Abstract
This paper evaluates the performance of ultrasonic testing using the advanced Phased Array Technique (PAUT) applied to T-branch welded joints with unilateral access. The base material of the components forming the welded assembly is the thermally resistant martensitic steel grade P91 (9Cr1MoVNbN). The welding processes used to fabricate the assembly were TIG (Tungsten Inert Gas) for root pass deposition, and SMAW (Shielded Metal Arc Welding) for filling the joint. The quality assessment aimed to analyze the welding-induced imperfections, considering the known susceptibility of this material to creep failure during prolonged service at temperatures of 300–500°C, which can lead to aging effects, diffusion of chemical elements, and microstructural degradation. Due to geometrical constraints and limited accessibility imposed by the pipe system configuration containing the examined welded joint, a single-direction Phased Array Ultrasonic Testing (PAUT) inspection (unilateral scan) was selected. Consequently, the inspection represents a deviation from the ideal application conditions specified in ASME Boiler and Pressure Vessel Code, Section V, Article 23 (SE-213).
Cuvinte cheie
Phased Array Ultrasonic Testing (PAUT)
ultrasonic testing (UT)
single-sided scanning
P91 steel
limited access inspection
Istoric articol
Publicat
01.04.2026
Informații autori
Citare recomandată
Erman-Ylmaz IBRAM, Ionelia VOICULESCU, Ionuț RADU (2026). Case Study on the Use of Advanced Phased Array Ultrasonic Testing Method on Limited Access T-Joint Welds Made of P91 Steel. Journal of Fiability and Durability, 1(1), 7–19. https://doi.org/10.65631/JFD.1(37).2026.1
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