PSI - Issue 30

G.N. Sleptsov et al. / Procedia Structural Integrity 30 (2020) 154–161

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Sleptsov G.N. et al. / Structural Integrity Procedia 00 (2020) 000–000

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Fig. 1. Improvement by modern measuring instruments installation of delayed fracture "Implant".

The most common breakdown in research of steels included in GOST 26388-84 is the Tekken hard process test (see Figure 2a). It is made as follows, at the edges the sample is welded according to the given technological version from two sides with full penetration (section B-B). In the middle of the sample, imperfection is imitated (section AA). The most commonly used Y-shaped and Y-shaped cutting of the welded edges. The welded sample is aged after welding for 20 hours. Cold cracks in Tekken samples that are not destroyed during testing and have no visually observed cracks are detected using non-destructive testing methods (according to GOST 14782-86), oxidative heat treatment or by etching the surface of the weld root and the adjacent heat affected zone with 5% nitric acid.

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b

Fig. 2. (a) scheme of technological sample Tekken, according to GOST-26388-844; (b) Location of AE sensors on the technological sample Tekken