PSI - Issue 30

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

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

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Fig. 4. The block diagram of the experiment to determine the hydrogen content in the weld metal.

We use the glycerol method to determine the concentration of hydrogen in the weld metal (see Fig. 5). Samples of pencil type are welded on a copper mold with forced water cooling. After welding, a pencil-type sample of the deposited metal of the electrode is placed in water with a temperature of not more than 10 °C. Cooling in water is carried out for no more than 2 minutes, after the surface of the sample is cleaned from all sides with a wire brush from slag, welding scale. Samples are placed in a eudiometer, and turned 180 °, is poured with a locking fluid. The temperature of the locking fluid, in particular glycerol, must be maintained within the range of 40 – 70 ° C. The experiment continues for 72 hours. After the volume of diffusion hydrogen released from each sample is fixed, the sample is weighed on an analytical balance with an accuracy of ± 0.001g, and the initial concentration of diffusion hydrogen in the deposited metal is determined by the GOST 23338-91 the following formula 2 100 H D spec V H m   . (1) 3. Results and discussions Thus, on the basis of the analysis of the experimental and theoretical work done to improve methods of Implant machine test method, technological sample of Tekken method and others, we propose the following experimental procedure for estimation the technological strength of welded divided into stages Fig. 5. In turn, in Fig. 6, the applied a block diagram of parameters for assessing the technological strength of welded joints is proposed, which reflects the whole complex of measured experimental parameters necessary for estimation the formation of cold cracks in a weld.