• Title/Summary/Keyword: 예리함

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건축사의 제언

  • Kim, Ji-Deok
    • Korean Architects
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    • no.7 s.148
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    • pp.19-21
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    • 1981

  • 다음은 본회회원인 필자가 기교한 제언을 옮긴 것이다. 필자는 이 글에서 현재 우리나라 건축사들이 처하고 있는 현실과 이데 비친 제반문제점들을 예리하게 해부하고 자구책을 위한 방향을 제시했다. 회원제위의 깊은 공감이 기대된다.

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Study of the Weld Defects Identification Method by Ultrasonic Pulse Echo Patterns (초음파 펄스 에코 패턴으로 용접 결함 식별 방법 연구)

  • Kim, Won-Jung
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.14 no.12
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    • pp.6114-6118
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    • 2013

  • This study examined the ultrasonic pulse reflection method(UPRM) for testing each ultrasonic pulse waveform model(UPWM) based on weld defects. The sharp crack of a clear signal was generated. The echo height of the defective probes changed according to the location. In a long crack in a circle around the defective probes, the Swivel scanning echo height when using the particle was reduced drastically. The peaks in the echo were thin because the needle was pointed. The porosity defects arising from a single echo was sharp and crisp, but a number of pores of the collective reflection overlapped and ajagged echo was observed. Slag, slag inclusions, cracks, and defects at the Swivel scan of each particle using the echo shape showed difference in the degree. Cracks were revealed as sudden changes in the echo height of the slag inclusions: increase ${\rightarrow}$ decrease ${\rightarrow}$ increase ${\rightarrow}$ decrease. In addition, the location of a number of defects in the dense pore geometry, such as a typical echo sundry, revealed the shape in the slag. Poor penetration of the defect echo, revealed the cracks to have a sharp-edged, crack-like shape with an echo.

  • https://doi.org/10.5762/KAIS.2013.14.12.6114 인용 PDF KSCI