Voltage and frequency values selected it as a best value because the value that caused the change of the magnetic field enough to signal that the sensor bar, it Temple kahao has the relationships to the same trends in the value of the residual stress too. The signal out of the areas that have high residual stress value, it will have the value of the signal bars but the lower sensor kahao in areas with low residual stress value, it will have a higher bar signal sensor kahao.
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