PSI - Issue 36

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

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Sergiy Kozulin et al. / StructuralIntegrity Procedia 00 (2021) 000 – 000

metal, as well as the standard requirements, by 2...4 times (Table). The values of KCU of metal in the weld area at the fusion boundary with the base metal correspond to that of the base metal.

Table. Impact toughness of welded joints and base metal

KCU, J/cm 2 at the temperature of, º C

Weld number (Fig. 4)

Steel

Test area

+ 20

- 20

- 40

74

49 54 12

12 25

1 2 3

140

Weld metal

37

- - -

HAZ in the weld joint

127 127

- -

2-1 4-3

Superheat zone at 0.75... 3.0 mm from the fusion line

74 59 34 46 37 34 74 54 98 86 49 39

49 49

12

1 3 1 3

35L

-

Normalization zone at a distance of 10...15 mm from the fusion line

9.8

12 12

39 12 14 49

Base metal

4,9

- -

DSTU 8781: 2018

10

-

1 3 4

- - - -

7.4

Weld metal

- - - - -

145

2-1 4-3

HAZ in the weld joint

34L-ESH

22

3 2 3

Normalization zone at a distance of 8...12 mm from the fusion line

-

-

22 12

7,4

Base metal

37

12

-

The results of the quantitative assessment of automatic heat treatment effect on the weld metal and the corresponding joints show that at MESW CN sequentially from one joint edge to the other, the volume of automatic heat treatment of the weld metal reaches 38.4%. When MESW CN welds are applied from the middle of the joint to its edges (Fig. 7), the volume of auto thermal treatment of the first (central) weld reaches 87% and of the rest (except external welds) – 30...43%. Consequently, in order to improve the quality of the welded joint obtained with MESW CN, the most preferable method is to apply welds in the scattered manner from the middle of the joint to its edges.

Fig. 7. Transversal macro section of 480 mm thick welded joint produced by MESW CN method.