Impact Toughness of Welded Joints on 34KhN2MA Steel Produced from Electrodes with Various Phase Compositions

Dzyubyk, A. R.

doi:10.1007/s11003-020-00416-y

Cited by 8 publications

(8 citation statements)

References 3 publications

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“…We must single out the issue of the appropriate glorification and the thermal impact zone of the primary material structure. It is indicated works [12][13][14] the danger of obtaining hardening structures and the structure heterogeneity due to the excellent chemical composition with the primary metal. It is necessary to use various technological measures such as heating parts before surfacing and appropriate surfacing techniques to avoid residual deformation and reduce welding stresses, reduce the depth of the pipe worn wall penetration etc.…”

Section: Review Of Modern Information Sources On the Subject Of The P...mentioning

confidence: 99%

“…We can well regulate the latest properties of the weld metal. Still, the diffusion processes of the elements are not so active that they also enable to affect the main metal properties [13][14][15]. In this case of core pipe surfacing, the thermal cycle will affect the structural-phase composition formation of the central metal thermal influence zone.…”

Section: Main Materials Presentationmentioning

confidence: 99%

“…It determines a range of negative factors, including the transience of geyser arc surfacing processes, the existence of a significant temperature gradient (from maximal metal fusion to the surrounding workshop conditions) in a limited volume, the presence of cold pipe sections that hurt the temperature range of material, the fragility of availability temperature and residual stresses in the surfacing process, etc. [13][14][15]. The most critical factor that impacts the structural-phase composition formation of the material in the zone of welded core pipe thermal influence is at the same time a cooling speed.…”

Section: Main Materials Presentationmentioning

confidence: 99%

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Strengthening and reconstructionof drilling core pipe for engineeringand geological exploration

Dzyubyk¹,

Dzyubyk²,

Shpak³

2022

UJMEMS

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Currently, there is a tendency to increase the depth of gaseous and liquid fossils extraction. Therefore, prospecting and developing new deposits is promising. There is also a need to create new freshwater sources and implement relevant geological work based on this need. It is essential to have information about the characteristics of the explored slabs and the geology of the fields in general. Implementation of engineering and geological core drilling exploration is the most acceptable and provides the necessary data. Here, the peculiarities of the technological schemes of the process implementation make it possible to obtain separate sections of structures at a depth of the drilling equipment. It is essential to use traditional equipment, recommended for decades and provides the necessary results [1–3]. In the drilling process, you can achieve different diameters and depths of wells execution, obtain fossil samples etc. Engineering and geological exploration drilling is now taking on increased use in various industries [3]. Therefore, the problem of providing high- quality drilling tools, the stability of their operating characteristics, and the possibility of usage in different conditions is an urgent need today. Modern drilling problems determine the usage of components of the core set with the appropriate physical and mechanical characteristics. Especially it relates to elements close to the drilling tool and the place of fossil; destruction – drill pipe. It is installed immediately after the crown core drill and receives almost the same loads and effects during working [1–3]. Conditions for the implementation of the process of core drilling are characterized primarily by the effect on the elements of the significant axial and twisted core set forces. There is the influence of the corrosive and active environment of the fossil in the washing and lubricating liquids well, etc. High temperatures are also observed at the drilling sites [3], which negatively affect the working tool and speed up its operation. As a result, there is an intensive shock, and abrasive core pipe wear and operation indicators change their constructive size. As a result, it is necessary to replace the operated drill string periodically. Considering modern technical and economic factors, it may be decided to repair a pipe to its original size in many cases. There are tasks for providing the appropriate characteristics of the core pipe surface. It is possible to model such properties of the new surface that functionally the best meet the conditions of the drilling process of a given geological formation. The peculiarities of applying the therapeutic layer on the surface of the core pipe are investigated in work. The experience shows that using electric arc surfacing under the flux layer is expedient. This provides the necessary adhesion of the applied layer and promotes obtaining resistance to the operation surface of the core pipe. At the same time, there is high-quality protection and the possibility of additional alloying through the flux-slaggy welding bath. Using electrode powder type wires creates conditions for flexibility to achieve the established characteristics of functional layers [4–6]. The filling flux, located in the cross-section of the electrode wire, can be easily changed by chemical composition. At the same time, it is possible to make relatively small parties of a wire with the set characteristics. The technological scheme justification about the core pipe surfacing is performed. It provides the previous displacement of the electrode butt size from the zenith of the core pipe to prevent the welding bath from spreading. The structural pipe size , the requirements for residual deformations, and the conditions of shapping the welded layer show the practicality of welding on a helix.

