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Wyszukujesz frazę "shielding gas" wg kryterium: Temat


Wyświetlanie 1-8 z 8
Tytuł:
The effect of shielding gas composition on microstructure and abrasive wear resistance fabricated with PTA alloying technique
Wpływ składu gazu osłonowego na mikrostrukturę i odporność na ścieranie powłok wytworzonych techniką PTA
Autorzy:
Çay, V. V.
Ozan, S.
Gök, M. S.
Erdoğan, A.
Powiązania:
https://bibliotekanauki.pl/articles/353308.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
surface modification
shielding gas
PTA
alloying
microstructure
modyfikacja powierzchni
gaz ochronny
stopy
mikrostruktura
Opis:
In this study, SAE 1020 steel surfaces were separately alloyed with preplaced high-carbon-ferro-chromium (FeCr), ferro-molybdenum (FeMo) and ferro-titanium (FeTi) powders by using plasma transferred arc (PTA) heat source. By using three different types of shielding gas compositions during the alloying process, the study investigated the effects of modified shielding gas composition on the microstructure, hardness, and abrasive wear resistance of specimens. The most homogenous microstructure and the highest wear resistance was obtained in the gaseous environment which included 3% of H2. Increasing this rate to 5 % in the shielding gaseous composition caused gaps and pores in the microstructure and caused a decrease in the wear resistance. The x-ray examinations of the specimens identified ferro-molybdenum and ferro-titanium solid solutions, ferrit, austenite and martensite phases in their microstructure as the first phase and FeC, Cr7C3, Cr3C2, Fe3C, Fe7C3, MoC and TiC phases as the second phase. As a result, it was concluded that changes in shielding gas composition in surface alloying process affected specimens’ microstructure and abrasive wear properties.
Powierzchnie stalowe SAE 1020 były oddzielnie stopowane z wcześniej nałożonymi proszkami wysokowęglowego żelazo-chromu (FeCr), żelazo-molibdenu (FeMo) i żelazo-tytanu (FeTi) za pomocą techniki PTA. Dzięki zastosowaniu trzech różnych typów gazu osłonowego w trakcie procesu wytwarzania stopu, badano wpływ modyfikacji składu gazu osłonowego na mikro- strukturę, twardość i odporność na ścieranie próbek. Najbardziej jednorodną mikrostrukturę i najwyższą odporność na ścieranie otrzymuje się w środowisku gazowym, które zawiera 3% H2. Zwiększenie zawartości H2 do 5% w składzie gazu osłonowego spowodowało powstanie luk i porów w mikrostrukturze oraz spadek odporności na ścieranie. Badania dyfrakcji rentgenowskiej próbek pozwoliły zidentyfikować roztwory stałe żelazo-molibdenu i żelazo-tytanu, ferryt, austenit i martenzyt jako pierwszą fazę w ich mikrostrukturze, oraz FeC, Cr7C3, Cr3C2, Fe3C, Fe7C3, MoC i TiC jako drugą fazę. W związku z tym stwierdzono, że zmiany w składu gazu osłonowego w procesie stopowania wpłynęły na mikrostrukturę próbek i właściwości ścierne.
Źródło:
Archives of Metallurgy and Materials; 2013, 58, 4; 1137-1145
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Terminal LNG w Świnoujściu na finiszu
The Świnoujście LNG terminal about to be completed
Autorzy:
Kowacki, M.
Powiązania:
https://bibliotekanauki.pl/articles/364767.pdf
Data publikacji:
2014
Wydawca:
Nowoczesne Budownictwo Inżynieryjne
Tematy:
terminal LNG
Świnoujście
gaz ziemny
falochron osłonowy
parametry
LNG terminal
natural gas
breakwater shielding
parameters
Opis:
Budowany w Świnoujściu terminal LNG jest typowym terminalem lądowym – skroplony gaz ziemny jest pompowany z metanowców do zbiorników znajdujących się na lądzie w pobliżu portu. Tam LNG poddawany jest regazyfikacji w instalacjach lądowych, a następnie wtłaczany do systemu gazowniczego. Jak wynika z raportu przedstawionego przez wykonawcę, stan zaawansowania prac wyniósł we wrześniu 2014 r. 93,7%. Inwestycja będzie gotowa do odbioru komercyjnych dostaw gazu w 2015 r.
The Świnoujście LNG terminal currently under construction is a typical land-based terminal - liquefied natural gas is pumped from LNG methane tankers to tanks located on land near the port. LNG is regasified in land-based installations, and then pumped into the gas supply system. According to the report submitted by the contractor, the state of completion in September 2014 reached 93.7%. The project will be ready to receive commercial gas supplies in 2015.
