J. Mater. Sci. Technol. ›› 2012, Vol. 28 ›› Issue (6): 537-542.

• Light Weight Metals • 上一篇    下一篇

Effects of Butt Design and Gap Width on the Microstructure and Mechanical Properties of Magnesium Alloy Welds

董红刚   

  1. 大连理工大学材料科学与工程学院
  • 收稿日期:2011-07-29 修回日期:2011-09-21 出版日期:2012-06-28 发布日期:2012-07-02
  • 通讯作者: 董红刚
  • 基金资助:

    the Key Technologies R & D Program of Liaoning

Effects of Butt Design and Gap Width on the Microstructure and Mechanical Properties of Magnesium Alloy Welds

Honggang Dong1,2), Chuanqing Liao1), Liqun Yang1)   

  1. 1) School of Materials Science and Engineering, Dalian University of Technology, Dalian 116085, China
    2) State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China
  • Received:2011-07-29 Revised:2011-09-21 Online:2012-06-28 Published:2012-07-02
  • Contact: Honggang Dong
  • Supported by:

    the State Key Lab of Advanced Welding and Joining, Harbin Institute of Technology (Project No. 09009)

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摘要： The effects of parallel and angular butt designs with different gap widths on the microstructure and mechanical properties of the resultant magnesium joints in gas tungsten arc welding were investigated. The experimental results displayed that the tensile strength of the weld made with angular butt joint and 0.3mm-wide gap reached 266MPa, the joint fractured through the heat-affected zone or base metal during tensile testing, and the microstructure examination showed that no macropore appeared in the fusion zone. However, macropores in diameter of larger than 200 micron occurred for other joint designs, the tensile strength of the resultant weld decreased, and the joint fractured through the fusion zone during tensile testing. The fracture surfaces were examined with scanning electron microscope and the microhardness distribution in the welds was measured using a Vickers microhardness tester.

Abstract: The effects of parallel and angular butt designs with different gap widths on the microstructure and mechanical properties of the resultant magnesium joints in gas tungsten arc welding were investigated. The experimental results displayed that the tensile strength of the joint made with angular butt joint and 0.3 mm-wide gap reached 266 MPa, the joint fractured through the heat-affected zone or base metal during tensile testing, and the microstructure examination showed that no macropore appeared in the fusion zone. However, macropores in diameter of larger than 200 micron occurred for other joint designs, the tensile strength of the resultant joints decreased, and the joints fractured through the fusion zone during tensile testing. The fracture surfaces
were examined by scanning electron microscopy and the microhardness distribution in the joints was measured by using a Vickers microhardness tester.

Key words: Magnesium, Gas tungsten arc welding, Butt design, Gap width, Pore, Mechanical properties