Mechanical Properties Improvement of Semi-Solid State Joining of Aluminum Alloys SSM A356

Abstract:

The aim of this research was to study semi-solid state joining of SSM A356 aluminum alloys which welded at its semi-solid state temperature by using oxygen – acetylene heat source. Then a stirrer was used to stir the weld seam. The joining parameters were rotation speed 1,110 with welding speed 120 mm/min and rotation speed 1,320 rpm with welding speed 160 mm/min. The joining temperatures were 575-590 and 590-610 oC. Joining was performed under nitrogen shielding gas and under argon shielding gas. Physical appearance, macrostructure, microstructure and mechanical properties were analyzed. The results indicated that the weld’s microstructure consisted of globular structure. In addition, porosities were found at the top of weld. However, minimum porosities were obtained from joints under argon shielding gas. The highest tensile strength was achieved from rotation speed at 1,110 rpm with welding speed at 120 mm/min under argon shielding gas with the value of 173 MPa. The joint efficiency was 86 % compared to the base metal.

• Periodical: Key Engineering Materials (Volume 658)
• Pages: 146-150
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.658.146
• Online since: July 2015
• Authors: Atsadawoot Geaowdee, Prapas Muangjunburee*
• Keywords: Semi-Solid Metal, Semi-Solid State Joining, SSM A356

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