Measurement of vibration transmitted through welded object and welding strength in ultrasonic welding

Abstract Ultrasonic welding of plastics has been used in a wide range industries and improving quality production speed are still important issues. This paper introduces method to evaluate the condition during welding. In this method, vibrations propagated were acquired using piezoelectric element. By fast fourier transform analysis, tracking calculation data, total harmonic distortion with time was obtained. The can be determined by comparing strength against obtained from 180° peeling test. As result, it found that vibration characteristics indicate completion welding, making possible efficiently weld.