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Tytuł:
Welding of Thermomechanically Rolled Steel by Yb:YAG Disk Laser
Spawanie stali walcowanej termomechanicznie laserem dyskowym Yb:YAG
Autorzy:
Lisiecki, A.
Powiązania:
https://bibliotekanauki.pl/articles/350965.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
thermomechanically rolled steel
welding
disk laser
walcowanie termomechaniczne
spawanie
laser dyskowy
Opis:
Autogenous laser welding of 5.0 mm thick butt joints of thermomechanically rolled steel S700MC was investigated. The Yb:YAG disk laser TruDisk 3302 emitted at 1.03 μm was used for the trials of autogenous welding. The effect of laser welding parameters and thus thermal conditions of welding on weld shape, microstructure of weld metal and heat affected zone (HAZ), tensile strength, bending angle, impact toughness and microhardness profile was determined. Studies have shown that it is advantageous to provide a high welding speed and low heat input. High cooling rate of weld metal and HAZ leads to the formation of a favorable structure characterized by a large proportion of fine-grained acicular ferrite and provides high mechanical properties of butt joints.
W artykule opisano wyniki badań procesu spawania laserowego bez materiału dodatkowego złączy doczołowych o grubości 5.0 mm ze stali walcowanej termomechanicznie S700MC. Próby spawania wykonano za pomocą lasera dyskowego Yb:YAG TruDisk 3302, który emituje promieniowanie o długości fali 1.03 μm. Badano wpływ parametrów spawania laserowego, a głównie warunków cieplnych procesu spawania na kształt ściegu spoiny, mikrostrukturę metalu spoiny i strefy wpływu ciepła (SWC), wytrzymałość na rozciąganie, kąt gięcia, udarność oraz rozkład mikrotwardości. Wyniki badań wskazują, że korzystne jest zapewnienie dużej prędkości spawania przy jednocześnie niskiej energii liniowej spawania. Duże szybkości stygnięcia metalu spoiny i SWC prowadzą do utworzenia korzystnej drobnoziarnistej struktury o dużym udziale ferrytu drobno płytkowego, co zapewnia wysokie właściwości mechaniczne złączy doczołowych.
Źródło:
Archives of Metallurgy and Materials; 2015, 60, 4; 2851-2860
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Heat Input During Disk Laser Bead-On-Plate Welding of Thermomechanically Rolled Steel on Penetration Characteristics and Porosity Formation in the Weld Metal
Autorzy:
Lisiecki, A.
Powiązania:
https://bibliotekanauki.pl/articles/958220.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
disk laser
welding
thermomechanically rolled steel
Opis:
The paper presents a detailed analysis of the influence of heat input during laser bead-on-plate welding of 5.0 mm thick plates of S700MC steel by modern Disk laser on the mechanism of steel penetration, shape and depth of penetration, and also on tendency to weld porosity formation. Based on the investigations performed in a wide range of laser welding parameters the relationship between laser power and welding speed, thus heat input, required for full penetration was determined. Additionally the relationship between the laser welding parameters and weld quality was determined.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 1; 93-102
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of Titanium Metal Matrix Composite Surface Layers Produced During Laser Gas Nitriding of Ti6Al4V Alloy by Different Types of Lasers
Autorzy:
Lisiecki, A.
Powiązania:
https://bibliotekanauki.pl/articles/351670.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
titanium alloys
laser gas nitriding
composite surface layer
disk laser
diode laser
Opis:
The article presents the results of a comparative study of the nitriding process of titanium alloy substrate using two lasers with different characteristics of laser beams. One of the applied lasers was a high power diode laser emitting at a dominant wavelength of 808 nm, with a rectangular laser beam spot, and multimode energy distribution across the spot. The second laser was a solid state Yb:YAG disk laser emitting at a wavelength of 1.03 μm, with a circular beam spot, characterized by near Gaussian energy distribution across the spot. In a case of both lasers single stringer beads with a similar width and at similar energy input were produced. As a result of melting of the substrate with a laser beam in a pure gaseous nitrogen atmosphere composite surface layers with in situ precipitated titanium nitrides embedded in the metallic matrix of titanium alloy were produced, in both cases. However, the surface topography and structure is different for the surface layers produce by different lasers at the same processing parameters and width of laser beams.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 4; 1777-1784
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Welding of Thermomechanically Rolled Fine-Grain Steel by Different Types of Lasers
Spawanie stali drobnoziarnistej walcowanej termomechanicznie laserami różnego typu
Autorzy:
Lisiecki, A.
