Spawanie stopów magnezu wiąską lasera CO(2)

• Autorzy: Kołodziejczak P. , Kalita W. , Kolasa A.
• Konferencja: Zaawansowane Techniki Spajania Tworzyw Konstrukcyjnych (1; Sympozjum Naukowe Zakładu Inżynierii Spajania)
• Języki publikacji: PL

Abstrakty

PL

Celem pracy jest przedstawienie warunków doświadczalnych laserowego spawania stopów magnezu i właściwosci otrzymanych złączy doczołowych. Dla oceny ich jakości przeprowadzono badania metalograficzne i strukturalne, analizę rozkładu pierwiastków stopowych w spoinie i jej otoczeniu, badania wytrzymałosciowe (statyczne próby rozciągania i zginania) oraz porównanwcze badania odporności korozyjnej połączeń i materiału rodzimego. Przedstawione wyniki oceny struktur, właściwości mechanicznych i odporności na korozje jednoznacznie wskazują na użyteczność zastosowania technologii laserowego spawania jako konkurencyjnej w stosunku do konwencjonalnych technik spawania.

EN

The objective of this paper is to report the results of CO(2) laser beam kryhole welding of samples of alloys of MgAlZn and MgAlMn groups. Welding has been carried out with the laser of maximum power of 2,5kW. The workpieces of alloys with thicknesses of 4,5 mm have been butt-welded with helium used as a shielding gas. With the chosen flow rate of helium shielding and the focal position set on the metal surface the nearly parallel boundaries of fusion zones were obtained. In the fusion zones and the surroundings neither porosity or cracks have been observed. However, as a consequence of the high grain refinement and increased precipitations at the grain boundaries in the fusion zones the microhardness in these regions increased for all we!ds when compared to the base metals. The elemental distribution in the weId cross-sections permitted to find changes due to heating and the recrystallization in the fusion zones. In the tensile strength tests the fracture of welded sampies for all alloys appeared far from the fusion zones - in the region of base metal. These tests exhibit the differences in stress values for fracture and especially in the elongation values between base metal and the welds: the elongations for the joints were reduced by 30 % that have given the evidence of some loss of plasticity of the welds. When the welded and unwelded sampies were put to the tests on the three point bend stand it has been observed that the differences appeared only for the brittle alloy (AZ91). For the sampies of as-cast materials and sampies with the joints the comparative corrosion resistance tests have been performed by electrochemical method followed by microscopic examinations. The polarisation curves have not shown the differences in corrosion resistance, however the SEM observations presented the influence of the joints on corrosion development.

Słowa kluczowe

PL

spawanie laserowe; stopy magnezu; właściwości połączeń spawanych

EN

magnesium alloys; laser beam welding; properties of welded joints

• Wydawca: Oficyna Wydawnicza Politechniki Warszawskiej
• Czasopismo: Prace Naukowe Politechniki Warszawskiej. Mechanika
• Rocznik: 2006
• Tom: z. 215
• Strony: 97--109
• Opis fizyczny: Bibliogr. 25 poz., wykr., rys.

Twórcy

autor

Kołodziejczak P.

autor

Kalita W.

autor

Kolasa A.