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Section: Review Of Modern Information Sources On the Subject Of The P...mentioning

confidence: 99%

Section: Main Materials Presentationmentioning

confidence: 99%

Section: Main Materials Presentationmentioning

confidence: 99%

See 1 more Smart Citation

Strengthening and reconstructionof drilling core pipe for engineeringand geological exploration

Dzyubyk¹,

Dzyubyk²,

Shpak³

2022

UJMEMS

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show abstract

“…The chosen design scheme of heat distribution should take into account the conditions of the process, the properties of the base metal and the structural dimensions of the welded joint [8], [9]. As a result, it is possible to assess not only the tendency of steel to crack, but also the structural-phase composition and mechanical properties of the metal in the zone of thermal impact of the joint [10], [11].…”

Section: Analysis Of Literary Sourcesmentioning

confidence: 99%

“…This makes it possible to investigate the uniformity of the welded joint and its crack resistance in the area of the weld metal. Due to the uneven chemical composition, it is possible to form areas with structural inhomogeneity, which can further lead to local defects such as cracks [11]. The design of the cylinder liner indicates a complex stress in the vicinity of the weld with a ring seam [13].…”

Section: Analysis Of Literary Sourcesmentioning

confidence: 99%

Features of repair welding of power hydrocylinder elements

Dzyubyk¹,

Nazar²,

Dzyubyk³

2020

Ukr. j. mech. eng. mater. sci.

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At present, the use of power hydraulic cylinders is an integral part of most industrial equipment. They provide translational and horizontal movements, replacement of goods, fixation, etc. These devices are necessary elements of the equipment where application of the corresponding level of effort is applied. Often hydraulic cylinders are created specialized to perform certain types of work. It should be noted that part of the elements of the power cylinder in the manufacture is combined with welding. Such integral connections provide rigidity of installation, tightness of a design, fatigue strength at multicycle loadings. Difficult operating conditions, significant workloads, the presence of various external factors often leads to the destruction of individual elements of the cylinder. At the same time, the cost of repairing equipment that involves replacement with new power devices is quite high. This causes the implementation of repair and restoration work carried out at specialized enterprises. However, in the case of repairs, there are often a number of problems that require prompt resolution in the production environment. These should include the provision of basic materials with similar physical and chemical properties, the establishment of welding modes, the selection of the necessary welding materials, the use of appropriate techniques for conducting the arc process, etc. Therefore the repaired welded design of the case of the power hydraulic cylinder needs additional studying for weldability of separate elements among themselves, formation of a zone of thermodeformation influence. In general, the repaired hydraulic cylinder should meet the installation operating requirements depending on the purpose. The design of the considered hydraulic cylinder of the press installation is rather technological from the point of view of maintenance of automation of welding process. It contains long welds of a simple ring configuration. At the same time, the significant linear dimensions and the presence of a cylindrical surface cause some complexity in the implementation of processes. The construction material of the power hydraulic cylinder is low-carbon low-alloy steels. The analysis of technological weldability indicates a tendency to crack due to the thermal cycle of welding. The simulation of welds of the power hydraulic cylinder is performed in the work. The number of rollers was taken into account when obtaining butt welds. A comparative analysis of different electrode materials with different doping systems is done. The most applicable welding materials by chemical composition and properties of the weld metal are determined. According to the literature data and the results of comparative analysis, the optimal range of cooling rate of the main material of the hydraulic cylinder was established. The properties and structure of the zone of thermal influence of the butt welds of the power hydraulic cylinder have been studied. The magnitude of deformations and stresses caused by the thermal cycle of welding of the shell structure of the hydraulic cylinder liner is investigated. The admissible parameters of the zone of plastic deformations during butt welding are determined.

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Investigation in Structure of Fusion Zone of Welded Joint of High-Strength Steel with Austenite Weld

Dzyubyk,

Lisovska,

Voitovich

et al. 2024

New Technologies, Development and Application VII

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Impact Toughness of Welded Joints on 34KhN2MA Steel Produced from Electrodes with Various Phase Compositions

Cited by 8 publications

References 3 publications

Strengthening and reconstructionof drilling core pipe for engineeringand geological exploration

Strengthening and reconstructionof drilling core pipe for engineeringand geological exploration

Features of repair welding of power hydrocylinder elements

Investigation in Structure of Fusion Zone of Welded Joint of High-Strength Steel with Austenite Weld

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