PSI - Issue 36

Sergiy Kozulin et al. / Procedia Structural Integrity 36 (2022) 247–253 Sergiy Kozulin et al. / StructuralIntegrity Procedia 00 (2021) 000 – 000

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4

processes. In the investigated case, the change in the shape of crystals in the sequence of execution of multi-pass weld is caused by gradual heat saturation of the sample and corresponding decrease in the cooling rate of the crystallizing weld metal.

a

0 0,4 0,8

ω 6/5 , ºС/с

1

2

3

4

n Critical ω 6/5 = 7 ° C /с

b

Fig. 3. Thermal cycles of HAZ metal in MESW CN (a) and dependence of cooling rate of HAZ metal on number of produced weld (b).

Fig. 4. Macrostructure of central part of longitudinal section of multi-pass electroslag weld at the specimen of 34L-ESh steel (a) and character of hardness change along its zones (b): 1 and 2 – the lines of hardness measurements; No1…No4 – succession of producing welds.