This research aims to study the influence of variables that affect the mechanical properties of aluminum semi-solid casting SSM 7075 by Spot Friction Welding. At speeds of 380, 760, 1240 and 2500 rev / min and the time of the infusion of 60, 90 and 120 seconds, the study found that the physical side surface on the welds in all conditions on the harmonization welds. And at the base of the welds have good penetration. No cracks, no harmonization of the welds. The speed at around 2500 found that physical appearance. On the front surface of welds in all conditions, the harmonization bad welds. And at the base of the weld penetration is poor. Cracks found no harmonization of the welds. And found that the process friction points that can increase hardness. And the strong pull The hardness of the workpiece by means of friction points with an average of approximately 115.18 HV hardness, which is higher than the original metal accounted for 27.7% compared to the same metal. (Stiffness of metal the average of 90.2 HV) the conditions that give maximum hardness is the speed at 1240 rev / min and time in the freezer for 90 seconds, the tensile strength of the workpiece by means of friction model. The highest average value of about 194.20 MPa and conditions that provide the tensile strength is the maximum speed of 2500 rev / min and time in the freezer for 90 seconds, the study concluded that process friction points that can improve the mechanical properties. The casting of aluminum semi-solid.
การแปล กรุณารอสักครู่..