Źródło:
Nowoczesne Budownictwo Inżynieryjne; 2014, 6; 30-33
1734-6681
Pojawia się w:
Nowoczesne Budownictwo Inżynieryjne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The role of shielding gas on mechanical, metallurgical and corrosion properties of corten steel welded joints of Railway Coaches using GMAW
Autorzy:
John, B.
Paulraj, S.
Mathew, J.
Powiązania:
https://bibliotekanauki.pl/articles/103206.pdf
Data publikacji:
2016
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
gas metal arc welding
shielding gas
corrosion
weld microstructure
corten steel
Opis:
This analysis lays emphasis on finding a suitable combination of shielding gas for welding underframe members such as sole bar of Railway Coaches made of corten steel; for improved mechanical, metallurgical and corrosion properties of welds using copper coated solid MIG/MAG welding filler wire size 1.2 mm conforming to AWS/SFA 5.18 ER 70 S in Semi-automatic GMAW process. Solid filler wire is preferred by welders due to less fumes, practically no slag and easy manipulation of welding torch with smooth wire flow during corrosion repair attention, when compared to Flux cored wire. Three joints using Gas metal arc welding (GMAW) with shielding gases viz., Pure CO2, (80% Ar – 20% CO2 ) and (90% Ar – 10% CO2 ) were made from test pieces cut from Sole bar material of Railway Coach. Study of Mechanical properties such as tensile strength, hardness and toughness revealed that welded joint made using shielding gas (80% Ar – 20% CO2 ) has better Mechanical properties compared to the other two shielding gases and comparable to that of Parent metal. Type of Shielding gas used has influence on the chemical composition and macro & micro structures. The Tafel extrapolation study of freshly ground samples in 3.5% NaCl solution revealed that the welded joint made using shielding gas (80% Ar – 20% CO2 ) has also better corrosion resistance which is comparable to the Parent metal as well as similar commercial steels.
Źródło:
Advances in Science and Technology. Research Journal; 2016, 10, 32; 156-168
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Shielding gas effect on the structure of variable polarity GMA weldbrazed joints of galvanised sheets
Autorzy:
Pfeifer, T.
Winiowski, A.
Pikuła, J.
Powiązania:
https://bibliotekanauki.pl/articles/353355.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
arc weldbrazing
variable polarity GMA weldbrazing
weldbrazing of zinc coated sheets
shielding gas effect
weldbraze structure
Opis:
The article presents the course and results of tests aimed to determine the effect of shielding gas on the shape of a weldbraze and on the structure of weldbrazed joints made of thin galvanised sheets. Test joints were made using innovative VP GMA weldbrazing utilising variable current and voltage waveforms. The tests involved the use of 3 types of shielding gases and mixtures, i.e. Ar, Ar + 1% O2 and Ar + 18% CO2, and required macro and microscopic metallographic examination of overlay brazes and weldbrazed joints. The tests conducted have revealed that the use of mixtures containing active gases, and CO2 in particular, increases the heat input of a weldbrazing process, improves the wettability of sheets and the geometry of weldbrazes, yet it also favours greater coat damage in the joining area and causes partial melting of workpieces.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 1; 91-98
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Shielding Gas Composition on Geometry and Austenite Formation in Low Power Pulsed Nd:YAG Laser Welded 2205 Duplex Stainless Steel
Autorzy:
Gozarganji, Hajibaba, E.
Farnia, A.
Ebrahimnia, M.
Powiązania:
https://bibliotekanauki.pl/articles/2049428.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
low power pulsed Nd:YAG laser welding
duplex stainless steel
shielding gas
nitrogen
austenite formation
Opis:
This paper presents an investigation into effect of nitrogen content of shielding gas mixture on weld geometry, microstructure and hardness of pulsed laser welded 2205 duplex stainless steel. Full penetration autogenous welding was performed on 2 mm thick plates using a low power pulsed Nd: YAG laser. light and scanning electron microscopy were used to study the resulting microstructures. It is observed that 2 mm full penetrated joint decreases to 1.8 mm by dominating nitrogen in argon-nitrogen mixture. Different morphologies of austenite phase as well as an increase of 8% of its content can be observed in pure nitrogen shielded welds. Average weld grain size in sample which is welded in nitrogen atmosphere stands at approximately 41 μm which is smallerthan that of argon atmosphere which is about 51 μm. Micro-hardness test reveals that hardness values increase from 280 HV in base metal to 307 HV in weld center line and the shielding gas mixture does not significantly influence the weld hardness.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 1; 187-195
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation on the Effect of Technological Parameters on Emission Factor in 316L Stainless Steel Using Gas Metal Arc Welding
Autorzy:
Satheesh Kumar, K. V.
