Improvement Butt Weld of SSM aluminum alloys by Semi-solid State Joining

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ภัสพล บิลหร่อหีม ประภาศ เมืองจันทร์บุรี มูหามัด เต๊ะยอ

Abstract

This applied research aimed to improve butt weld of SSM aluminum alloy by using semisolid state
joining. Physical properties were studied, including macro and micro structures, as well as mechanical
properties of SSM 356 weld by semisolid state. Butt-joint of SSM356 was heated by induction heater. During
welding, temperature was controlled in the range of 580-590ºC. Samples were welded by portable drill tip stirring of 4 mm diameter. The stirring rate and welding speed were 1,750 rpm. and 75 mm./min, respectively. The elded specimens had 3 different conditions. Firstly, the 1st and 2nd conditions were welded under normal atmosphere in order to investigate which direction of drill could give the best mechanical properties of weld joints, clockwise and counter clockwise. Result showed that the clockwise direction provided slightly higher physical properties, macro/microstructure properties, and mechanical properties. Therefore the 3rd ondition was welded under sledding gas (nitrogen gas) with the same welding parameter of clockwise irection. The gas flow rate and gas temperature were 5 L/min and 300ºC, respectively. Then, the results withprevious experiment were compared under normal atmospheres. The results showed that welded sample under nitrogen gas (Tensile strength 121.7 MPa and Hardness 63.9 Hv(0.1)) gave better mechanical properties compared to the experiment under normal atmosphere (tensile strength 111.2 MPa and Hardness 63.2 Hv(0.1)).

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บทความวิจัย

References

Birbilis, N. & Buchheit, R.G. (2005). Electrochemical Characteristics of Intermetallic Phase in Aluminum
Alloys. Journal of the Electrochemical Society, 152(4), 140-151.

Binrohim, P & Muangjunburee, P. (2015). Improvement of Semi-Solid State of SSM Aluminum Alloys. The 30th
Conference of Mechanical Engineering Network of Thailand, Prince of Songkla University. (in Thai)

Jung, B., Lee, H., & Park H. (2013). Effect of grain size on the indentation hardness for polycrystalline meterials
by the modified strain gradient theory. International Journal of Solid and Structure, 50, 2719-2724.

Merlin, M & Garagnani, G. (2009). Mechanical and microstructure characterization of A356 casting realized
with full and empty cores. Metallirgical Science and Technology, 27(1), 21-30.

Muangjunburee, P. (2012). Welding Engineering. Songkla: Education Technology, Faculty of Engineering,
Prince of Songkla University. (in Thai)

Panneerselvam, K & Lenin, K. (2014). Joining of Nylon 6 plate by friction stir welding process using threaded
pin profile. Materials and Design, 53, 302-307.

Petkhwan, A., Muangjunburee, P & Wannasin, J. (2014). Investigation of microstructure and mechanical properties
of semi-solid state joining SSM aluminum alloys. Mechanics and Materials, 496(500), 371-375.

Threadgill, P.L., Leonard, A.J., Shercliff, H.R & Withers, P.J. (2009). Friction stir welding of aluminum alloys.
International Review, 54(2), 49-93.

How, Q., Mutharasan, R. & Kozal, M. (1995). Feasibility of aluminum nitride formation in aluminum alloys.
Materials of Science and Engineering.

Saisang, C., Makklang, A & Kongtrakul, W. (2011). Welding Metallurgy. Bangkok: Se-education.
Sikon, L. (2008). Materials Engineering. Songkla: Education Technology, Faculty of Engineering, Prince of
Songkla University. (in Thai)

Wanasin, J & Thanabumrungkul, S. (2008). Development of a Semi-Solid metal processing technique for
aluminium casting application. Songklanakarin Journal of Science and Technology, 30(2), 215-220.

Wanasin, J., Burapa, R & Canyut, R. (2009). Improvement of aluminum A356 Casting by GISS process.
7th Engineering Conference, Prince of Songkla University. (in Thai)