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1
Content available Effect of Cooling Rates and Intermediate Slab Blank Thickness on the Microstructure and Mechanical Properties of the X70 Pipeline Steel
Xu Haijian, Han Chufei, Yan Pingyuan, Zhao Baochun, Li Weijuan
Archives of Metallurgy and Materials
|
2023
|
Vol. 68, iss. 2
649--658
EN
In this study, the microstructures and mechanical properties of X70 pipeline steels produced with varying Mo contents, accelerated cooling rate and intermediate slab blank thickness are systematically investigated. Results showed that the microstructures and mechanical properties of the X70 pipeline steels were strongly affected by Mo addition. The pearlite and proeutectoid ferrite formation is obviously inhibited in containing-Mo steel and the acicular ferrite (AF) is obtained in a wide range of cooling rates. With the increasing the cooling rates, the AF constituent amount increases. The grains can be refined by increasing the thickness of intermediate slab for enhancing the cumulative reduction rates, and meanwhile increase the number density of precipitates. It was proved by simulation and industrial trials that the low-alloy X70 pipeline steels can be produced increasing cooling rates and the thickness of intermediate slab without strength and toughness degradation which also reduce alloy cost.
2
Content available In-Situ Observation of Acicular Ferrite Transformation in High-Strength Low-Alloy Steel Using Confocal Laser Scanning Microscopy
Lee Sang-In, Shin Seung-Hyeok, Park Hyeonwoo, Kim Hansoo, Lee Joonho, Hwang Byoungchul
Archives of Metallurgy and Materials
|
2022
|
Vol. 67, iss. 4
1497--1501
EN
In-situ observation of the transformation behavior of acicular ferrite in high-strength low-alloy steel using confocal laser scanning microscopy was discussed in terms of nucleation and growth. It is found that acicular ferrite nucleated at dislocations and slip bands in deformed austenite grains introduced by hot deformation in the non-recrystallization austenite region, and then proceeded to grow into an austenite grain boundary. According to an ex-situ EBSD analysis, acicular ferrite had an irregular shape morphology, finer grains with sub-grain boundaries, and higher strain values than those of polygonal ferrite. The fraction of acicular ferrite was affected by the deformation condition and increased with increasing the amount of hot deformation in the non-recrystallization austenite region.
3
Content available remote Effect of the shielding gas flow rate on mechanical properties and microstructure of structural steel (IS2062) welds
Rizvi S. A., Tewari S. P.
Mechanics and Mechanical Engineering
|
2017
|
Vol. 21, nr 4
971--984
EN
Structural steel is frequently used for industrial purpose as it is more economical as compared to other steels .In the present research article an attempt has been made to find, how the mechanical properties and microstructure properties of the IS2062 structural steel are affected by the different welding parameters such as shielding gas flow rate, voltage, wire feed speed and welding current. In this research work 75%Ar+25%CO2, is used as shielding gas because it is a best shielding gas mixture for getting a good quality mechanical properties and micro structural properties of welded joint. For study of fracture mode of tensile fracture, SEM test carried out which help to understand the factor influence the microstructure and it is found that the Fractures of tensile samples are brittle in nature which shows the low ductility and brittle fracture. Micro hardness values change throughout weld metal varying by shielding gas flow rate.
4
Gas mixtures based on Ar-He for micro-jet cooling after MAG welding
Szczucka-Lasota B., Gajdzik B., Krzysztoforski M., Węgrzyn T., Hadryś D., Wszołek Ł.
Hutnik, Wiadomości Hutnicze
|
2017
|
Vol. 84, nr 7
262--265
EN
The material selected for this investigation was low alloy weld metal deposit after MAG welding with micro-jet cooling. The present investigation was aimed as the following tasks: obtained WMD with various amount of acicular ferrite in WMD in terms of helium percentage in micro-jet gas mixture. Paper focuses on low alloy steel weld properties after innovate welding method with micro-jet cooling. Weld metal deposit (WMD) for micrograph analyses and impact toughness was carried out for MAG. Until that moment only argon, helium and nitrogen were seriously tested as micro-jet gases. In that paper various gas mixtures (Ar-He) were tested for micro-jet cooling after welding. The influence of oxygen and nitrogen included in gas mixtures based on Ar-He couple on properties of WMD was also tested.
