Experimental studies of heat treatment influence on the welded connections properties in working mechanisms of road building
Introduction. The experimental studies of the heat treatment effect on the properties of welded joints in working mechanisms of road-building machines are carried out in the work. Studying the structures of the metal itself, as well as welded joints and considering their heterogeneity, the author an...
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Siberian State Automobile and Highway University
2020-12-01
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| Series: | Вестник СибАДИ |
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| Online Access: | https://vestnik.sibadi.org/jour/article/view/1165 |
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| author | A. Р. Scherbakov |
| author_facet | A. Р. Scherbakov |
| author_sort | A. Р. Scherbakov |
| collection | DOAJ |
| description | Introduction. The experimental studies of the heat treatment effect on the properties of welded joints in working mechanisms of road-building machines are carried out in the work. Studying the structures of the metal itself, as well as welded joints and considering their heterogeneity, the author analyzes the strength characteristics of these objects.Materials and methods. By means of metallographic analysis, as well as using boron-containing steel 30MnB5, which is used for the manufacture of structures for construction machines, as a research material, the author examined its microstructure, which took place in certain zones of welded joints. In particular, welded jointss, fusion zones with an overheating area, a complete recrystallization area and the base metal were studied. We also studied the features of cold plastic deformation of the specified steel sample.Results. It was determined that the mechanical inhomogeneity of the steel at these joints is the cause of the structural inhomogeneity of the welded joints. As a result of this process, some dangerous zones of acting voltages concentration are formed. These conclusions predetermine the need to identify some certain zones that concentrate stresses in themselves, while it is mandatory to strengthen the metal in such zones to standard indicators. An increase in the strength properties of the steel under study is possible by applying cold plastic deformation and subsequent thermal cycling (STC). This is achieved by obtaining a fine-grained metal structure with higher strength. The author defines the welded joints and the zone of its fusion with the base metal and the overheating area as the most dangerous areas subject to loading. To control this process, it is recommended to use the passive fluxgate method in the work, while the fusion zone with the overheating section should be inspected first, and then the weld.Discussion and conclusion. The author comes to the conclusion that the experimental studies carried out can contribute to an increase in the efficiency of the process of reducing the stress concentration (SC) in the elements of construction machines made of steel and subjected to intensive operation by reducing the structural and mechanical inhomogeneity of welded joints. |
| format | Article |
| id | doaj-art-ec28065b25e543d58b7a19d52184fbb6 |
| institution | Matheson Library |
| issn | 2071-7296 2658-5626 |
| language | Russian |
| publishDate | 2020-12-01 |
| publisher | Siberian State Automobile and Highway University |
| record_format | Article |
| series | Вестник СибАДИ |
| spelling | doaj-art-ec28065b25e543d58b7a19d52184fbb62025-08-04T10:17:45ZrusSiberian State Automobile and Highway UniversityВестник СибАДИ2071-72962658-56262020-12-0117666467510.26518/2071-7296-2020-17-6-665-675652Experimental studies of heat treatment influence on the welded connections properties in working mechanisms of road buildingA. Р. Scherbakov0Federal State Budgetary Educational Institution of Higher Education Saint Petersburg State University of Architecture and Civil EngineeringIntroduction. The experimental studies of the heat treatment effect on the properties of welded joints in working mechanisms of road-building machines are carried out in the work. Studying the structures of the metal itself, as well as welded joints and considering their heterogeneity, the author analyzes the strength characteristics of these objects.Materials and methods. By means of metallographic analysis, as well as using boron-containing steel 30MnB5, which is used for the manufacture of structures for construction machines, as a research material, the author examined its microstructure, which took place in certain zones of welded joints. In particular, welded jointss, fusion zones with an overheating area, a complete recrystallization area and the base metal were studied. We also studied the features of cold plastic deformation of the specified steel sample.Results. It was determined that the mechanical inhomogeneity of the steel at these joints is the cause of the structural inhomogeneity of the welded joints. As a result of this process, some dangerous zones of acting voltages concentration are formed. These conclusions predetermine the need to identify some certain zones that concentrate stresses in themselves, while it is mandatory to strengthen the metal in such zones to standard indicators. An increase in the strength properties of the steel under study is possible by applying cold plastic deformation and subsequent thermal cycling (STC). This is achieved by obtaining a fine-grained metal structure with higher strength. The author defines the welded joints and the zone of its fusion with the base metal and the overheating area as the most dangerous areas subject to loading. To control this process, it is recommended to use the passive fluxgate method in the work, while the fusion zone with the overheating section should be inspected first, and then the weld.Discussion and conclusion. The author comes to the conclusion that the experimental studies carried out can contribute to an increase in the efficiency of the process of reducing the stress concentration (SC) in the elements of construction machines made of steel and subjected to intensive operation by reducing the structural and mechanical inhomogeneity of welded joints.https://vestnik.sibadi.org/jour/article/view/1165metallographic analysiswelded metal structureswelded jointsstress concentration zones |
| spellingShingle | A. Р. Scherbakov Experimental studies of heat treatment influence on the welded connections properties in working mechanisms of road building Вестник СибАДИ metallographic analysis welded metal structures welded joints stress concentration zones |
| title | Experimental studies of heat treatment influence on the welded connections properties in working mechanisms of road building |
| title_full | Experimental studies of heat treatment influence on the welded connections properties in working mechanisms of road building |
| title_fullStr | Experimental studies of heat treatment influence on the welded connections properties in working mechanisms of road building |
| title_full_unstemmed | Experimental studies of heat treatment influence on the welded connections properties in working mechanisms of road building |
| title_short | Experimental studies of heat treatment influence on the welded connections properties in working mechanisms of road building |
| title_sort | experimental studies of heat treatment influence on the welded connections properties in working mechanisms of road building |
| topic | metallographic analysis welded metal structures welded joints stress concentration zones |
| url | https://vestnik.sibadi.org/jour/article/view/1165 |
| work_keys_str_mv | AT arscherbakov experimentalstudiesofheattreatmentinfluenceontheweldedconnectionspropertiesinworkingmechanismsofroadbuilding |