Phased array technology — scan plan methodologies for weld inspection

Couturier, Thierry; Olympus; France

Couturier, T.; Olympus; France

ID: ECNDT-0022-2018
Session: Qualification and standards 1
Room: J1
Date: 2018-06-14
Time: 13:50 - 14:10

For inspecting welds, phased array ultrasonic technology offers advantages in detection capabilities and interpretation, combined with flexibility. Phased array can be used either as a manual technique or in automated systems; in many cases, it can be used to replace radiography.
Most of the codes that govern the use of phased array require that inspectors build a scan plan and describe the associated parameters. However, these codes do not explain how to build a scan plan.

In this paper, I propose a scan plan methodology and describe the process using an example. Different codes will be illustrated, such as EN13588, API 1104, and ASME CC2235, and the example will consider the typical indications that must be detected in a weld. Next, I will review essential variables such as:
– How to select a phased array transducer
– Which beam angles to program
– How many elements should compose the active area
– How to consider the focusing effect
– What kind of tools can be used to help with the design
– Whether additional inspection methods should be considered

The technical content of the paper can help level 2 and level 3 experts to better understand how phased array technology works and how the essential variables can be considered to build a good scan plan.