PL
Materiałem wybranym do tego badania było stopiwo uzyskane po spawaniu niestopowej stali procesem MAG z chłodzeniem mikro-jetowym. Badanie miało na celu: otrzymanie stopiwa z różną ilością drobnoziarnistego ferrytu (acicular ferrite) w zależności od zawartości helu w mieszance z argonem stosowanej do schładzania mikro-jetowego. W artykule skoncentrowano się na właściwościach złącza ze stali niestopowej po wprowadzeniu innowacyjnej metody spawania z wykorzystaniem chłodzenia mikro-jetowego. Stopiwo do badań mikrostruktury i udarności było uzyskane po spawaniu procesem MAG. Do tej pory do schładzania mikro-jetowego były dokładnie testowane tylko takie gazy jak argon, hel i azot. W tym artykule badano różne mieszanki gazowe (Ar-He) jako gazy mikro-jetowe. Na własności stopiwa badano również dodatkowy wpływ tlenu i azotu zawartego w mieszankach gazowych opartych na Ar-He.
5
Content available Impact Toughness of Steel WMD after TIG Welding
Węgrzyn T., Piwnik J., Stanik Z., Węgrzyn D., Sieteski D.
Archives of Metallurgy and Materials
|
2017
|
Vol. 62, iss. 3
1647--1650
EN
The material selected for this investigation was low alloy weld metal deposit after TIG welding with various amount of oxygen in weld metal deposit (WMD). After TIG process it is difficult to get proper amount of oxygen in WMD on the level much lower than 350 ppm. The highest impact toughness of low alloy WMD corresponds with the amount of oxygen in WMD above 350 ppm. In the paper focuses on low alloy steel after innovate welding method with micro-jet cooling that could be treated as a chance on rising amount of oxygen in weld. Weld metal deposit (WMD) was carried out for TIG welding with micro-jet cooling with various amount of oxygen in WMD. In that paper various gas mixtures (gas mixtures Ar-O2 and Ar-CO2) were tested for micro-jet cooling after TIG welding. An important role in the interpretation of the results can give methods of artificial intelligence.
6
Content available The use of compressed air for micro-jet cooling after MIG welding
Hadryś D., Węgrzyn T., Piwnik J., Stanik Z., Tarasiuk W.
Archives of Metallurgy and Materials
|
2016
|
Vol. 61, iss. 3
1405--1408
EN
The material selected for this investigation was low alloy steel weld metal deposit (WMD) after MIG welding with micro-jet cooling. The present investigation w*as aimed as the following tasks: obtained WMD with various amount of acicular ferrite and further analyze impact toughness of WMD in terms of acicular ferrite amount in it. Weld metal deposit (WMD) was first time carried out for MIG welding with micro-jet cooling of compressed air and gas mixture of argon and air. Until that moment only argon, helium and nitrogen were tested as micro-jet gases for MIG/MAG processes. An important role in the interpretation of the results can give methods of artificial intelligence.
7
Content available Micro-jet Cooling by Compressed Air after MAG Welding
Węgrzyn T., Piwnik J., Tarasiuk W., Stanik Z., Gabrylewski M.
Archives of Foundry Engineering
|
2016
|
Vol. 16, iss. 2
111--114
EN
The material selected for this investigation was low alloy steel weld metal deposit (WMD) after MAG welding with micro-jet cooling. The present investigation was aimed as the following tasks: analyze impact toughness of WMD in terms of micro-jet cooling parameters. Weld metal deposit (WMD) was first time carried out for MAG welding with micro-jet cooling of compressed air and gas mixture of argon and air. Until that moment only argon, helium and nitrogen and its gas mixture were tested for micro-jet cooling.