• Zakład Inżynierii Spajania Politechnika Warszawska

Bibliografia

• [1] Friedrich H., Schumann S.: Research fora "new age of magnesium" in the automotive industry. J. Materials Processing Technology, vol. 117, 2001, pp. 276-281.
• [2] Aghion E., Bronfin B., Eliezer D.: The role of the magnesium industry in protecting the environment. J. Materials Processing Technology, vol. 117, 2001, pp. 381-385.
• [3] Mordike B.L., Ebert T.: Magnesium. Properties - applications - potential. Material Science and Engineering. A302, 2001, pp. 37-45.
• [4] Weishait, A.; Galun, R.; Mordike, L.: CO2 Laser Beam Welding of Magnesium-Based Alloys. Welding Journal, Vol. 77, no.4, 1998, pp. 149-154.
• [5] Daugclates, U., Schram, A.; Kettler, C.: Joining of magnesium alloys. Materialwissenschaft und Werkstofftechnik, Vol. 30, no. 10, 1999, pp. 623-627.
• [6] Dahri, M.; Masse, J,E.; Mathieu, J.F.; Barreau, G.; Autric, M.: CO; Laser Welding of Magnesium alloys. SPIE (High-Power Lasers in Manufacturing), Vol. 3888, 2000, pp. 725-732.
• [7] Dhahri, M.; Masse, J.E.; Mathieu, J.F.; Barreau, G.; Autric, M.. Laser Weldability of WE43 Magnesium Alloy for Aeronautic Industry. Proc. of the LANE 2001, August 28-31, 2001, Erlangen, Germany, pp. 297-310.
• [8] Zhao, H.; DebRoy, T.: Pore Formation during Laser Beam Welding of Die-Cast Magnesium Alloy AMOOB - Mechanism and Remedy. Welding Research Suppl., 2001, pp. 204-210.
• [9] Lalhabai, S.; Barton, K.J.; Harris, D.; Lloyd, P.G.; Yiano, D.M.; McUan, A.: Welding and Weldability of AZ31B by Gas Tungsten Arc and Laser Beam. Proc. Magnesium Technology 2003. March 2-6, 2003, San Diego, CA, USA, pp. 157-162.
• [10] Watkins, K.G.; Laser Welding of Magnesium Alloys. Proc, Magnes mm Technology 2003, March 2-6,2003, San Diego, CA, USA, pp. 153-156,
• [11] Stern, A., Munrtz, A.; Koln, G.: Applicalion of Welding Technologies for Joining of Mg Alloys. Microstructure and Mechanical Properties. Proc. Magnesium Technology 2003, March 2-6, 2003, San Diego, CA, USA, pp. 163-170.
• [12] Kalita, W.; Kołodziej czak, P.; Pokhmurska, H.: Welding of Mg-Based Alloy AM20 by CO; Laser Beam. Proc. Intl. Conf on Laser Technologies in Welding and Malerials Processing, May 19-23, 2003, Katsiveli, Ukraine, pp. 214-216.
• [13] Kalita W., Kołodziejczak P., Hoffman J , Mościcki T, Szymańskj Z.: Spawanie stopu magnezu AM20 laserem CO2. Przegląd Mechaniczny, nr. 7-8, 2003, str, 48-51.
• [14] Dasgupta A.K., MazumderJ.: Laser Welding of AM60 Magnesium Alloy. Proc. Magnesium Technology 2004, March 14-18, 2004, Charlotle, NC, USA, pp.43-48.
• [15] Kalita W., Kołodziejczak P., Kolasa A., Hoffman J.: Właściwości złączy ze stopów magnezu spawanych wiązką lasera CO2. Przegląd Spawalnictwa, nr 5-7,2004, str. 109-111
• [16] Kalita W., Kołodziejczak P., Kwialkowski L., Hoffman J.: Properties of the butt-welded joints of C0: laser welded Mg alloys. Proc. of the LANE 2004, Sept. 21-24, 2004, Erlangen, Germany, vol. 1, pp. 317-328.
• [17] Cao X., Xiao M., Jahazi M., Lin Y.: Nd:YAG Laser Welding of Magnesium Alloy Castings. Proc. Magnesium Technology 2005, Febr. 13-17, 2005, San Francisco, CA, USA, pp. 441-446
• [18] Kalita W., Kolodziejczak P., Kwiatkowski L., Grobelny M., Hoffman J.: Properties of the CO2 Laser Welded Joints of Dissimilar Magnesium Alloys. Proc, IInd Intl. Conf. On Laser Technologies in Welding and Materials Processing, Katsiveli, Ukraine, May 19-23, 2005, pp. 182-185.
• [19] Kołodziejczak P., Kalita W., Kwiatkowski L., Grobelny M., Hoffman J.: puality Assessment of CO2 Laser-welded Joints of Magnesium Alloys. Proc. 13th Intl. Scientific Conf. CO-MAT-TECH 2005, Trnava, Slovakia, October 20-21, 2005, pp. 563-571.
• [20] Kwiatkowski L., Grobelny M., Kalita W., Kołodziejczak P.: Corrosion Properties of the Butt-welded Joints of Laser Welded Mg Alloys. Inżynieria Powierzchni, vol. II, no. 2A, 2005 pp.191-197.
• [21] Lee W.-B., Yeon Y-M., Kim S.K., Jung S.B.: Microstructure and Mechanical Properties of Friction Stir Welded AZ31 Mg Alloy. Proc. Magnesium Technology 2002, Febr. 17-21, 2002, Seatlle, Wash., USA, pp. 309-312.
• [22] Johnson R., Threadgill R.: Friction Stir Welding of Magnesium Alloys. Proc. Magnesium Technology 2003, March 2-6, 2003, San Diego, CA, USA, pp. 147-152.
• [23] Skar J.I., Gjestland H., Oosterkamp L.D., Albright D.I.: Friction Stir Welding of Magnesium Die Casting. Proc. Magnesium Technology 2004, March 14-18, 2004, Charlotte, NC, USA, pp. 25-30.
• [24] Li N., Pan T-Y., Cooper R.P., Houston D.Q., Feng Z., Sautell M.L.: Friction Stir Welding of Magnesium AM60 Alloy. Proc. Magnesium Technology 2004, March 14-18, 2004, Charlotte, NC, USA, pp. 19-23.
• [25] Haferkarnp, H.; Goede, M.; Bormann, A.; Cordini, P.: Laser Beam Welding of Magnesium Alloys - New Possibilities using Filler Wire and Arc Welding. Proc. of the LANE 2001, August 28-31, 2001, Erlangen, Germany, pp. 333-338.