OBRABOTKAMETALLOV technology Vol. 26 No. 2 2024 Ta b l e 1 Welding engineering properties of electrodes Electrode brand, manufacturer Arc excitation Sputtering Removability of slag Bead forming Sustained arc burning Fingernail Presence of defects on the surface TMU-21U Sudislavskiy plant of welding consumables 4 strong 3 4 3 Out of tolerance – TMU-21U St. Petersburg 4 slight 3 4 3 Within tolerance – TMU-21U ESAB 4.5 moderate 4 4 4 Within tolerance – CU-5 Sudislavskiy plant of welding consumables 3 slight 3 4 4 Out of tolerance – CU-5 St. Petersburg 4 slight 3 3 4 Out of tolerance – CU-5 ESAB 4 slight 5 4 5 Within tolerance – Ta b l e 2 Chemical composition of weld overlaid metal by TMU-21U electrodes, St. Petersburg Indicator name ND value Actual value Accuracy ND for test methods Carbon, wt. % 0.08 0.12 0.016 GOST 22536.1–89 Silicon, wt. % 0.28 0.26 0.03 GOST 28033–89 Manganese, wt. % 0.82 0.68 0.04 GOST 28033–89 Phosphors, wt. % 0.023 0.019 0.003 GOST 28033–89 Sulfur, wt. % 0.009 0.01 0.004 GOST 28033–89 Ta b l e 3 Mechanical properties of weld overlaid metal with TMU-21U electrodes, St. Petersburg No. Indicator name The value according to GOST 380-2005 Actual value ND for test methods 1 Yield strength σ0.2, N/mm2 ≥235 205, 265, 249 GOST 1497–84 2 Ultimate tensile strength σu, N/mm2 360–460 346, 378, 440 3 Ultimate elongation δ, % ≥27 24, 24, 28 4 Impact toughness KCU, J/cm2 ≥49 49, 51, 50 GOST 9454–78
RkJQdWJsaXNoZXIy MTk0ODM1