OBRABOTKAMETALLOV Vol. 25 No. 4 2023 technology Almost all specimens welded using the tested flux with all the welding parameters had an elongated crater with an average length of 100–110 mm and a depth of 1–1.5 mm, which is approximately twice the length of the weld crater occurring when using commercially available flux or 6 mm (Specimen 8). Ahigher heat capacity of the tested flux may attribute to it. Crater concavity suggests a higher density of the tested flux that interferes with the release of superheated gas and metal vapor pressure below the flux layer above the weld pool when the arc is stopped. Table 2 shows the GOST 8713-79-S4 weld size measurements for the specimens for a welded piece with a thickness of 5 mm. Ta b l e 2 Results of visual and dimensional inspection GOST 8713-79-S4 (for 5 mm thick workpieces) Weld cap width e, mm ≤ 23 Root bead width e1, mm 12 ± 4 Weld cap height g, mm 1.5 ± 1.0 Root bead height g1, mm 1.5 ± 1.0 Specimen 1 (600 A, 37 V) Measurement point Start Center End Weld cap width e, mm 17.5 15.9 18.6 Root bead width e1, mm 18.3 16.3 17.5 Weld cap height g, mm 2 1 3 Root bead height g1, mm 1 1 1 Specimen 2 (600 A, 37 V) Measurement point Start Center End Weld cap width e, mm 17 18 17 Root bead width e1, mm 14.2 13.5 13.8 Weld cap height g, mm 1.5 0 0.5 Root bead height g1, mm 3 4 4 Specimen 3 (500 A, 37 V) Measurement point Start Center End Weld cap width e, mm 16.5 17.4 16.6 Root bead width e1, mm 12.1 11 13.5 Weld cap height g, mm 2.5 2 2 Root bead height g1, mm 0 1 1 Specimen 4 (400 A, 37 V) Measurement point Start Center End Weld cap width e, mm 14.4 14 14.2 Root bead width e1, mm Lack of penetration 5.5 7 Weld cap height g, mm 1 2 1 Root bead height g1, mm Lack of penetration 1.5 1.5 Specimen 5 (450 A, 37 V) Measurement point Start Center End Weld cap width e, mm 15.7 15 15.8 Root bead width e1, mm 9.8 9 8.9 Weld cap height g, mm 0 0.5 0 Root bead height g1, mm 1 2 0
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