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Journal of KWJS. 2011;29(2):80-87. Published online May 7, 2011.
- Effects of Tool Speed on Joining Characteristics during Friction Stir Spot Welding of Mg-alloy(AZ31B) Sheet
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Hyung-Seop Shin, Yoon-Chul Jung, Kwang Choi
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- Abstract
- In this study, the friction stir spot welding (FSSW) of Mg alloy sheets has been tried using an apparatus devised with a CNC milling machine to give the precise control of joining condition including tool speed. The probe tool used is made of hard metal and composed of cylindrical shoulder and pin parts. The variation of morphologies formed after the friction stir spot welding depending on the plunge speed of the tool were investigated at each rpm of tool. The history of the temperature distribution and the vertical load induced during the spot welding with friction time were measured by using an Infrared Thermal Imager (THERMA CAMTM SC2000) and a loadcell located below the specimen fixture, respectively. Tensile-shear tests were also performed to evaluate the fracture load of welded specimens. In order to characterize the friction stir spot welding of Mg alloy sheets, the variation of the fracture load was discussed on micrographic observations, temperature distribution during the FSSW according to the plunge speeds of tool.
Keywords :Friction stir spot welding (FSSW);Mg alloy (AZ31B);Tool speed;Joining characteristics;Tensile-shear test
