Jumat, 26 April 2013
Kamis, 18 April 2013
final project
EFFECT OF HEATING AT 400 AND 430OC
FOR 5 AND 15 MINUTES ON FRICTION STIR WELDING JOINTS OF Al-Si ADC12 AND AC4C
ALLOYS
Abdul Muchlis
Student of Mechanical Engineering
at University Gunadarma
Friction stir welding is a joint technique for
material in solid phase condition.
Friction stir welding has usually done for aluminium because it is the easiest of joint
technique for metals. Materials used in
this research are hypoeutectic Al-Si ADC12 and AC4C alloys and welding tool is High Speed Steel (HSS). ADC12 has 11.86% Si
and AC4C have 7.11% Si. Friction stir welding was done for 1 pass with rotation
welding tool of 1200 rpm and speed of motion of 5-7 mm/minutes. Macrostructure and microstructure of
both alloys were observed in this study following by hardness testing. The
welding joints of both Al-Si alloy consisted of stir zone, thermomechanical
affected zone either in retreat and advance sides and base metal. The stir zone
of Al-Si ADC12 has Al-α and fine particle Si, is smaller than Al-Si AC4C. ADC12
and AC4C after friction stir welding were heating at 400 and 4300C
for 5 and 15 minutes. A lot of porosities were found at ADC12 joint whereas on
AC4C a few porosity. Microstructure of this aluminium alloy after heating with
400oC become bigger. Whereas
430oC shown particle Si more large and rough. It few
interval time of heating so particle
silicon is larger. The heating with 430oC at ADC12 was occured fail
of material, whereas at AC4C is fine. Hardness of material Al-Si at base metal,
stir zone,heat affected zone and termomechanically affected zone. Heating made
the stir zone of Al-Si ADC12 became harder at 400oC for 15 minutes.Heating
made the stir zone of Al-Si AC4C became harder at 400oC for 15
minutes.
Rabu, 17 April 2013
Senin, 15 April 2013
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