8
Content available Możliwość wykorzystania techniki laserowej i mikrojetowej w spawaniu elementów konstrukcji pojazdów
Majewski W.
Zeszyty Naukowe. Transport / Politechnika Śląska
|
2015
|
z. 89
69--78
PL
W artykule zaprezentowano możliwość spawania laserowego z wykorzystaniem chłodzenia mikrostrumieniowego. Przedstawiono wpływ chłodzenia mikrostrumieniowego na strukturę i własności mechaniczne złącza. Analizowano nowy proces spawalniczy pod kątem zastosowania w przemyśle motoryzacyjnym. Badania potwierdziły pozytywny wpływ chłodzenia mikro-strumieniowego zarówno po spawaniu metodą MIG, jak i po spawaniu laserowym.
EN
A paper presents the possibility of laser welding using micro-jet cooling. The effect of micro-jet cooling on microstructure and mechanical properties of the weld metal deposit was carried out. New welding process was analyzed for use in the automotive industry. Studies have confirmed the positive effect of cooling micro-jet cooling both for the MIG welding and laser welding.
9
Content available Plastic Properties of Fine-Grained WMD After Micro-Jet Cooling
Hadryś D., Węgrzyn T., Piwnik J.
Archives of Metallurgy and Materials
|
2014
|
Vol. 59, iss. 3
919--923
EN
Micro-jet welding is an innovative method of weld forced cooling immediately after welding. It allows to obtain weld with superior properties in comparison to conventional welding. The reason for this is to obtain a more favorable structure of the weld metal deposit (WMD) with much higher amount of acicular ferrite (AF). Different structures and mechanical properties of weld metal deposit were obtained by using various gases for cooling. The paper shows the relationship between the type of gas for micro-jet cooling and plastic properties of the weld joint. Coefficient of restitution and plastic strain were selected to describe changes of weld plastic properties for different micro-jet cooling gases. The tests were performed in dynamic conditions (impact).
PL
Spawanie z chłodzeniem mikrojetowym to nowatorska metoda spawania z wymuszonym chłodzeniem spoiny bezpośrednio po spawaniu. Pozwala ona na uzyskanie połączeń spawanych o właściwościach lepszych w porównaniu do spawania tradycyjnego. Przyczyną tego jest uzyskiwania korzystniejszej struktury stopiwa z większą zawartością drobnoziarnistego ferrytu (acicular ferrite – AF). Dzięki zastosowaniu różnych gazów do chłodzenia spoiny, można uzyskiwać różne struktury stopiwa i właściwości mechaniczne. W artykule przedstawiono zależność pomiędzy rodzajem gazu do chłodzenia mikrojetowego, a własnościami plastycznymi połączenia spawanego. Jako wielkości opisujące własności plastyczne wybrano współczynnik restytucji i odkształcenie trwałe. Testy przeprowadzono w warunkach dynamicznych.
10
Content available Acicular Ferrite in Micro Welding Technologies
Węgrzyn T., Piwnik J., Hadryś D.
Archives of Metallurgy and Materials
|
2014
|
Vol. 59, iss. 2
581--583
EN
Laser is widely applied in micro welding. Apart from that method, welding with micro-jet cooling could be treated as another important method for thin structure welding. Until that moment micro-jet technology is not very popular. An article presents actual information about innovate welding technology with micro-jet cooling in comparison with standard laser welding. There were given information about influence of both micro welding method on metallographic structure of thin steel welds. Amount of AF was tested in two cases.
PL
Laser jest szeroko stosowany w mikro-spawaniu. Oprócz tej metody, spawanie z chłodzeniem mikrojetowym powinno być traktowane jako ważna metoda spawania cienkościennych konstrukcji. W artykule przedstawiono innowacyjną technologię spawania z chłodzeniem mikrojetowym w porównaniu do spawania laserowego. Uzyskano informacje o wpływie obu metod na strukturę metalograficzną stalowych cienkościennych konstrukcji. Zawartość ferrytu AF była porównana w obu przypadkach.
