Examination of the structural condition of welded joints in zirconium elements of nuclear reactors

2006 ◽  
Vol 20 (12) ◽  
pp. 965-969 ◽  
Author(s):  
E V Yudina ◽  
T M Poletika ◽  
S F Gnyusov ◽  
L B Zuev
Keyword(s):  
Welded Joints ◽  
Nuclear Reactors ◽  
Structural Condition

Structural condition and fatigue damageability of welded joints of steam pipelines

2020 ◽  
Vol 2020 (6) ◽  
pp. 17-22
Author(s):  
V.V. Dmitrik ◽  
◽  
A.K. Tsaryuk ◽  
O.S. Garashchenko ◽  
T.O. Sirenko ◽  
...  
Keyword(s):  
Welded Joints ◽  
Structural Condition

Structural condition and fatigue damageability of welded joints of steam pipelines

2020 ◽  
Vol 2020 (6) ◽  
pp. 14-19
Author(s):  
V.V. Dmytryk ◽  
◽  
A.K. Tsariuk ◽  
O.S. Garashchenko ◽  
T.O. Syrenko ◽  
...  
Keyword(s):  
Welded Joints ◽  
Structural Condition

Features of structure and properties formation in welded joints made of A500C and B500C strength classes reinforcing steels

2021 ◽  
pp. 28-33
Author(s):  
M. A. Sheksheev ◽  
A. B. Sychkov ◽  
S. V. Mikhailitsyn ◽  
E. S. Shemetova
Keyword(s):  
Mechanical Properties ◽  
Heat Affected Zone ◽  
Welded Joints ◽  
Strength Class ◽  
Welded Joint ◽  
Structural Condition ◽  
Additional Stress ◽  
Premature Failure ◽  
Slag Inclusions ◽  
Temporary Resistance

In the manufacture of welded reinforcing mesh, rolled products of various strength classes are used. High requirements for mechanical properties and structural condition are imposed on welded joints. Connections must provide a set of operational properties. This article presents the results of studies of the structure and mechanical properties of welded joints of reinforced rolled products of strength classes A500C and B500C, performed by spot welding. It is established that the weld (core) of A500C strength class steel is characterized by the presence of a layer of cast metal (hardness 180–190 HV) with slag inclusions. In the heat-affected zone, widmanstett ferrite and bainite — like structures with a hardness of 251–268 HV are observed. The temporary breaking resistance of A500C steel joints is 322–350 MPa. It is shown that the welded joint of steel of strength class B500C does not have a clear division into structural zones. Similar bainite structures in the form of batch formations are observed in the seam and the heat-affected zone. The hardness of the metal of the welded joint is in the range from 205 to 241 HV, and the level of temporary resistance is 510–525 MPa. It is established that the probable cause of premature failure of welded joints of A500C steel is the presence of large slag formations in the metal seam (core). This may be due to insufficient cleaning and preparation of the weld site. Particles of scale and other contaminants fall into the molten metal of the core and "freeze" in it, forming slag inclusions. Cavities filled with slag reduce the cross-section of the seam and as a result significantly weaken it. In addition, slag inclusions are additional stress concentrators and act as a source of destruction when an external load is applied. For the manufacturer of reinforcing nets, it is proposed, as a technological recommendation, to use additional tools for cleaning the welding site in the form of metal brushes or abrasive tools with additional surface degreasing.

The Selection of Parameters for Automatic Welding of the Nuclear Reactors Pipelines

2020 ◽  
Vol 989 ◽  
pp. 760-765 ◽  
Author(s):  
Gia Viet Ngo
Keyword(s):  
Weld Pool ◽  
Welded Joints ◽  
Calculation Method ◽  
Nuclear Reactors ◽  
Spatial Position ◽  
Welding Parameters ◽  
Automatic Welding ◽  
High Quality ◽  
Stable Production ◽  
Selection Of

In this paper, the author selected the optimal welding parameters, which allow to achieve a stable production of high-quality welded joints and gave the calculation method of welding parameters depending on the spatial position of the weld pool.

Structural condition and damage of metal of welded joints of steam pipelines

2021 ◽  
Vol 2021 (9) ◽  
pp. 38-42
Author(s):  
V.V. Dmitrik ◽  
◽  
I.V. Kasyanenko ◽  
Yu.M. Latynin ◽  
◽  
...  
Keyword(s):  
Welded Joints ◽  
Structural Condition
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