Powiązania:
https://bibliotekanauki.pl/articles/355444.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
laser
welding
keyhole
thermomechanically rolled steel
fine grain steel
spawanie
oczko spoiny
walcowanie termomechaniczne
stal drobnoziarnista
Opis:
The autogenous laser welding of 2.5 mm thick butt joints of thermomechanically rolled fine-grain steel grade S420MC was investigated. Butt joints were laser welded by the Yb:YAG Disk laser, emitted a circular laser beam with spot diameter of 200 μm at 1.03 μm wavelength, and also by the high power direct diode laser, emitted a rectangular beam with dimension of 1.8x6.8 mm at 808 nm wavelength. Different welding modes were identified for the lasers applied. The conduction welding mode was observed in whole of the diode laser welding parameters. While high quality joints, without any internal defects and characterized with satisfactory mechanical performance were produced in a wide range of parameters. The butt joints produced by Disk laser were welded at keyhole mode. In this case a slight tendency to weld porosity was found.
W artykule przedstawiono wyniki badań procesu spawania laserowego bez materiału dodatkowego złączy doczołowych ze stali drobnoziarnistej walcowanej termomechanicznie S420MC. Złącza doczołowe spawano laserowe za pomocą lasera dyskowego Yb:YAG, który emituje wiązkę laserową o przekroju kołowym i średnicy ogniska 200 μm przy długości fali promieniowania laserowego 1.03 μm, jak również za pomocą lasera diodowego dużej mocy o prostokatnym kształcie ogniska i długości fali 808 nm. Badania wykazały, że mechanizmy i techniki spawania zastosowanymi laserami są odmienne. W przypadku lasera diodowego w całym zakresie parametrów spawanie odbywało się z utworzeniem jeziorka spoiny. Złącza próbne spawane w szerokim zakresie parametrów charakteryzowały się wysoką jakością, brakiem wad wewnętrznych i wysokimi właściwościami mechanicznymi. Z kolei zastosowanie lasera dyskowego spowodowało, że złącza doczołowe były spawane z utworzeniem kanału parowego, tzw. oczka spoiny. W tym przypadku stwierdzono jednak nieznaczną skłonność do porowatości spoin.
Źródło:
Archives of Metallurgy and Materials; 2014, 59, 4; 1625-1631
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tribological Characteristic of Titanium Alloy Surface Layers Produced by Diode Laser Gas Nitriding
Autorzy:
Lisiecki, A.
Piwnik, J.
Powiązania:
https://bibliotekanauki.pl/articles/351668.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
titanium alloys
laser gas nitriding
surface layer
wear resistance
ball-on-disk
Opis:
In order to improve the tribological properties of titanium alloy Ti6Al4V composite surface layers Ti/TiN were produced during laser surface gas nitriding by means of a novel high power direct diode laser with unique characteristics of the laser beam and a rectangular beam spot. Microstructure, surface topography and microhardness distribution across the surface layers were analyzed. Ball-on-disk tests were performed to evaluate and compare the wear and friction characteristics of surface layers nitrided at different process parameters, base metal of titanium alloy Ti6Al4V and also the commercially pure titanium. Results showed that under dry sliding condition the commercially pure titanium samples have the highest coefficient of friction about 0.45, compared to 0.36 of titanium alloy Ti6Al4V and 0.1-0.13 in a case of the laser gas nitrided surface layers. The volume loss of Ti6Al4V samples under such conditions is twice lower than in a case of pure titanium. On the other hand the composite surface layer characterized by the highest wear resistance showed almost 21 times lower volume loss during the ball-on-disk test, compared to Ti6Al4V samples.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 2A; 543-552
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Laser welding of stainless steel
Autorzy:
Kurc-Lisiecka, A.
Lisiecki, A.
