Xstress Robot

Xstress Robot is capable of making measurements by X-ray diffraction easy and flexible with complicated parts, large or small.

xstress robot

  • Non-destructive
  • Accurate 6-axis industrial robot (additional axis possible as an option)
  • Automatic mapping on complicated parts, such as turbine blade is possible
  • Movable or fixed installation with safety enclosure
  • Easy replacement of X-ray tube (Cr, Cu, Co, Fe, V, Ti, Mn) which enables measuring different materials
  • Three measurement distances as standard: 50, 75 and 100 mm
  • Two NMOS position sensitive detectors
    Instantly adjustable 2θ-angle
  • XTronic software for running the measurement and calculating residual stresses and retained austenite content (optional)
  • d-sin²χ and Ω-measurement modes as a standard

Xstress Robot


  • Two symmetrically positioned NMOS position sensitive detectors
    • standard detector width 30°
    • for other detectors see options
  • 2θ-range of the detectors
    • continuously adjustable within 110° to 165°
    • lower angles as option with special detector arcs
  • Standard measurement distance 50 mm
  • Replaceable collimators
    • short and long collimators with 1/2/3/4/5 mm spot sizes
    • special collimators available as an option
  • X-ray tube
    • Cr-tube as standard: max. output 30 kV/9 mA/270 W
  • Xstress main unit (high voltage generator)
    • X-ray power supply 5–30 kV/0–10 mA freely adjustable within limits
    • self-contained liquid cooling system
    • includes all interlocks required for complete safety
    • universal power input
  • XTronic software
    • fully featured Windows software using thread based multi-tasking
    • hardware operation control: detectors, DC motors, power supply, shutter, safety interlock functions, voltage and current, etc.
    • automated calibration with zero stress powder samples to set diffractometer to sample distance
    • project manager for depth distribution measurement and all kinds of mapping measurements
    • library functions for material parameters
    • modified d-sin2χ and Ω-mode
    • peak shift determination with the most known methods such as cross-correlation and peak fit methods
    • peak fit with eight different functions and three background options: Gauss, Lorentz, Modified Lorentz, Intermediate Lorentz, Pearson VII, Split Pearson VII, Pseudo-Voigt and Split Pseudo-Voigt


xstress robot dimensions

Weight: 400 kg



XTronic takes care of the measurements with Xstress systems from running the measurement to calculating the residual stress or retained austenite values. XTronic software fulfills the new European X-ray residual stress testing standard EN 15305.

xtronic screenshot

Measurement tools easily available

XTronic has a powerful graphical interface. Setting up the parameters and creating and executing a new measurement is quick and easy even for measuring complex shaped samples. Measurement and data handling tools are easily accessible in main and measurement toolbars. These toolbars can be hidden and moved according to your needs. Connections, X-ray tubes and operation power of the system are managed with the X-ray control tool. X-ray control side bar provides one quick and convenient access to all tools for starting the measurement. If not needed, the X-ray control side bar can be hidden, e.g. to make more room for the measurement information and result windows.

Real-time measurement data

All relevant measurement data is visible real time on the measurement window. You can easily view intensity distributions in different stages of analysis and in different scales. The software updates the graphs and calculation results after each finished measurement stage. You can also view all other possible graphics from d-sin2χ distributions and stress distributions to graphs of mapping projects by couple of simple mouse clicks. Autosave option helps to make sure you do not loose your measurements.

XTronic supports stress measurement in the modified χ as well as in ω mode. While the modified χ mode is the most commonly used, sample geometry can make it impossible or impractical. Then ω mode is the better option, e.g. for measuring a gear root in axial direction.

Measurement settings are easy to access, make and modify as they are all visible at the same time in one window.

The Project tool allows you to combine multiple stress or austenite measurements and automatically generates graphs and tables of the results. Typical uses are depth profiles, e.g. of shot-peened surfaces or stress distributions across weld seams. Each project can include several measurement series. The Project tool is fully integrated into the software, requires very little extra effort and makes access to the data much easier. Graphs tab contains for example depth profile graph including all the measurements made for the series. Stress profile graphs can be viewed in details e.g. with error bars.

Among many different calculation methods the advanced peak fit method can be used to calculate residual stress and retained austenite values.


To complement the Xstress family we have a number of options to make measurements even easier, faster, and safer.

See Xstress options page for details.

Diffractometer options

  • Detector filters
  • Detector arcs for RS
  • Mythen detectors
  • Retained austenite
  • X-ray tubes
  • Extended legs
  • Collimators
  • Cooling

Sample handling

  • Mapping (X-Y) devices
  • Rotation devices
  • Elastic constant devices
  • Vices

Enclosures (safety)

  • Table for X-ray
  • Cabinets
  • Safety walls
  • Option for enclosures and safety walls

Depth measuring options

  • Electropolisher
  • Depth measuring stand
  • Dial indicator tools

Calibration options

  • Powder samples


  • Reference samples
  • X-ray camera
  • PC
  • Commissioning & Training
  • Language options


ANSI N43.3 – 1993

Have questions about the Xstress Robot? We're ready to help you!

Our knowledgeable engineers will discuss your testing needs with you and recommend the best solution for your application