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1
Content available remote Analysis of the technological process of rings of train wheels
100%
Topolska S.
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tom Vol. 17, nr 1-2
405--408
EN
Purpose: The aim of this paper is to show the analysis of a specific process of manufacturing the rings of train wheels. Secondly this work presents the exemplars of possible faults in this technology. Design/methodology/approach: The presented work bases on the investigations made in chosen manufacturing plant. Also laboratory tests have been made to point the discovered problems. Findings: Results show that it is important to apply in modern manufacturing processes the system of monitoring. Also it helps to establish the continuous quality assurance system. Moreover it is proved that quality system must cooperate with the training system. Research limitations/implications: The presented elaboration includes results from one manufacturing plant. It is consider with the fact that this production process is rare so it is difficult to receive comparative data. Secondly, the limitation of this work is the commercial secret. Some specific parameters of presented process are secret. Also the name of manufacturing plant is omitted. Practical implications: The implication of the work could be found in two remarks. Firstly it is important to introduce to the industry practice the integrated approach. Secondly the human and technical factors are equally important. Originality/value: The value of this work is its subject. In this work a very rare technological process is presented. Secondly, in this work it is presented the analysis of quality parameters of this process. Also are proposed the general solutions of same faults.
2
Content available remote Quality control in the process of rings of train wheels manufacturing
100%
Topolska S.
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tom Vol. 31, nr 2
712-718
EN
Purpose: The paper presents an example of the application of the complex quality control process and shows the advantages of such approach. Moreover it presents the analysis of a specific manufacturing process of rings of train wheels. Design/methodology/approach: In the presented works it has been presented a holistic approach to the process engineering. The investigations in the manufacturing plant and laboratory test allow showing the results of a complex quality control. Findings: Results confirm the importance of the new process engineering which links the traditional approach with the modern quality control. Also it proves that the quality control system must cooperate with the training system. Research limitations/implications: The investigation area has been limited to one industry plant. It was considered with the fact that the analyzed process is a much specified one. This situation doesn't make possible to compare results with the other data. The second limitation is considered with the commercial secret (some data is omitted). Practical implications: First main practical results could be described as elaborating the methodology of quality assurance of the specific and rare manufacturing processes. Secondly the paper shows how to link the technical and human factors in one integrated process. Originality/value: Firstly this paper presents the analysis of a very rare manufacturing process what is valuable of both scientific and educational points of view. Secondly it shows how to organize the rare production process with a complex quality control.
3
Content available remote The role of quality control operations in a process of plastic forming
100%
Topolska S.
Journal of Achievements in Materials and Manufacturing Engineering
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2007
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tom Vol. 23, nr 2
95-98
EN
Purpose: The aim of this paper is present the role of quality control operations in such a complex manufacturing process like plastic forming. Nowadays classical manufacturing process management is replaced with total quality management philosophy. Design/methodology/approach: The presented results base on the investigations conducted in manufacturing plants of heavy industry. Next the results of researches have been compared with requirements of quality standards. Findings: Results obtained in the work point the importance of a system of continuous quality monitoring and of quality control operations. Moreover the improvement in quality management is directly related with the corporate image. Research limitations/implications: The presented results base on the analysis of manufacturing processes of steel mills and are considered with the process of plastic forming and related processes. It must be stated that some technological parameters are confidential. Practical implications: The practical implication of the work is considered with the proposal of a scheme of quality control operations in a manufacturing process of plastic forming. This scheme could be used as a remark showing the proper manufacturing process planning. Originality/value: The work presents the analysis of manufacturing processes for heavy industry according the quality assessment what is rather a lateral problem in quality analysis.
4
Content available remote The role of finishing, operations in a tube plastic forming process
100%
Topolska S.
Advances in Materials Science
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2007
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tom Vol. 7, nr 2(12)
327-333
EN
The paper presents the analysis of the role of fnishing operations in a process of plastic forming, The quality level in plastic forming is strongly related with the quality level of finishing operations, These operations ale different for various plastic forming processes, In this paper the pipe manufacturing process bas been chosen as an example of the plastic forming process, The base technological operations are: rolling and welding, But the main technological operations ale considered in the connection to finishing process, They mainly influence the quality image of a producer. During these operations it is possible to diagnose and correct a lot of manufacturing faults and prepare the product for dispatching, The in finishing operations ale: machining, cleaning and checking.
