Propagation Behavior of Root Crack in Y- and y-Grooved Restraint Cracking Test of 80kg/mm^2 Class Steel on the Basis of AE Source Location Technique : Application of Acoustic Emission Technique for Weld Cracking (IV)(Materials, Metallurgy, Weldability)

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AE source location technique was applied to study the behavior of root cracking in restraint cracking test with Y-or y-groove with the aid of fractographic technique. Base metal used was weldable heat-treated high strength steel HT80 whose ultimate strength was 80kg/mm^2 class. Shielded metal-arc welding was done in the groove of the test specimen of HT80 and linear source location with AE technique was started after the completion of welding. Consequently two types of root cracks have been observed. The root crack in Type I mainly passes through the weld metal, and has a tendency to grow upwards namely toward the surface of weld metal. The root crack in Type II passes in the heat-affected zone in the early stage and then turned into the weld metal, and has a tendency to initiate and grow along the weld line in the early stage instead of their upward growth. The specimen which completely cracked in comparatively shorter period exhibits Type I.
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