11
Content available remote Heat treatment of Ni–Mn–Cu cast iron
Janus A., Granat K.
Archives of Civil and Mechanical Engineering
|
2014
|
Vol. 14, no. 4
602--607
EN
Examined was the influence of chemical composition defined by the nickel equivalent, as well as time and temperature of soaking on course of decomposition process of metallic matrix in the austenitic Ni–Mn–Cu cast iron. In alloys with the equivalent value ranging from 16.0% to 23.0%, with properly selected heat-treatment parameters, possible is controlled, partial transition of austenite to hard acicular ferrite. Obtained is the structure morphologically corresponding to that of ausferrite, characteristic for cast iron quench-hardened with isothermal transformation (e.g. CGI or ADI). Replacing the quench-hardening operation by soaking permits, among others, obtaining homogeneous structure in the entire cross-section of solid thick-walled castings or elimination of quenching stresses.
12
Content available Spawanie z chłodzeniem mikrojetowym propozycją nowej technologii napraw pojazdów
Węgrzyn T., Hadryś D.
Zeszyty Naukowe. Transport / Politechnika Śląska
|
2013
|
z. 78
117--123
PL
Spawanie jest jedną z najpopularniejszych metod łączenia materiałów. Znalazło ono również zastosowanie w produkcji i naprawach konstrukcji nośnych różnego rodzaju pojazdów i maszyn roboczych. Konstrukcje te muszą cechować się między innymi wysoką niezawodnością przy narażeniu na zmienne obciążenia. Ważny jest tu aspekt odpowiednio wysokich wartości wielkości opisujących własności plastyczne połączeń spawanych. Niestety, pomimo tego, że spawanie jest znane od wielu lat, niektóre aspekty z nim związane nastręczają pewnych trudności. Z tego też powodu ciągle prowadzone są prace polegające na przykład na opracowywaniu nowych materiałów dodatkowych do spawania, urządzeń spawalniczych lub nowatorskich metod spawania. W artykule przedstawiono aparat do spawania blach stalowych z chłodzeniem mikrojetowym (do spawania mikrojetowego). Ta nowatorska metoda spawania umożliwia sterowanie strukturą spoiny, co pozwala na uzyskanie lepszych właściwości mechanicznych połączenia spawanego. Uzyskiwane wartości wielkości mechanicznych są nieosiągalne dla konwencjonalnych metod spawania. Metoda ta może zatem pozytywnie wpłynąć na rezultaty prac spawalniczych prowadzonych na potrzeby produkcji i w naprawach pojazdów.
EN
Welding is one of the most popular methods of joining materials. It was also used in the production and repairs of construction of various types of vehicles and machines. These structures need to be characterized by high reliability when exposed to varying loads. An important aspect is sufficiently high value of plastic properties of welded joints. This method has been known for many years, but some aspects of welding are problematic. It is a reason to work for carried out for example new materials for welding, welding equipment and innovative welding methods. This paper presents the Apparatus for steel welding with micro-jet cooling. This innovative method of welding allows to control of weld metal deposit structure. It is a reason for better mechanical properties of the weld. The obtained values are unavailable to conventional welding methods. This method may therefore have a positive impact on the results of the welding work for the production and repair of vehicles.
13
Content available remote Plastic properties of weld after micro-jet cooling
Piwnik J., Hadryś D., Skorulski G.