5
Content available remote Effect of microstructure on impact toughness of duplex and superduplex stainless steels
63%
Topolska S. , Łabanowski J.
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tom Vol. 36, nr 2
142-149
EN
Purpose: of this paper is to study the effect of heat treatments and resulting changes in microstructure on mechanical properties, mainly impact toughness, of commercial 2205 duplex stainless steel and higher alloy superduplex 2507 grade. Design/methodology/approach: Both steels were submitted to ageing treatments in the temperature range of 500-900 °C with exposure time periods 6 minutes, 1 hour and 10 hours. Light microscope examinations, hardness measurements and impact toughness tests were performed in order to reveal microstructure and changes in mechanical properties. Findings: Obtained results confirm that high temperature service of duplex stainless steels should be avoided. Precipitations of secondary phases (mainly ó phase) strongly deteriorate mechanical properties of steels but some amounts of these phases could be acceptable in the microstructure depending upon the application of the steel. Research limitations/implications: Presence of secondary phases in duplex stainless steel microstructure can be very harmful for its corrosion resistance. This phenomenon is not considered in this study. Practical implications: The accidents during exploitation and errors in processing of duplex stainless steels can result in undesired temperature growth over 500°C. Such events brings question whether the steel can be still exploited or not. The aim of present study is to reveal the effect of thermal cycles on structural changes and mechanical properties of duplex stainless steel and establish the highest acceptable time-temperature conditions for safe operation of the steel. Originality/value: Information available in literature does not clearly indicate what amount of secondary phases existing in duplex stainless steel microstructure can be acceptable. The current study shows that duplex 2205 steel affected by thermal cycles and containing about 10% of sigma phase still exhibit acceptable mechanical properties.
6
Content available remote The visualisation of manufacturing process of pipes welding
63%
Topolska S. , Szewieczek D.
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tom Vol. 20, nr 1-2
575-578
EN
Purpose: The aim of this paper is to show the concept of application the visualization technique for educational aims. This approach allows enriching a didactic process. Also this technique could help in solving problems consider with analyzing the manufacturing processes. Design/methodology/approach: The presented work bases on the application of computer visualization techniques for elaboration the presentation of chosen manufacturing processes. The computer visualization has been based on films captured in the manufacturing plant. Findings: The main result of this work is the proposal of the methodology of preparing visualization approach. It has been propose some remarks relating to this methodology. Research limitations/implications: The presented elaboration bases on one chosen manufacturing process. As an exemplar it was chosen the process of pressure welding of pipes with currents of high frequency. So the presented process links two main manufacturing processes: The welding technology and the plastic forming. Practical implications: The implication of the work could be found in two remarks. Firstly it is important to introduce to the industry practice the visualization approach as more didactic and which allows omitting some faults generated in a conventional approaches. Secondly this approach could enrich the scope of approaches offered by educational platforms in e-learning systems. Originalityvalue: The value of this work is its subject. In this work a new educational approach is presented. Secondly, in this work it is presented the analysis of preparing the visualization of a manufacture process. Also some solutions in this area are included.
7
Content available remote Corrosion of evaporator tubes in low emission steam boilers
63%
Topolska S. , Łabanowski J.
