Q NET Engineering GmbH

Hardness Depth Tester P3123



Induction Hardening improves the wear resistance and the fatigue limit of dynamically stressed parts. These mechanical properties are primarily determined by the Surface Hardness, the Hardening Depth and the Residual Stress Depth Profile. The Surface Hardening Depth (SHD) - or the thickness of the hardened layer - is essential for the quality of the induction hardening process. Up to now, random samples using destructive methods were the only way to control the quality of hardening processes. Needless to say, the method was very costly and time-consuming.


In collaboration with the Fraunhofer Institute for Non-Destructive Testing (IZFP), Q NET has developed an ultrasonic method for fast and non-destructive SHD testing. We reduce the effort and the costs of testing and provide fast production control to ensure consistently high quality levels. The test instrument is used for optimizing production parameters, reducing downtime after inductor changes, for fast production control and for quality management.

Correlation between destructive and non-destructive test

Inspection Technique

The inspection technique called "Ultrasonic Backscattering Technique" (UBT) is based on the effect that the hardened layer is almost transparent to the ultrasonic waves while the non-hardened material scatters them back. The backscattering signal is received by the testing probe system, it is processed with IZFP testing electronics and is evaluated in a fully automated way. The results that are shown indicate the depth of the hardened material (SHD). Comparisons show that the results very much comply with the results of traditional destructive methods. The method is suited for testing SHD of > 1.2 mm using standard probe systems.

Principle of the Ultrasonic Backscattering Technique

Tester P3123


  1. Extremly robust for industrial evironment,
  2. testing of complex geometries,
  3. high inspection precision,
  4. line and circumferential scans,
  5. display of exact testing point,
  6. inspection takes only seconds,
  7. fast inspection of large quantities,
  8. test instrument can be integrated into the production process,
  9. with adequate sensor adjustment also radiuses can be inspected,
  10. test instrument is portable and suitable for mobile use,
  11. test instrument is easy to adjust to the customer's needs.

Software SHD Studio
Inspection Software "SHD Studio"


  1. Ruggedized notebook for industrial use,
  2. 4 UT channels,
  3. multiparameter sensor technology,
  4. test frequency: 5-30 MHz,
  5. battery- and mains-operated,
  6. operating system: Windows 7, Windows 10,
  7. modular hardware build-up,
  8. modular software build-up:
    Planning, inspection, evaluation of inspection results and data export. The use of databases throughout the whole process enables your company to access and organise the planning and inspection data. With the help of the report generator, the client is able to generate master copies,
  9. additional testing system types:
    Stationary testing systems: desktop version with scaleable hardware.

More Information


Tobias Müller
Phone: +49 (0) 681 / 9767153
Fax: +49 (0) 681 / 9767158