Technological features of repair cracks in ship plates by comb cutting method

2021 ◽  
pp. 47-55
Author(s):  
М.А. Москаленко ◽  
И.Б. Друзь ◽  
Е.П. Патенкова
Keyword(s):  
Welded Joints ◽  
Practical Application ◽  
Effective Parameters ◽  
Cutting Method ◽  
Outer Skin ◽  
Complex Operation ◽  
Analytical Research ◽  
Ship Repair ◽  
Welding Materials

Ремонт трещин в судовых пластинах является наиболее ответственной и сложной операцией Задача получения заданных размеров проплава с обратной стороны свариваемого металла резко усложняется в тех случаях, когда доступ к обратной стороне шва затруднен или вообще невозможен, выполнение двухсторонних сварных швов на наружной обшивке корпуса судна, в большинстве случаев для доступа к поврежденным районам, приводит к увеличению числа сопутствующих работ по демонтажу (монтажу) оборудования и влияет на нормативные сроки ремонта судов, в том числе и при стоянке судов в доке. В данной работе излагаются результаты исследования эффективности технологии ремонта трещин, в судовых пластинах, путем ориентации сварочной ванны вдоль плоскости повреждения, за счет гребенчатой разделки поврежденного района с различной геометрией кромок. Представлены результаты аналитического исследования и факторных экспериментов оценки прочности сварных соединений с различной геометрией гребенчатой разделки, при односторонней сварке, с использованием различных сварочных материалов и варьировании режимов сварки. Приведены результаты металлографического исследования (на макрошлифах) полученных сварных соединений. Предложены технологически эффективные, для практического применения в судоремонте, параметры гребенчатой разделки трещин в судовых пластинах. Repair of cracks in the ship plates is the most responsible and complex operation The task of obtaining the specified dimensions of the melt on the reverse side of the welded metal is sharply complicated in cases where access to the reverse side of the seam is difficult or even impossible, the implementation of double-sided welds on the outer skin of the hull of the vessel, in most cases for access to damaged areas, leads to an increase in the number of related works on the dismantling (installation) of equipment and affects the normative terms of repair of vessels, including when ships are parked in the dock. This paper presents the results of the study of the effectiveness of the technology of repair of cracks in the ship plates, by orienting the welding bath along the damage plane, due to the comb cutting of the damaged area with different geometry of the edges. The results of analytical research and factor experiments assessment of the strength of welded joints with different geometry of comb cutting, with one-sided welding, using different welding materials and varying welding modes. The results of metallographic research (on macro-grinds) of the obtained welded joints are given. Technologically effective parameters of comb cutting of cracks in ship plates are proposed for practical application in ship repair.

scholarly journals Welding of pipes in fixed position with internal anti-corrosion protection of joints

2021 ◽  
Vol 225 ◽  
pp. 05005
Author(s):  
Elena Bogomazova ◽  
Irina Ziyatdinova ◽  
Dmitriy Aiduganov ◽  
Anna Pershina ◽  
Alexey Anikeyev
Keyword(s):  
Corrosion Protection ◽  
Welded Joints ◽  
Oil And Gas ◽  
Negative Impact ◽  
Fixed Position ◽  
Inner Surface ◽  
Transition Structures ◽  
Oil And Gas Pipelines ◽  
Clad Steel ◽  
Welding Materials

The article reviews the weldability of clad steel used for protection of inner surface of oil-and-gas pipelines from corrosion by different welding materials. It is indicated that during welding of the root pass by stainless electrodes in one pass the transition structures appear on the interface of two dissimelar metals. This process leads to the formaion of cracks. To reduce negative impact of the transition structures on the characteristics of welded joints it is recommended to weld the first two passes with strainless electrodes.

scholarly journals The amount of heat input to the weld per unit length and per unit volume

2021 ◽  
Vol 1199 (1) ◽  
pp. 012067
Author(s):  
J Winczek ◽  
M Gucwa ◽  
K Makles ◽  
M Mičian ◽  
A Yadav
Keyword(s):  
Comparative Analysis ◽  
Welded Joints ◽  
Heat Input ◽  
Unit Volume ◽  
Unit Length ◽  
Practical Application ◽  
Actual Amount ◽  
Volume Unit ◽  
The Individual ◽  
Volume Method

Abstract This paper presents a comparative analysis of heat input per unit length and per unit volume for selected methods of welding. The purpose of the analysis is to assess the usability of calculating heat input per volume unit. The interpretation of heat input per unit length according to the standards: QW-409.1 of ASME IX, EN ISO 1011-1 is discussed. The concept of calculating heat input per unit volume is described. For exemplary padded welds and spot welded joints, the heat input values were calculated in accordance with the above-mentioned standards and based on the concept of heat input per unit volume. The study showed a lack of consistency between the individual standards in the interpretation of the heat input. In addition, the practical application of the heat input per unit volume method in calculating the actual amount of heat introduced into the weld was justified.

scholarly journals Fracture Toughness, Breakthrough Morphology, Microstructural Analysis of the T2 Copper-45 Steel Welded Joints

Materials ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 488 ◽  
Author(s):  
Hao Ding ◽  
Qi Huang ◽  
Peng Liu ◽  
Yumei Bao ◽  
Guozhong Chai
Keyword(s):  
Fracture Toughness ◽  
Welded Joints ◽  
Mixed Model ◽  
Experimental Testing ◽  
Microstructural Analysis ◽  
Bending Test ◽  
Dissimilar Welding ◽  
Tensile Fracture ◽  
Three Point Bending ◽  
Welding Materials

