliability of the equipment in practical engineering inspection.

In this test, acrylic plates of varying thicknesses are used to simulate actual coatings.

By gradually adjusting the lift-off thickness, scanning data and detection results are recorded to analyze the operating status of

theequipment at different lift-off distances, providing data support and technical reference for practical field application.

Test Equipment and Materials

• Main Test Equipment

        • Equipment Name：ACFM Detector

          • Manufacturer：TESTLEE

          • Equipment Model：YTACFM-X1PROEP

          • Probe Model：YTACFM-02

          • Equipment Status：In normal operation and compliant with inspection requirements after calibration.

• Auxiliary Test Supplies

          • Simulated Coating Test Plate: Acrylic (uniform texture, intact and free of impurities).

          • Thickness Specification: 0mm、1mm、1.5mm、2.5mm、3mm、4mm、5mm、7mm、9mm.

          • Test Block: Standard test block with defect-free surface, dimensions conforming to equipment scanning

requirements,used to place simulated coatings and complete scanning tests.

Simulated Coating Test Plate

• Test Block

Test Block and Defect Information

• Test Environmental Conditions

    • Ambient Temperature: 20℃±5℃

    • Ambient Humidity：45%±10%RH

    • Power Supply Conditions：220V±10V，50Hz，Stable power supply without voltage fluctuation.

    • Test Site：No electromagnetic interference, no vibration, flat site for stable equipment placement.

Test Records and Results

• Lift-off Thickness Setting

This test uses acrylic plates to simulate coatings, with 9 different lift-off thicknesses set as follows:

0mm (no acrylic plate, probe directly contacts test block surface), 1mm, 1.5mm, 2.5mm, 3mm, 4mm, 5mm, 7mm and 9mm. Verify the actual thickness of acrylic plates before each test to guarantee accurate lift-off values.

This test conducts simulated lift-off scanning on defects in the weld heat affected zone. Due to weld height difference,

the simulated coating plates cannot fully attach to the defect surface, so the actual lift-off height is higher than the recorded value.

Simulated Scanning at Various Lift-off Thicknesses:

• Scanning Images and Results of Each Lift-off Thickness:

The scanning images of each lift-off thickness clearly show the scanning area and signal distribution. Key information such as signal

intensity and data stability shall be recorded in the scanning results, as detailed below:

• Lift-off Thickness 0mm (No Acrylic Plate) Scanning

Scanning Status: The equipment runs steadily with clear scanning signals and undistorted data. The voltage scale is set to 2.5V.

Scanning Image:

• Lift-off Thickness 1mm Scanning

Scanning Status: The equipment operates stably with distinct scanning signals and intact data. Voltage scale is set to 2.5V.

Scanning Image:

• Lift-off Thickness 1.5mm Scanning

Scanning Status: The equipment runs steadily with clear scanning signals and undistorted data. The voltage scale is set to 2.5V.

Scanning Image:

• Lift-off Thickness 2.5mm Scanning

Scanning Status: The equipment runs steadily with clear scanning signals and undistorted data. The voltage scale is set to 2.5V.

Scanning Image:

• Lift-off Thickness 3mm Scanning

Scanning Status: The equipment runs steadily with clear scanning signals and undistorted data. The voltage scale is set to 2.5V.

Scanning Image:

• Lift-off Thickness 4mm Scanning

Scanning Status:The equipment runs steadily with clear scanning signals and undistorted data. The voltage scale is set to 2.5V.

Scanning Image:

• Lift-off Thickness 5mm Scanning

Scanning Status: The equipment runs stably with clear scanning signals and undistorted data. (Voltage scale set to 1.0V)

Defect signals are obvious. To enhance the display clarity of defect signals, it is recommended to adjust the voltage scale to 1.0V.

Scanning Image:

• Lift-off Thickness 7mm Scanning

Scanning Status: The equipment runs stably with clear scanning signals and undistorted data. Noise signals are visible, and it is

recommended to adjust the voltage scale to 1.0V.

Scanning Image:

• Lift-off Thickness 9mm Scanning

Scanning Status: The equipment runs stably with clear scanning signals. Distorted data and obvious noise signals are observed.

It is recommended to adjust the voltage scale to 0.5V.

Scanning Image:

Test Summary

It is concluded from the scanning test results that the lift-off scanning performance of nine simulated coating tests with lift-off thicknesses

of 0mm, 1mm, 1.5mm, 2.5mm, 3mm, 4mm, 5mm, 7mm and 9mm is as follows:

• Scanning without simulated coating (0mm lift-off): The equipment operates normally with clear scanning signals and undistorted data.

  Defect signals can be easily identified when the voltage scale is set to 2.5V.

• Under simulated coating lift-off thicknesses of 1mm to 4mm, the equipment runs normally with clear scanning signals and

  undistorted data. Setting the voltage scale to 2.5V can meet the testing requirements.

• At the simulated coating lift-off thickness of 5mm, the equipment works normally with clear scanning signals and undistorted data.

  Adjusting the voltage scale to 1.0V enables clearer display of defect signals.

• At the simulated coating lift-off thickness of 7mm, the equipment runs normally.Slight noise signals emerge in scanning results.

  Adjusting the voltage scale to 1.0V ensures effective identification of defect signals.

• At the simulated coating lift-off thickness of 9mm, the equipment operates normally with prominent noise signals and slight data

  distortion. Adjusting the voltage scale to 0.5V can still assist in defect signal identification.

Conclusion:

The equipment maintains stable operation within the lift-off thickness range of 0mm to 9mm.Excellent detection performance is achieved

at 0-4mm lift-off, and setting the voltage scale to 2.5V fully meets actual detection demands. With the increase of lift-off thickness, noise

interference gradually rises and partial data gets slightly distorted. Appropriately reducing the voltage scale can effectively optimize signal

display. Defect signals can still be accurately identified even at the maximum 9mm lift-off thickness. The equipment is applicable to flaw

detection of workpieces with coating layers.

This test fully verifies the lift-off performance and operational reliability of the YTACFM-X1PROEP ACFM instrument, clarifies its matching

parameters and detection performance under different lift-off thicknesses.It is confirmed that the instrument can meet the defect detection

requirements under conventional coating thickness conditions. Especially for defect scanning in weld heat affected zones, effective detection signals can be stably acquired even when the actual lift-off height rises due to weld height, delivering excellent adaptability for practical

engineering applications. All test data and scanning images are authentic and traceable, providing reliable references for subsequent popularization, application and parameter optimization of the equipment.