Journal of Achievements in Materials and Manufacturing Engineering
|
2013
|
Vol. 59, nr 1
20--25
EN
Purpose: of that paper was analysing main plastic properties of welds made by MIG method with micro-jet cooling. The main reason of it was investigate possibilities of getting better plastic properties of welds made by MIG method with micro-jet cooling than welds made by ordinary welding method. It is possible because higher amount of acicular ferrite (AF) in WMD (weld metal deposit) is obtained in MIG method with micro-jet cooling in relation to ordinary welding method. Design/methodology/approach: During research Erichsen cupping tests and bending tests were carried out for welds made by MIG method with micro-jet cooling and ordinary welding method. Findings: High amount of acicular ferrite influences positively on plastic properties. Higher value of plastic parameters were observed for welds made by MIG method with micro-jet cooling. Research limitations/implications: That research was made for MIG method only. Another method of welding was not tested. Other methods of welding have not been tested, but it is suspected that similar phenomena are taking place. Practical implications: MIG method with micro-jet cooling `it is way to get better plastic properties of welds in relation to welds made by ordinary welding method. It is very important because it could be used to steering of mechanical properties of welded constructions. Originality/value: In this research welds made by new method of welding (welding with micro-jet cooling) were compare witch welds made by ordinary welding method. New method of welding is very promising and capable of industrial application, mainly due to the significant improvement of weld properties and quality.
14
Content available Oxygen in steel WMD after welding with micro-jet cooling
Węgrzyn T., Piwnik J., Hadryś D.
Archives of Metallurgy and Materials
|
2013
|
Vol. 58, iss. 4
1067--1070
EN
Until that moment micro-jet technology was tested only for MIG welding process with argon as a shielded gas. An article presents actual information about innovate welding technology with micro-jet cooling. There are put down information about gases that could be chosen both for MIG/MAG welding and for micro-jet process. There were given information about influence of various micro-jet gases on metallographic structure of steel welds. Mechanical properties of weld was presented in terms of oxygen amount in WMD (weld metal deposit).
PL
Dotychczas technologia mikrojetowa była stosowana tylko w spawalniczym procesie MIG, gdzie gazem osłonowym był argon. W artykule przedstawiono innowacyjną technologię spawania z chłodzeniem mikrojetowym. Podano informacje zarówno dla gazów, które mogą być wybrane dla spawania MIG/MAG i dla mikrojetowego procesu. Uzyskano informacje o wpływie doboru gazu mikrojetowego na strukturę metalograficzną stalowych spoin. Własności mechaniczne złącza podano w funkcji zawartości tlenu w stopiwie.
15
Content available Main micro-jet cooling gases for steel welding
Węgrzyn T., Piwnik J., Łazarz B., Hadryś D.
Archives of Metallurgy and Materials
|
2013
|
Vol. 58, iss. 2
555--557
EN
An article presents actual information about innovate welding technology with micro-jet cooling. There are put down information about gases that could be chosen for micro-jet process. There were given information about influence of various micro-jet gases on metallographic structure of steel welds.
PL
W artykule przedstawiono innowacyjną technologię spawania z chłodzeniem mikro-jetowym. Podano informacje nt gazów, które mogą być wybrane dla mikro-jetowego procesu. Uzyskano informacje o wpływie doboru gazu mikro-jetowego na strukturę metalograficzną stalowych spoin.
16
Content available Low alloy steel welding with micro-jet cooling
Węgrzyn T., Piwnik J.
Archives of Metallurgy and Materials
|
2012
|
Vol. 57, iss. 2
540-543
EN
Low alloy steel is used for many important structures. In that material there is a small amount of carbon and controlled percentage of alloy elements such as Ni, Mn, Mo, Si in steel and welded joints. Especially Ni, Mo, O could be treated as elements positively influencing impact toughness of welded structures. Metallographic structure of weld metal deposit (WMD) having composition of 400 ppm O and 2% Ni or 0.4% Mo and is very beneficial because of high percentage of acicular ferrite (until 65%) and thus WMD has good mechanical properties. For a long time researchers were putting two questions: how to lift percentage of AF in weld, and further what consequence that fact gives? Micro jet technology could be treated as a chance to resolve that problem. The present paper describes the influence of artificially lifted amount of acicular ferrite in WMD (above 65%) on the behaviour of steel weld properties using micro-jet cooling.
