Microstructure Analysis of Laser Bonding Welding on Steel-Aluminum


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Laser bonding welding test of the lap joint between steel and Al was conducted. The microstructure analysis is carried out by means of metallographic microscope, which provides an important theoretical and experimental basis for the popularization and application of laser welding of steel / aluminum dissimilar metal structures. The results showed that under the conditions of 1650W laser power, 35m/s welding speed, +3mm defocus amount and 25L/min flow rate of Ar as the protective gas, there are no cracks, pores and inclusions in the weld zone. The fusion line is smooth and smooth. Under the conditions of 1650W laser power, 38m/s welding speed, +3mm defocus amount and 25L/min flow rate of Ar as the protective gas, the overall appearance of the weld zone of the laser welding joint, there are serious cracks, pores and other defects in the weld area. In the P=1680W, V=35mm/s, f=+1mm, q=20L/min, the crystal structure appeared, in the process of cooling, the crack expands and forms a radial shape under the action of internal stress.



Edited by:

Sujan Debnath




K. Xu and S. Q. Zhang, "Microstructure Analysis of Laser Bonding Welding on Steel-Aluminum", Materials Science Forum, Vol. 911, pp. 28-33, 2018

Online since:

January 2018





* - Corresponding Author

[1] J. WU and L. LI: The effect of laser welding process on the welding guality of aluminum and steel [J]. Welding Technology, 2000, 29(5): 19-21.

[2] Z. LEI, G.L. QIN and S.Y. LIN, et al. Fusion-brazing joining for dissimilar metals between 5A02 aluminium alloy and zinc-coated steel based on laser-MIG hybrid welding [J]. Chinese Journal of Mechanical Engineering, 2009, 45(3): 94-98.

DOI: https://doi.org/10.3901/jme.2009.03.094

[3] H. Oikawa, S. Ohmiya and T. Yoshimura: Resistance spot welding of steel and aluminum sheet using insert metal sheet [J]. Science and Technology of Welding and Joining, 1999, 4(2): 80-88.

DOI: https://doi.org/10.1179/136217199101537608

[4] R.F. Qiu, H.X. Shi and K.K. Zhang, et al. Interfacial characterization of joint between mild steel and aluminum alloy welded by resistance spot welding [J]. Materials Characterization, 2010, 61(7): 684-688.

DOI: https://doi.org/10.1016/j.matchar.2010.03.015

[5] R.F. QIU, H.X. SHI and K.K. Zhang, et al. Research status of resistance spot welding between steel and aluminum alloy for automobile body [J]. Electric Welding Machine, 2010, 40(5): 150-154.

[6] Y. YANG and Y. SHI: The development of welding of dissimilar material-aluminum and steel [J]. Journal of Changchun University, 2011, 21(2): 21-25.

[7] D.W. ZHOU, T. DAI, S.H. XU, et al. Microstructure and properties of galvanized steel/aluminum alloy laser-adhesive hybrid bonding [J]. The Chinese Journal of Nonferrous Metals, 2014, 24(7): 1736-1743.

[8] Weichiat Chen, Pual Ackerson, Pal Molian. CO2 laser welding of galvanized steel sheets using went holes [J]. Materials and Design, 2009, 17(30): 245-251.

DOI: https://doi.org/10.1016/j.matdes.2008.05.009

[9] W.Z. CHEN: Laser welding and cutting quality control [M]. Beijing: China Machine Press, (2010).

[10] Y.J. LI: Principle and application of welding [M]. Beijing: Chemical Industry Press, (2009).