• Title/Summary/Keyword: 용접결함

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Development of a Simulation Tool and a Monitoring System for Laser Welding Quality Inspection (레이저 용접품질 검사기법 개발을 위한 시뮬레이션 툴과 이를 이용한 감시 시스템의 개발)

  • 이명수;권장우;길경석
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.5 no.5
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    • pp.985-993
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    • 2001

  • Neural networks are shown to be effective in being able to distinguish incomplete penetration-like weld defects by directly analyzing the plasma which is generated on each impingement of the laser on the materials. The performance is similar to that of existing methods based on extracted feature parameters. In each case around 93% of the defects in a database derived from 100 artificially produced defects of known types can be placed into one of two classes: incomplete penetration and bubbling. The present method based on classification using plasma is faster, and the speed is sufficient to allow on-line classification during data collection.

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Eddy Current Testing of Weldment by Plus(+) Point Probe (Plus(+) Point Probe를 이용한 용접부 와전류검사)

  • Lee, Hee-Jong;Kim, Yong-Sik;Nam, Mim-Woo;Yoon, Byung-Sik;Kim, Seok-Kon
    • Journal of the Korean Society for Nondestructive Testing
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    • v.19 no.6
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    • pp.426-432
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    • 1999

  • A plus-point eddy current test(ECT) probe was developed to examine the defects on the welds of pumps, valves, and pipings which are the major components of the electric power plants, non-destructive evaluation (NDE) techniques for detecting and sizing the flaws were studied adapting this probe. Differential plus-point ECT probe is consists of two "I"-type coils crossed each other and has an advantage having a small influence on the sensitivity by lift-off variation to the conventional types of probe. The specimens with crack-like electro discharge machining(EDM) notches on the weld of type 304 stainless-steel were fabricated in order to evaluate the plus-point ECT probe response to the flaws. NDE techniques to detect and size the flaws and estimate the flaw type were established with this specimens.

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