Total Focusing (TFM) for the Ultrasonic Testing (UT) of drawn arc stud welding

C. Romito, A. Hörtnagl, Marco Induti
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Abstract

This article describes the results obtained applying ultrasonic testing (UT) with phased arrays (PAUT) using full matrix capture (FMC) and total focusing method (TFM) for the inspection of drawn arc stud welding. Weld studs are usually directly applied on the top of a metal slab using a dedicated welding gun. This procedure involves heating the end tip of the stud using a strong electric arc created by a positive electric current. This welding procedure shall comply to various normative requirements, but on the other side there is not a clear reference to any applicable non-destructive method (NDT) to control the quality of the weld seam. Shear connectors are normally used in concrete/steel composite structures to allow the combined action of the concrete slab and the steel profile thereby increasing both the stiffness and strength of the structure. Flaws in this connection would result in severe bending and cracking of the entire structure. This article proposes an advanced UT method to inspect the weld between shear connections and metal slab using FMC. Data acquired with FMC are processed by TFM algorithms improving image resolution, signal to noise performances and allowing 3D data imaging. The combined use of PAUT searching units and signal processing with high resolution measurement shows a great potential in industrial NDT applied to civil engineering, resulting in a more effective, reliable, and faster inspection methodology than many other methods, such as radiographic testing (RT).
拉弧螺柱焊超声检测的全聚焦技术
本文介绍了相控阵超声检测(UT)采用全矩阵捕获法(FMC)和全聚焦法(TFM)检测拉弧螺柱焊的结果。焊接螺柱通常使用专用焊枪直接应用于金属板的顶部。这个过程包括使用由正电流产生的强电弧加热螺柱的末端。该焊接程序应符合各种规范要求,但另一方面没有明确提及任何适用的无损检测方法(NDT)来控制焊缝质量。剪切连接件通常用于混凝土/钢组合结构中,以允许混凝土板和钢型材的联合作用,从而增加结构的刚度和强度。这种连接的缺陷将导致整个结构的严重弯曲和开裂。本文提出了一种利用FMC检测剪切连接件与金属板焊缝的先进超声检测方法。FMC采集的数据通过TFM算法进行处理,提高了图像分辨率,信噪比性能,并允许3D数据成像。将PAUT搜索单元与高分辨率测量的信号处理相结合,在土木工程的工业无损检测应用中显示出巨大的潜力,从而产生比许多其他方法(如放射检测(RT))更有效、更可靠、更快速的检测方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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