Powiązania:
https://bibliotekanauki.pl/articles/368297.pdf
Data publikacji:
2020
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
laser welding
AISI 304 steel
high power diode laser
HPDL
spawanie laserowe
stal AISI 304
laser diodowy dużej mocy
Opis:
Purpose: of this paper was to analyze the influence of the basic parameters of laser welding (i.e. laser beam power and welding speed, as well as energy input) of butt joints of the 2.0 mm thick stainless steel AISI 304 sheets on the weld shape and joint quality. Design/methodology/approach: The preliminary trials of simulated laser welding by melting the austenitic stainless steel sheets (the so called bead-on-plate welding), as well as the welding of the test butt joints, were carried out using the high-power diode laser (HPDL) ROFIN DL 020, without the additional material (the technique of autogenous welding). A crucial parameter that determines both the mechanical properties and the corrosive resistance of a joint (the region of a weld and HAZ - heat affected zone) in the case of stainless steels with austenitic structure is energy input, which should be kept at a minimum, and at the same time full penetration and a proper shape of the fusion zone should be ensured. The investigations included the macrostructure and microstructure observations by light microscopy, researches of mechanical properties in a static tensile test and also microhardness measurements made by Vickers method. Findings: The results have shown that it is possible to provide a proper shape of the weld of fine-grained structure and narrow heat affected zone, but it requires careful selection of the welding parameters, especially a low energy input. The microhardness measurements showed that the in case of welding the butt joints using the high-power diode laser in HAZ area a slight increase in microhardness to approx. 185HV0.2 compared to base material (160-169HV0.2) and a decrease in microhardness in the fusion zone (FZ) to approx. 140- 150HV0.2 have been observed. All welded sample broke from the joint during the testing at tensile stress between 585 MPa and 605 MPa with corresponding percentage elongation in the range of 45-57%. It can be found that the joints strength is not less than the strength of the base metal of 2.0 mm thick AISI 304 austenitic stainless steel sheet. Research limitations/implications: Studies of the weldability of stainless steels indicate that the basic influence on the quality of welded joints and reduction of thermal distortions has the heat input of welding, moreover the highest quality of welded joints of austenitic stainless steel sheets are ensured only by laser welding. Practical implications: The laser welding technology can be directly applied for welding of austenitic steel AISI 304 sheets 2.0 mm thick. Originality/value: Application of high power diode laser for welding of austenitic stainless steel AISI 304.
Źródło:
Journal of Achievements in Materials and Manufacturing Engineering; 2020, 98, 1; 32-40
1734-8412
Pojawia się w:
Journal of Achievements in Materials and Manufacturing Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Automated Laser Welding of AISI 304 Stainless Steel by Disk Laser
Autorzy:
Lisiecki, A.
Kurc-Lisiecka, A.
Powiązania:
https://bibliotekanauki.pl/articles/354376.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
autogenous laser welding
butt joints
stainless steel
AISI 304
austenitic steel
Opis:
The automated laser welding process of 2.0 mm thick sheets of AISI 304 stainless steel was investigated. The disk laser with a beam spot diameter of 200 μm was used for bead-on-plate and next for autogenous butt joints welding. The influence of basic welding parameters such as laser power, welding speed, and focal spot position on fusion zone configuration, quality of joints, microstructure changes, and microhardness distribution across the joints were analysed and presented in this paper. The results have shown that stiffening of the 2.0 mm thick sheets is crucial for providing high quality and reproducibility of butt joint in a case of AISI 304 stainless steel due to relatively low thermal conductivity and simultaneously high thermal expansion. Relevant drop of microhardness in the weld zone was observed. The mean value of microhardness of the base metal was 230 HV0.1, while the microhardness in fusion zone of the test welds was ranged from 130 to 170 HV0.1. Additionally the microstructure changes in the weld metal and also in the heat affected zone of test joints is described.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 4; 1663-1672
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Laser cladding of Co-based metallic powder at cryogenic conditions
Autorzy:
Lisiecki, A.
Ślizak, D.
Kukofka, A.
Powiązania:
https://bibliotekanauki.pl/articles/367880.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
laser cladding
cobalt-based powder
cryogenic conditions
forced cooling
napawanie laserowe
proszek na bazie kobaltu
warunki kriogeniczne
chłodzenie
Opis:
Purpose: of this paper was demonstration a novel technique of laser cladding by experimentally composed Co-based metallic powder and forced cooling of the substrate by liquid nitrogen under cryogenic conditions, at the temperature -190°C, for producing clad layers with enhanced microstructure characteristic and properties. Design/methodology/approach: Technological tests of laser cladding were conducted by means of a high power fibre laser HPFL with maximum output power 3.0 kW, and six-axis robot. The experimental Co-based powder was composed for providing high abrasive wear resistance, high resistance for impact load, and also for corrosion resistance at elevated temperature. The unique and novel technique of forced cooling of the substrate was provided by immersing the specimens in the liquid nitrogen bath. The three coaxial nozzle head was designed and custom made to provide precise deposition of the powder delivered into the laser beam irradiation region. The scope of the study included tests of conventional laser cladding at free cooling in ambient air in a wide range of processing parameters, and also trials of laser cladding under cryogenic conditions. The test clad layers produced by conventional laser cladding and by the novel technique of laser powder deposition under cryogenic conditions were investigated and compared. Findings: The obtained results indicate that the novel technique of forced cooling the substrate by liquid nitrogen bath provides lower penetration depth, as well as low dilution of the clad, and also provides higher hardness of the clads. Additionally, it is possible shaping the geometry of the individual bead, providing high reinforcement and low width. Research limitations/implications: The presented results are based just on preliminary test of the novel technique of laser cladding under cryogenic conditions. Therefore, further study and detailed analyse of the influence of the cooling rate on the quality, microstructure, and properties of the deposited coatings are required. Practical implications: The study is focused on practical application of the novel technique for manufacturing of wear resistance coatings characterised with enhanced performance compared to conventional range of application of the laser cladding. Originality/value: Novel technique of laser cladding at forced cooling under cryogenic conditions was demonstrated. The powder used for cladding trials was experimentally composed (not commercially available). The experimental stand custom made was used with custom made powder feeding rate, and also with custom made coaxial nozzle head.
