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T. Węgrzyn, J. Piwnik and D. Hadryś

steels, Matterials letters 32, 115-163 (1997). [6] J. Słania, Influence of phase transformations in the temperature ranges of 1250-1000°Cand 650-350°Con the ferrite content in austenitic welds made with T 23 12 LRM3 tubular electrode. Archives of Metallurgy and Materials, zeszyt 3, 2005. [7] K. Krasnowski, Influence of Stress Relief Annealing on Mechanical Properties and Fatigue Strength of Welded Joints of Thermo-Mechanically Rolled Structural Steel Grade S420MC. Archives of Metallurgy 54, 4, 2009. [8] T. Wegrzyn

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T. Węgrzyn and J. Piwnik

Low Alloy Steel Welding with Micro-Jet Cooling

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.

Open access

D. Hadryś, T. Węgrzyn, J. Piwnik, Z. Stanik and W. Tarasiuk

Abstract

The material selected for this investigation was low alloy steel weld metal deposit (WMD) after MIG welding with micro-jet cooling. The present investigation was 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.

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T. Węgrzyn, J. Piwnik, W. Tarasiuk, Z. Stanik and M. Gabrylewski

References [1] Wegrzyn T., J. Piwnik & D. Hadryś, (2013). Oxygen in steel WMD after welding with micro-jet cooling, Archives of Metallurgy and Materials. 58(4). [2] Wegrzyn T., Piwnik J. & Hadryś, D. (2014). Acicular ferrite in micro welding technologies, Archives of Metallurgy and Materials. 59(2). [3] Węgrzyn, T., Piwnik, J. Wszołek, Ł. & Tarasiuk, W. (2015). Shaft wear after surfacing with micro-jet cooling, Archives of Metallurgy and Material. 60(4), 2625-2630. [4] Węgrzyn, T. Piwnik, J. Łazarz, B. & Tarasiuk, W. (2015

Open access

D. Hadryś, T. Węgrzyn and J. Piwnik

car body. Materials Science Forum 6 (2010). [10] T. Kasuya, Y. Hashiba, S. Ohkita, M. Fuji, Hydrogen distribution in multipass submerged arc weld metals, Science and Technology of Welding&Joining 6 , 4, 261-266 (2001). [11] J. Słania, Influence of phase transformations in the temperature ranges of 1250-1000°C and 650-350°C on the ferrite 923 content in austenitic welds made with T 23 12 LRM3 tubular electrode. Archives of Metallurgy and Materials 3 , (2005). [12] K. Krasnowski, Influence of Stress Relief Annealing on Mechanical Properties and Fatigue

Open access

T. Węgrzyn, J. Piwnik, Z. Stanik, D. Węgrzyn and D. Sieteski

). [15] T. Wegrzyn, J. Piwnik, D. Hadryś, Oxygen in steel WMD after welding with micro-jet cooling, Archives of Metallurgy and Materials 58, 4, (2013). [16] T. Wegrzyn, J. Piwnik, D. Hadryś, Acicular ferrite in micro welding technologies, Archives of Metallurgy and Materials 59, 2 (2014). [17] T. Węgrzyn, J. Piwnik, B. Łazarz, W. Tarasiuk, Mechanical properties of shaft surfacing with micro-jet cooling, ISSN 1392-1207. MECHANIKA 21(5), 419-423 (2015). [18] J. Piwnik, D. Hadryś, G. Skorulski, Plastic properties of weld

Open access

T. Wegrzyn, J. Piwnik and D. Hadrys

Technology of Welding&Joining 6, 4, 261-266 (2001). [6] J. Słania, Influence of phase transformations in the temperature ranges of 1250-1000°Cand 650-350°Con the ferrite content in austenitic welds made with T 23 12 LRM3 tubular electrode. Archives of Metallurgy and Materials, zeszyt 3/2005. [7] K. Krasnowski, Influence of Stress Relief Annealing on Mechanical Properties and Fatigue Strength of Welded Joints of Thermo-Mechanically Rolled Structural Steel Grade S420MC. Archives of Metallurgy 54, 4, (2009). [8] T. Wegrzyn

Open access

T. Węgrzyn, J. Piwnik, B. Łazarz and D. Hadrys

. Mirosławski, A. Silva, D. Pin-to, M. Miros, Oxide inclusions in steel welds of car body. Materials Science Forum 6 , 585 (2010). [6] T. Kasuya, Y. Hashiba, S. Ohkita, M. Fuji, Hydrogen distribution in multipass submerged arc weld metals, Science and Technology of Welding&Joining 6/4 , 261-266 (2001). [7] J. S łania, Influence of phase transformations in the temperature ranges of 1250-1000ºCand 650-350ºCon the ferrite content in austenitic welds made with T 23 12 LRM3 tubular electrode. Archives of Metallurgy and Materials, zeszyt 3

Open access

T. Wegrzyn, J. Piwnik, R. Wieszała and D. Hadrys

ofWelding&Joining 6/4 261-266 (2001). [7] J. Słania, Influence of phase transformations in the temperature ranges of 1250-1000_C and 650-350_C on the ferrite content in austenitic welds made with T 23 12 LRM3 tubular electrode. Archives of Metallurgy and Materials 50 , 3 (2005). [8] K. Krasnowski, Influence of Stress Relief Annealing on Mechanical Properties and Fatigue Strength of Welded Joints of Thermo-Mechanically Rolled Structural Steel Grade S420MC. Archives of Metallurgy 54 , 4 (2009). [9] T. Wegrzyn, Mathematical

Open access

D. Hadryś

, Metallurgy and Materials 50 , 3 (2005). [7] T. Węgrzyn, Nucleation Of Acicular Ferrite At Oxide Inclusion Sites In Basic Electrode Steel Metal Weld Deposit, International Society of Offshore and Polar Engineers ISOPE´98, Montreal, Canada (1998). [8] D. Hadryś, Impact load of welds after micro-jet cooling. Archives of Metallurgy and Materials 60 , 4 (2015). [9] D. Hadryś, J. Piwnik, W. Majewski, Plastic properties of welds after micro-jet cooling with different cooling gases. Advanced Materials Research 1036 (2014). [10] J. Pilarczyk, Poradnik