Quality Evaluation of Welded Joints for Structural Steels with the Ultrasonic Detection of Lack of Penetration and Fatigue Test

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Other Title
  • 構造用鋼溶接継手の溶込み不良の超音波による検出と疲労試験による品質評価

Abstract

For purpose to obtain she fundamental data of securing the reliability of welded joints, the establishment of welding control technique to make weld defects of arc welded joints in the natural condition, the design and trial making of ultrasonic point focussed probe in order to detect quantitatively planar defects and their application were carried out. And also, effects of the lack of penetration with one side welding of SM50B steels on the fatigue test results of welded joints were investigated. The main results are as follows;<BR>(1) Relation between the lack of penetration and welding condition in gas metal arc (GMA) welding were made clear.<BR>(2) The point focusing angle probe using spherical tansduser in ultrasonic detecting method was pplied to the measurement of the size of lack of penetration. In case that the root face of butt welded joint was gas cut, the detecting accuracy was about±0.5 mm. However, in case that there were blow-holes or some weld defects on the way of passing of ultrasonic beam or near the root, the size of planar defect was often mistaken. And also, in case that the root face was closely attached by welding, the detection of lack of penetration was often difficult.<BR>(3) The uniaxial stress fatigue strength of arc welded joints for SM50B steels which have the lack of penetration of about 2-4 mm in depth, without reinforcement and finished surface, was extremely lower than that of base metal and welded joints which have full penetration, without reinforcement and finished surface. And the fatigue strength of arc welded joints with reinforcement showed the intermediate values between that of base metal or welded joints which have without reinforcement and finished surface and that of welded joint which have the lack of penetration of about 2-4 mm in depth, lowered fairly in comparison with that of base metal. These test results were discussed with non-linear fracture mechanics, consequently, the fatigue limits of welded joints are evaluated with effective notch depth as a whole.

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Details 詳細情報について

  • CRID
    1390282681475940224
  • NII Article ID
    130003763659
  • DOI
    10.2207/qjjws1943.51.775
  • ISSN
    18837204
    00214787
  • Text Lang
    ja
  • Data Source
    • JaLC
    • Crossref
    • CiNii Articles
  • Abstract License Flag
    Disallowed

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