PL
Do ważnych konstrukcji używana jest stal niskostopowa, bardzo często z małą ilością węgla i kontrolowaną zawartością pierwiastków stopowych, takich jak Ni, Mn, Mo, Si. Zwłaszcza Ni, Mo, O są uważane za pierwiastki pozytywnie wpływające na udarność spawanych konstrukcji. Struktura metalograficzna stopiwa posiadającego 400 ppm O i 2% Ni albo 0,4% Mo korzystnie wpływa na własności mechaniczne złącza z powodu wysokiej zawartości drobnoziarnistego wewnatrz-ziarnowego ferrytu (ferryt AF) w stopiwie (do 65%) i przez to na dobre własności mechaniczne. Przez długi czas badacze zadają dwa pytania: jak można podnieść zawartość ferrytu AF w spoinie i jakie to przyniesie następstwa? Technologie microjetowa uważa się za szansę na rozwiązanie tego problemu. Przedstawiony artykuł opisuje wpływ sztucznie zawyżonej zawartości ferrytu AF w stopiwie (ponad 65%) na właściwości stalowego złącza ze względu na zastosowanie mikrojetowego chłodzenia.
17
Content available Control over the steel welding structure parameters by micro-jet cooling
Węgrzyn T., Piwnik J., Wieszała R., Hadryś D.
Archives of Metallurgy and Materials
|
2012
|
Vol. 57, iss. 3
679-685
EN
The paper presents the characteristics of innovative technology of micro-jet cooling in MIG welding (according to PN-EN ISO 4063:2009). Presented results received at different jet hole geometry and various coolant pressure. This technology allows get, with appropriately selected parameters of cooling increased ferrite AF content in weld metal, up to 14% for standard MIG technology. This structure proves toughness, especially at temperature -40 degree Celsjus.
PL
W pracy scharakteryzowano innowacyjną technologię chłodzenia mikrojetowego podczas spawania metoda MIG (zgodnie z norma PN-EN ISO 4063:2009). Przedstawiono wyniki badań uzyskanych przy różnych ustawieniach geometrycznych otworów chłodzących oraz różnym ciśnieniu medium chłodzącego. Zastosowanie tej technologii pozwala uzyskać, przy odpowiednio dobranych parametrach chłodzenia większą zawartość ferrytu AF w stopiwie, do 14% w odniesieniu do standardowej technologii MIG. Ma to wpływ na udarność, szczególnie przy temperaturze -40 stopni Celsjusza.
18
Content available remote Parameters of welding with micro-jet cooling
Węgrzyn T., Piwnik J., Łazarz B., Wieszała R., Hadryś D.
Archives of Materials Science and Engineering
|
2012
|
Vol. 54, nr 2
86-92
EN
Purpose: of that paper was analysing main welding process with parameters of micro-jet cooling. The main reason of it was investigate possibilities of getting varied amount of acicular ferrite (AF) in WMD (weld metal deposit). High amount of acicular ferrite influences positively impact toughness of weld. For optimal amount of AF it is necessary to determine the parameters (eg. number of clusters, diameter of stream) of the micro-jet. Design/methodology/approach: During research with varied micro-jet parameters the chemical analysis, micrograph tests and Charpy V impact test of the metal weld deposit on pendulum machine were carried out. The Charpy V impact test was prepared according to standard ISO EN 148-1 Metallic materials - Charpy pendulum impact test - Part 1: Test method. Samples for impact testing were prepared according to standard ASTM A370. Findings: Varied amount of acicular ferrite in weld metal deposit (in range 55-75%) in terms of micro-jet cooling parameters (numbers of jet, gas pressure). This high amount of acicular ferrite is unheard in weld metal deposit in another way or other methods of welding like MAG or TIG. Research limitations/implications: That research was made for MIG method (according to PN-EN ISO 4063:2009) only. Another method of welding in this article was not tested. Other methods (for eg. MAG, TIG) have not been tested, but it is suspected that similar phenomena are taking place. Practical implications: Micro-jet cooling it is way to get higher amount of acicular ferrite in weld metal deposit than the usual methods of welding. It is very important because it could be used to steering of weld joint structure and mechanical properties (for example impact toughness). Originality/value: In this research new method of cooling weld joint during welding was used. At the present time use of micro-jet cooling while MIG is in the testing phase and requires an accurate diagnosis.This method is very promising and capable of industrial application, mainly due to the significant improvement of weld quality and reduces costs.