The performance and flaws of welded joints are important features that characteristics of the welding material influence. There is significant research activity on the performance and characteristics of welding joint materials. However, the properties of dissimilar welding materials and the cracking problem have not been thoroughly investigated. This investigation focuses on the evaluation and analysis of fracture mechanics, including fracture toughness, microstructural analysis, and crack initiation of T2 copper-45 steel dissimilar welding materials. Standard tensile and three-point bending experiments were performed to calculate the ultimate strength, yield strength, and elastic modulus for fracture toughness. The macro/micro-fracture morphology for tensile fracture and three-point bending fracture were analysed. Based on these investigations, it was concluded that the fracture types were quasi-cleavage and an intergranular brittle fracture mixed model. The deflection of the crack path was discussed and it was determined that the crack was extended along the weld area and tilted towards the T2 copper. Finally, the crack propagation and deflecting direction after the three-point bending test could provide the basis for improvement in the performance of welded joints based on experimental testing parameters and ABAQUS finite element analysis.

scholarly journals Influence of welding materials on fatigue strength of fillet welded joints made from high strength steel.

1996 ◽  
pp. 133-140 ◽  
Author(s):  
Kazuo Tateishi ◽  
Kab-Soo Kyung ◽  
Fumitaka Machida ◽  
Chitoshi Miki
Keyword(s):  
Fatigue Strength ◽  
Welded Joints ◽  
High Strength Steel ◽  
High Strength ◽  
Welding Materials

scholarly journals Mosaic Panel «Scythian Ukraine – Steppe Hellas» of Mykola Storozhenko. Architectonics of the Plastic Space

2019 ◽  
pp. 215-220
Author(s):  
O. Solovei
Keyword(s):  
Visual Perception ◽  
Creative Process ◽  
The Other ◽  
Practical Application ◽  
Education Programs ◽  
Wide Range ◽  
Analytical Research ◽  
Auxiliary Material ◽  
Composition Structure ◽  
Symbolic Formation

This article shows architectonical features of the plastic space in the mosaic panel of Mykola A. Storozhenko «Scythian Ukraine – Steppe Hellas» (1987–1992) and analyzes the composition structure of this work in the context of interrelationships of the multi-faceted imagery and symbolic formation. Nowadays a wide range of such completely concrete formal artistic aspects as composition structure features and architectonics of the plastic space in monumental works of Mykola Storozhenko, in particular his mosaic panels, are still understudied. By making a compositional and constructive analysis the author has revealed interrelationships forming between plastic space elements of the work in the course of the internal imagery interaction and has drawn associative conceptual parallels. The author considers the complex imagery panel system in the context of visual perception focused on symbolic and information as well as national and historical plans of the composition idea. As exemplified by the mosaic panel «Scythian Ukraine – Steppe Hellas» it has been shown that all means of artistic expression aim to establish a stable and architectonically complex plastic system. As a result of research the author of this article proves that the integrity of the imagery is guaranteed by each of the above formal and conceptual composition elements; each of them has its function and creates an irreplaceable and unique constructive imagery fragment in the plastic space of the mosaic panel. On the other hand, the emphasis is made on the fact that only the total effect of interaction of all vectors leads to the powerful multi-layer imagery and symbolic formation which depth the architectonical vertical of archetype and moment of perception comes through and unfolds to the outside. Materials of this analytical research are quite important when solving a question of the theoretical and practical application directly in the creative process in order to improve education programs for composition and as a methodological auxiliary material for students of creative specialties and art expert students.

Practical Application of the N-SIF Approach in Fatigue Strength Assessment of Welded Joints

2009 ◽  
Vol 53 (3-4) ◽  
pp. R76-R89 ◽  
Author(s):  
Paolo Lazzarin ◽  
Filippo Berto ◽  
Michele Zappalorto ◽  
Giovanni Meneghetti
Keyword(s):  
Fatigue Strength ◽  
Welded Joints ◽  
Practical Application ◽  
Strength Assessment ◽  
Fatigue Strength Assessment

Analytical Research of the Stress-Deformed State in the Rock Massif around Faulting

2018 ◽  
Vol 35 ◽  
pp. 77-88 ◽  
Author(s):  
Vasyl Lozynskyi ◽  
Pavlo Saik ◽  
Mykhailo Petlovanyi ◽  
Kateryna Sai ◽  
Yevhenii Malanchuk
Keyword(s):  
Evaluation Method ◽  
Analytical Calculation ◽  
Sufficient Accuracy ◽  
Rock Massif ◽  
Tectonic Activity ◽  
Practical Application ◽  
Geological Faults ◽  
Deformed State ◽  
Analytical Research ◽  
Coal Reserves

In this paper, the geological faults in the zone of stable geodynamic and tectonic activity are studied. The purpose of the analytical research is to establish regularities of rock pressure in the hanging and foot walls of the geological fault and its influence on the state-deformed state of the rock massif. Comprehensive methodology that included analytical calculation will be implemented in the work. Taking into account the complexity of determining the stress-deformed state of the rocks, evaluation method of tension is adopted. Results of previously conducted computer modeling results are compared with analytic data. Conclusions regarding the implementation of the offered method are made on the basis of undertaken investigations. The obtained results with sufficient accuracy in practical application will allow consume coal reserves in the faulting zones.

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