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02.102016Single Sided Weld Inspection Using Advanced Ultrasonic MethodsCategory "NDT Consulting and Techniques" | No comment


In general practices, ultrasonic weld examination requires probe placement on both sides of the weld to provide complete inspection coverage of the weld volume.  Some configurations restrict the probe placement to access from only one side of the weld. These weld joints are specified as one sided access weld joints. The requirement for examination of these kinds of welds is a common scenario faced in various industries.

Advanced ultrasonic examination methods such as Phased Array Ultrasonic Testing (PAUT) & Time of Flight Diffraction (ToFD) have provided effective volumetric examination for welds. This is true when scanning is performed from both sides. However for single-sided weld access, the limited scanning compromises the detection of lack of fusion on the bevel opposite to the probe side.

The authors from A-Star Training & Consultancy have studied and documented in a paper the ultrasonic response of opposite side sub-surface Lack of Fusion (LOF) in one sided access weld joints using ultrasonic examination techniques such as:

  • linear phased array tip diffraction technique,
  • linear phased array third leg examination
  • and DMA (Dual Matrix Array) ultrasonic technique.

The examination sensitivity of the 3 techniques and the detection proficiency between conventional phased array S-scan and Dual Matrix Phased Array are also presented. The conclusion is that the dual matrix array technique is better than the other techniques evaluated in the paper. Experimental results are compared with CIVA inspection simulations, showing good agreement between the two.

For more information, download the paper "Single Sided Weld Inspection using Advanced Ultrasonic Methods"  HERE.

The EXTENDE's team

01.182016Plane Wave Imaging for Ultrasonic NDTCategory "NDT Consulting and Techniques" | No comment

Ultrasonics - ELSEVIER

Developers and researchers from the CIVA development team have developed a new imaging technique combining the individual benefit of the medical PWI (Plane Wave Imaging) and of the TFM (Total Focusing Method).

How does it work?

Plane waves are used in transmission and then a post-processing algorithm is applied to the recorded signals  that lets you focus on every point of a region of interest. This method allows you to obtain an image quality equivalent to TFM images but with a higher frame-rate, increased acoustic power and simplified post-processing algorithm. 

This method is described in detail in a paper of the Ultrasonics Journal from Elsevier. You can download it here.

The EXTENDE’s team

About Extende

We believe that high quality and innovative Non Destructive Evaluation (NDE) will make our world a safer place and will help preserve the environment.

Therefore, our mission is to bring the benefits of Simulation and NDE Development Methodology to the NDE Community.

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