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      超音波TANDEM斜角法에 의한 圓形 및 띠形缺陷의 크기 評價에 관한 硏究 = A Study on the Size Evaluation of Disc and Band Type Flaw by Ultrasonic Tandem Testing

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      https://www.riss.kr/link?id=A1989574

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      Generally, butt welds with plate thickness 30∼40mm are welded with gr angle 45。,60。,70。,etc. In the detection of internal weld defects, oblique testing with single probe has been mainly used. But, recently, in accordance with enlargement of welded structure, thick plate with 100-200mm are frequently required. Thus I-groove welding method was lately developed and often used, In this case, most frequently generated defects are the lack of weld penetration and incomplete fusion between base metal and welding material. If we would detect by oblique testing with single probe, detecting flaw is occassionally impossible or very underestimated.
      In this study, the limit for applying tandem method was studied in dise and band type flaws. The estimation of flaw size could be within 10% error compared to real flaws.
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      Generally, butt welds with plate thickness 30∼40mm are welded with gr angle 45。,60。,70。,etc. In the detection of internal weld defects, oblique testing with single probe has been mainly used. But, recently, in accordance with enlargement of ...

      Generally, butt welds with plate thickness 30∼40mm are welded with gr angle 45。,60。,70。,etc. In the detection of internal weld defects, oblique testing with single probe has been mainly used. But, recently, in accordance with enlargement of welded structure, thick plate with 100-200mm are frequently required. Thus I-groove welding method was lately developed and often used, In this case, most frequently generated defects are the lack of weld penetration and incomplete fusion between base metal and welding material. If we would detect by oblique testing with single probe, detecting flaw is occassionally impossible or very underestimated.
      In this study, the limit for applying tandem method was studied in dise and band type flaws. The estimation of flaw size could be within 10% error compared to real flaws.

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