The potential difference that brought its measure lies the 16 v and the value at 360 Hz after the measurement the signal bar and Zen then kahao. comparison of a signal with the sensor bar kahao residual stress value measured by the coefficient พัธ์? The study found that at each point that made the flat surface of the stainless steel AISI 440 C, then after measuring residual stress from the X-ray diffraction to have residual stress at the surface, the greater the pressure-based actions into the process rolling. 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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