Selvakumar, P.
Uvanshankar, K. R.
Thirunavukaras, U. S.
Anand, Vijay V.
Vishal, D.
Powiązania:
https://bibliotekanauki.pl/articles/2049738.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
emission factor
shielding gas
Permissible Exposure Limit
health hazards
glass fiber filter
Opis:
Growing awareness for occupational safety in the welding environment needs a sustainable welding system. Welding gases releases toxic tiny particles and gases that inflict severe health consequences in the weld zone are unsolicited. Some of the other main adverse effects are lung disease, hemoptysis, pulmonary inflammation, pneumoconiosis, etc. GMAW procedure has been used for welding 316L stainless steel plates of 3 mm, 5 mm, and 6 mm. Various current configurations with gas flow rate of 5 LPM, 10 LPM and 15 LPM were also used to achieve optimum butt joint performance and to reduce the production rate of fume contributing to cost-effectiveness. In this research a cost-effective fume extraction hood was fabricated for measuring emission factor produced during welding. Various shielding gas compositions including Pure Argon, Pure CO2, 92% Ar+8% CO2 and 88% Ar+12% CO2were used to determine the best operating parameters in the GMAW method. To satisfy the latest Permissible Exposure Limit (PEL) legislation, optimum technical parameters for efficient welding were acknowledged with the lowest emission factor. A maximum reduction of emission factor can be achieved by using Pure Argon. The inclusion of CO2 as a shielding gas mixture gives higher emission factor when compared to Pure Argon. Very low emission factor were witnessed in this research when compared to previous investigations. Lower emission factor of 2941.17 mg /kg of electrode, 4411.76 mg/kg of electrode and 7352.94 mg/kg of electrode were obtained for pure argon as shielding gas with 150 A welding current.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 2; 609-615
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New concept of gas mixtures for welding high-strength steel S960 MC
Autorzy:
Węgrzyn, Tomasz
Szczucka-Lasota, Bożena
Kurowska-Wilczyńska, Kinga
Doring, Adam
Powiązania:
https://bibliotekanauki.pl/articles/27313712.pdf
Data publikacji:
2022
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
welding process
S960MC steel
means of transport
shielding gas mixture
proces spawania
Stal S960MC
środki transportu
mieszanka gazów osłonowych
Opis:
Purpose: Checking the quality of a joint made with a newly developed method. Design/methodology/approach: A new welding method has been developed in order to obtain a high-quality joint. The properties of the joint were checked by NDT (Non Destructive test) tests and the strength and fatigue strength were tested. Findings: Now, adding to the shielding gas mixture can improve the quality and properties of the weld. Research limitations/implications: In the future, it can be suggested to investigate the effect of nitrogen in other gaseous shielding mixtures of the MAG welding process. Practical implications: The proposed innovation will not cause problems in the production process. Only the shielding gas will be modified without affecting the technological process, management and economic aspects. Social implications: Modifying the welding method will not affect the environment and production management methods. Originality/value: What is new is to propose a new solution with its scientific justification. The article is addressed to manufacturers of structures made of HSS and AHSS steels.
Źródło:
Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska; 2022, 157; 623--629
1641-3466
Pojawia się w:
Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Welding of 690 QL steel for the construction of vehicles and antenna elements
Autorzy:
Węgrzyn, Tomasz
Szczucka-Lasota, Bożena
Döring, Adam
Powiązania:
https://bibliotekanauki.pl/articles/27313608.pdf
Data publikacji:
2022
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
welding
S690 QL
automotive
antenna
shielding gas mixture
spawanie
motoryzacja
antena
mieszanka gazów osłonowych
Opis:
Purpose: The novelty and the aim of the article is to check the possibility of welding high 9 strength steels with a mixture containing 7000 ppm of nitrogen. Design/methodology/approach: A new welding material and method have been developed in order to obtain a high-quality joint for automotive industry and for antenna holders and towers. The properties of the joint were checked by NDT (Non Destructive test) tests and the strength and fatigue were tested. Findings: Relations between process parameters and the quality of welds. Research limitations/implications: In the future, it can be suggested to investigate the effect of micro addition of nitrogen in gaseous shielding mixtures of the MIG/MAG welding process. Practical implications: The proposed innovation will not cause problems in the production process. Only the innovate shielding gas with micro additives will be modified without affecting the technological process, management and economic aspects. Social implications: Modifying the welding method will not affect the environment and production management methods. Originality/value: It is to propose a new solution with its scientific justification. The article is addressed to manufacturers of high-strength steel for automotive industry and to manufacturers of antenna components and instrumentation.
Źródło:
Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska; 2022, 160; 631--638
1641-3466
Pojawia się w:
Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-8 z 8

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