19
Content available remote Micro-jet cooling gases for low alloy steel welding
Węgrzyn T., Piwnik J., Łazarz B., Plata M.
Archives of Materials Science and Engineering
|
2012
|
Vol. 58, nr 1
40--44
EN
Purpose: of that paper was analysing main gases used in micro-jet cooling after welding. The main reason of it was to investigate possibilities of getting varied amount of acicular ferrite (AF) in WMD (weld metal deposit). High amount of acicular ferrite influences positively impact toughness of weld. Design/methodology/approach: During research varied gases were testes as micro-jet parameters. Further the chemical analysis, micrograph tests and Charpy V impact test of the metal weld deposit on pendulum machine were carried out. The Charpy V impact test was prepared according to standard ISO EN 148-1 Metallic materials - Charpy pendulum impact test - Part 1: Test method. Samples for impact testing were prepared according to standard ASTM A370. Findings: Varied amount of acicular ferrite in weld metal deposit (in range 55%-75%) in terms of micro-jet cooling parameters (in that case kind of gas and gas pressure). This high amount of acicular ferrite is unheard in weld metal deposit in another way or other methods of welding such as MAG or TIG. Research limitations/implications: That research was made for MIG method (according to PN-EN ISO 4063:2009) only. Another method of welding in this article was not tested. Practical implications: Micro-jet cooling it is way to get higher amount of acicular ferrite in weld metal deposit than the usual methods of welding. It is very important because it could be used to steering of weld joint structure and mechanical properties (for example impact toughness). Originality/value: In this research new method of cooling weld joint during welding was used. At the present time use of micro-jet cooling while MIG is in the testing phase and requires an accurate diagnosis. This method is very promising and capable of industrial application, mainly due to the significant improvement of weld quality and reduces costs.
20
Content available remote Car body welding with micro-jet cooling
Węgrzyn T., Piwnik J., Hadryś D., Wieszała R.
Journal of Achievements in Materials and Manufacturing Engineering
|
2011
|
Vol. 49, nr 1
90--94
EN
Purpose: of that paper was analysing welding process with device to micro-jet cooling of weld joint during welding. The main reason of it was investigate possibilities of getting higher amount of desired phase acicular ferrite. High amount of acicular ferrite influences positively on high value of impact toughness. Increasing the value of impact toughness is particular importance when making repairs car body parts. It is necessary to determine the parameters of the micro-jet cooling so that you can introduce this method for widespread use. Design/methodology/approach: During research the chemical analysis, micrograph tests and Charpy V impact test of the metal weld deposit on pendulum machine were carried out. The Charpy V impact test was prepared according to standard ISO EN 148-1 Metallic materials - Charpy pendulum impact test - Part 1: Test method. Samples for impact testing were prepared according to standard ASTM A370. Findings: Micro-jet cooling of weld joint during welding could influence on amount of acicular ferrite in weld metal deposit (above 65%). This is unheard in other ways. Research limitations/implications: That research was made for MIG method only. Another method of welding was not tested. Other methods have not been tested, but it is suspected that similar phenomena are taking place. Practical implications: Micro-jet cooling it is way to get higher amount of acicular ferrite in weld metal deposit than the usual methods of welding. It is very important because it could be used to steering of weld joint structure and mechanical properties (for example impact toughness). Originality/value: In this research new method of cooling weld joint during welding was used. At the present time use of micro-jet cooling while MIG is in the testing phase and requires an accurate diagnosis. This method is very promising and capable of industrial application, mainly due to the significant improvement of weld quality and reduces costs.
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