Wyniki wyszukiwania - BazTech

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Properties and Microstructure of Laser Welded Dissimilar Joints of TP347-HFG and S235JR Steels with Additional Material

Danielewski H., Skrzypczyk A., Mulczyk K., Zrak A.

Archives of Metallurgy and Materials

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2020

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Vol. 65, iss. 3

1163--1170

EN

Paper presents results of laser welding of dissimilar joints. Flange pipe joints of austenitic TP347-HFG and low carbon S235JR steels were performed. Possibility of laser girth welding of dissimilar joints was presented. Welding of dissimilar materials are complex phenomena, chemical composition of chromium and nickel base austenitic steel with carbon amount of 0.07%, comparing to low carbon steel with trace amount of chromium, nickel and with 0.17% of carbon are different, and affect on welding result. Amount of carbon and chromium have great effect on steel phase transformation and crystallization process, which affect on material hardenability and strength characteristic. In conventional GMA welding methods solidification process of different metals is controlled by use of a selected filler material, for creating buffer zone. The main advantages of laser welding over other methods is process without an additional material, nevertheless some application may require its use. Laser welding with additional material combines advantages of both methods. To carry out weld with high strength characteristic, without welding defects, selecting chemical composition of filler wire are required. Welding parameters was obtained using numerical simulation based on Finite Element Method (FEM). Joint properties was investigated using hardness test. Metallographic analysis of obtained weld was carried out using optical microscopy and energy dispersive spectroscopy (EDS) analysis.

2

The Influence of Treatment Parameters on the Microstructure, Properties and Bend Angle of Laser Formed Construction Bars

Kurp P., Mucha Z., Tofil S., Mulczyk K.

Archives of Metallurgy and Materials

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2016

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Vol. 61, iss. 2B

1151--1156

EN

In this paper, the authors presented the research on laser formed construction bars made of C20 steel on the example of the T-shape. The CO2 TRUMPF TruFlow 6000 laser was used in the research. The influence of the laser treatment parameters (the power and speed of the heat source) on the volume of the bend angle, structure and properties of the elements (hardness and tensile strength) was examined. On the basis of the results obtained from the conducted experiments, the authors suggested a way of selecting treatment parameters so that the element should meet the strength assumptions at the allowable time of its implementation.

3

Spawanie laserowe aluminiowych rur cienkościennych

Kurp P., Mulczyk K.

Spajanie Materiałów Konstrukcyjnych

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2013

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Nr 1 (19)

20--22

PL

Spawanie precyzyjne cienkościennych rur aluminiowych jest operacją ciężką do wykonania tradycyjnymi metodami z uwagi na niską temperaturę topnienia stopów tego pierwiastka. Proces musi być precyzyjnie kontrolowany. Autorzy niniejszego artykułu zbadali możliwość spawania cienkościennych rur aluminiowych przy użyciu lasera CO2. Badania obejmowały dobór parametrów procesu, takich jak: moc wiązki i prędkość przemieszczania źródła ciepła. Efekty spawania laserowego zostały zaprezentowane w tym artykule. W dalszej części prac autorzy zamierzają zbadać zmiany w strukturze spoiny elementu oraz wpływ procesu na właściwości materiałowe obrabianych elementów.

4

Analiza wpływu parametrów procesu cięcia laserowego na geometrię szczeliny cięcia

Mulczyk K

Zeszyty Naukowe Politechniki Świętokrzyskiej. Nauki Techniczne

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2012

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Z. 17

109-116

PL

Celem tej pracy było zbadanie wpływu parametrów obróbki na geometrię szczeliny cięcia przy cięciu stali St3. W doświadczeniach została wykorzystana metoda cięcia przez spalanie i wydmuchiwanie, bowiem daje ona szczególnie dobre wyniki przy cięciu stali. Polega ona na wypaleniu strumieniem tlenu, materiału stopionego pod wpływem działania zogniskowanej wiązki.

EN

This paper discusses the influence of the parameters of the laser machining process on the cutting slot shape. The experiment was carried out on the 5mm thick carbon steel. The 6 kW CO2 laser was used. The cutting slot profile was achieved by means of machining front side of metal sheet. On the basis of the findings, the influence of the cutting speed to the slot geometry was deduced. Additionally, the shapes of the cutting slots profiles achieved in the experiment was compared between 2 positions of the beam focus. Best shape of cutting slot was achieved with speed 1600 mm/min at power level 1 kW.