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tom Vol. 42, nr 2
85-92
EN
Purpose: of this paper is to reveal the mechanisms of corrosion processes of outer surfaces of low-emission steam boiler evaporator tubes. Examinations were performed to find the reasons of different corrosion susceptibility of tubes situated at combustion chamber on various levels. Design/methodology/approach: Examinations were conducted on several segments of Ø 57 x 5.0 mm evaporator tubes made of 16M (16Mo3) steel grade. Segments were taken from level of 10 meters and 18 meters from the chamber bottom of low-emission coal fired steam boiler after two years operation. Microstructure degradation of base material was estimated. Metallographic evaluation of scale morphology, its micro sites chemical composition analysis and distribution of elements on cross sections have been performed. Findings: Eexaminations of evaporator tubes indicated that reduction of wall thickness was considerable at the segments taken from level of 10 m, when at level of 18 m this reduction was small. The morphology of scales consisted of external layer which was porous and weakly connected to the tube surface, and internal layer, which was dense and adherent to the base metal. In these two layers the bands reach in sulfur were detected. The sulfide corrosion seems to be the main degradation mechanism of the tube surface at the level of 10 m. Research limitations/implications: Corrosion of the water wall tubes in low-emission steam boilers is a result of reaction of steel tube surface with the aggressive substoichiometric environment contains sulfur. The chemical composition of flue gases changes along the water wall. The exact compound of flue gases has not been determined in this study. Practical implications: Prevention of water wall tubes corrosion can be achieved by changing in operation conditions or replacement of tube materials. The first mentioned action is limited to accurate burner's adjustment or introduces a flow of additional air along the walls and create air curtain between reducing environment and tubes surface. These efforts often are insufficient. The replacement of more corrosion resistant material on Cr rich steel or Cr-Ni steel is possible but other problems appear connected with high costs of installation and low heat transfer coefficients of such materials. Knowing the mechanisms of corrosion allows adjusting combustion process at low emission steam boilers. Originality/value: Information available in literature does not clearly indicate what mechanism of corrosion is dominant at different parts of combustion chamber. The current study shows which corrosion mechanisms are the most dangerous for evaporator tubes.
8
Content available Assessment of gold with titanium alloy weldability in conditions of a dental technique laboratory
51%
Jania G. , Żmudzki J. , Topolska S.
Archives of Materials Science and Engineering
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2022
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tom Vol. 118, nr 1
36--41
EN
Purpose: In dental practice, there is necessary to weld gold with titanium under the conditions of a dental technique laboratory, which is difficult. The aim was to assess the weldability of pure gold with the titanium alloy Ti6Al4V using a prosthetic laser welding machine. Design/methodology/approach: Gold wire in a diameter of 0.4 mm made with the use of a jewellery drawbar (GOLDPORT, Szczecin, Poland) was welded to a titanium alloy Ti6Al4V substrate of dental implant abutment screw (MegaGen). Dental laser welding parameters (Bego Laser Star T plus) were 230 V; 6.5 ms; 2.5 Hz; laser spot 0.3 mm, and argon blow. Samples were included in resin, ground (500-4000 SiC), polished (Al2O3 suspension) and etched (Kroll solution) per 20 s before observation under a light microscope. Findings: There were well-welded and poorly joined zones. The discontinuities and voids there were not visible or sparse next to the initial weld point. Dendritic structure at well-welded remelting zones and two-phase microstructure of titanium and Ti3Au phase were found. The heat-affected zone was about of 20 microns. Research limitations/implications: Light microscopy was used, and precise phase identification required further investigations. Weld strength assessment requires further micro-hardness and load-bearing ability tests. Weldability concerns the model system with pure gold. Practical implications: In the case of elements with dimensions below 0.4 mm, the use of a laser with a smaller spot should be considered for better control of the remelting zone and mechanical positioning of the elements in order to stabilize and avoid discontinuities and voids. Originality/value: Prosthetic laser welding with a laser spot about of 0.3 mm allows to obtain well-welded parts of 0.3 mm in diameter under stable stitching conditions and higher than 0.4 mm in dimensions.
9
Content available remote High temperature corrosion of evaporator tubes in low-emission steam boilers
51%
Łabanowski J. , Ćwiek J. , Topolska S.
Advances in Materials Science
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2007
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tom Vol. 7, nr 2(12)
26-31
EN
Degradation examinations of outer surface of evaporator tubes of the OP-230 low-emission steam boiler are presented in the paper. Metallographic evaluation of scale morphology, its micro sites chemical composition analysis and linear distribution of elements on cross sections have been performed. Evaluation of chemical compounds existed in deposited layer was also in-vestigated. Sulfide corrosion bas been aimed as the main reason of premature thinning of evaporator tube walls at lower levels of combustion chamber, and molten salt corrosion at highest levels.
10
Content available The effect of long-term service at elevated temperatures on structure and mechanical properties of Cr-Mo-V steel
32%
Ćwiek J. , Łabanowski J. , Topolska S.
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