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SONG Gang, HU Guanglong, REN Daxin, LIU Liming. Study on butt fusion welding characteristics of AZ31B magnesium alloy to steel by hybrid laser-TIG welding with Ni interlayer[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2015, 36(1): 43-46.
Citation: SONG Gang, HU Guanglong, REN Daxin, LIU Liming. Study on butt fusion welding characteristics of AZ31B magnesium alloy to steel by hybrid laser-TIG welding with Ni interlayer[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2015, 36(1): 43-46.
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Study on butt fusion welding characteristics of AZ31B magnesium alloy to steel by hybrid laser-TIG welding with Ni interlayer

  • 1.

    Key Laboratory of Liaoning Advanced Welding and Joining Technology, School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China

  • 2.

    Key Laboratory of Materials Modification by Laser, Ion, and Electron Beams(Ministry of Education), School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China

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  • Received Date: June 01, 2013
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    • Abstract
  • Investigations on butt fusion welding characteristics of AZ31B magnesium alloy to steel with Ni interlayer were carried out by utilizing the gradient energy density characteristic of laser-TIG heat source. The tensile strength and microstructure of the joint were examined by electronic tension machine, scanning electron microscopy (SEM) and X-ray diffraction (XRD). Results indicated that magnesium alloy can be butt joined to steel by hybrid laser-TIG welding with good Mg/Fe interface by using Ni foil as the interlayer. At the same time, tests showed that a distinct transition zone consisting of Fe, Ni and Al elements forms at the steel side nearby the interface; the microstructure of the joint is mainly composed of α-Mg and a large number of small white particles which are mainly composed of AlNi phase and dispersively distributed. The joint fractures nearby the Mg/Fe interface and the fracture surface shows a typical quasi-cleavage crack. The average of the joint tensile strength is 232 MPa, which is about 90% of the magnesium base metal.
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