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核破砕中性子源水銀ターゲット容器の溶接検査へのフェーズドアレイ超音波法の適用性検討

Feasibility study of applying phased array ultrasonic method to weld inspection of mercury target vessel for spallation neutron source

涌井 隆 ; 若井 栄一 ; 直江 崇  ; 粉川 広行 ; 羽賀 勝洋 ; Zhou, Y.*; 小林 昭彦*

Wakui, Takashi; Wakai, Eiichi; Naoe, Takashi; Kogawa, Hiroyuki; Haga, Katsuhiro; Zhou, Y.*; Kobayashi, Akihiko*

J-PARCの核破砕中性子源の水銀ターゲット容器(幅1.3m、長さ2.5m)は、水銀容器と二重壁構造を持つ保護容器からなる薄肉(最小厚さ3mm)の多重容器構造で、溶接組立による複雑な構造を持つので、溶接部の検査が重要である。溶接検査の精度を向上することを目的として、新たなフェーズドアレイ超音波法の適用性を検討した。疲労き裂を有する厚さ3mmの試験片を用いた試験とシミュレーションを行った。き裂が短い場合、超音波試験で評価された長さは過大評価された。センサの周波数を高くすると、その差異が小さくなり、測定精度の向上が見込まれることが分かった。

A mercury target vessel has been used for the spallation neutron source at J-PARC. It has a complicated multi-layered structure composed of a mercury target and surrounding double-walled water shroud, which is assembled with thin plates (minimum thickness of 3 mm) by welding. Thus, welding inspection during the manufacturing process is important. We investigated the applicability of new ultrasonic inspection, named as phased array ultrasonic method, to improve the accuracy of welding inspection for the mercury target vessel. Experiments and simulations of the phased array ultrasonic method were conducted using3-mm-thick specimen with a fatigue crack. In the case of short crack, the ultrasonic test overestimates the crack length. The difference was small by using sensor with a high frequency, suggesting a possibility of further improvement.

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