Źródło:
Journal of Achievements in Materials and Manufacturing Engineering; 2019, 95, 1; 20-31
1734-8412
Pojawia się w:
Journal of Achievements in Materials and Manufacturing Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Laser Welding of New Grade of Advanced High Strength Steel STRENX 1100 MC
Autorzy:
Kurc-Lisiecka, A.
Piwnik, J.
Lisiecki, A.
Powiązania:
https://bibliotekanauki.pl/articles/351943.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
laser welding
disk laser
fine-grain steel
butt joint
Opis:
The article presents results of investigations on autogenous laser welding of new grade STRENX 1100 MC steel. The modern Disk laser was applied for of 5.0 mm thick butt joints welding. The influence of laser welding parameters, mainly the energy input of laser welding on the penetration shape, weld quality, structure and mechanical performance was investigated. It was found that the investigated steel has surprisingly low carbon equivalent CET just 0.328, and also relatively high temperature of martensitic transformation Ms at 430.6°C. Despite very rapid cooling times t8/5 in a range from 0.6 to 1.3 s, thus rapid solidification there was no tendency to cracking of weld metal or HAZ. Significant drop of microhardness in the HAZ resulted in a decrease of tensile strength of joints, compared to the base metal. Impact toughness of test joints was at only 50÷60% of the base metal.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 3; 1651-1657
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on Influence of Fatigue Metal Damage of the Inner Race of Bearing on Vibration in Different Frequencies
Badania wpływu uszkodzeń na skutek zmęczenia materiału bieżni wewnętrznej łożyska na drgania w różnych częstotliwościach
Autorzy:
Burdzik, R.
Węgrzyn, T.
Konieczny, Ł.
Lisiecki, A.
Powiązania:
https://bibliotekanauki.pl/articles/351384.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
vibration propagation in materials
material properties
vibroacoustics
wear of ball bearing
propagacja drgań w materiałach
właściwości materiałowe
wibroakustyka
zużycie łożyska
Opis:
The paper presents results of research on influence of fatigue metal damage of the inner race of bearing on vibration in different frequencies. The active diagnostics experiments were conducted on application of vibroacoustics methods for technical condition monitoring. Provides an overview of materials and process analysis of rolling bearings wear. The bearing damage of the inner race have been simulating. The research was conducted on special research-educational test bench for vibration monitoring for rotaring machinery. For the identification of the symptoms of the defects in the vibration signal the analysis of time realization and frequency transformation of the vibration have been conducted. For the comparison of the vibration of good and damage bearings signals registered for different frequencies have been presented in form of spectrograms and RMS distributions.
W ramach artykułu przedstawiono wyniki badań wpływu uszkodzeń powstałych na skutek zmęczenia materiału bieżni wewnętrznej łożyska na drgania w różnych częstotliwościach. Przeprowadzono szereg czynnych eksperymentów z wykorzystaniem metod wibroakustycznych do monitorowania stanu technicznego maszyny. Przedstawiono przegląd materiałów oraz analizę procesów zużycia łożysk tocznych. Eksperyment przeprowadzono dla uszkodzenia bieżni wewnętrznej łożyska. Badania przeprowadzono na specjalnym stanowisku badawczo-edukacyjnym - maszyny wirującej z monitoringiem drgań. W celu identyfikacji objawów uszkodzeń, sygnały drganiowe poddano analizie w dziedzinie czasu oraz częstotliwości. W celu porównania drgań obudowy dobrego i uszkodzonego łożyska zarejestrowane sygnały dla kolejnych badanych częstotliwości przedstawiono w formie spektrogramów i rozkładów wartości RMS.
Źródło:
Archives of Metallurgy and Materials; 2014, 59, 4; 1275-1281
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 43

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