Parameters of the polymeric materials ultrasonic welding

It was established that the mode parameters determining efficiency of the plastics ultrasonic welding process include waveguide oscillation amplitude, welding static pressure, oscillation frequency, welding time and size of the fixed gap between the waveguide working end and the support. In each specific welding mode, an increase in the gap of more optimal value leads to a decrease in the breaking load; this is especially true in welding products of higher thickness. Welding could be performed on surfaces coated with various products. An expression was obtained to determine time and intensity coefficients of the ultrasonic welding mode. Fixture supports influence on quality and strength of the welded joints in the ultrasonic welding of polymeric materials was considered. When using an active support, strength and productivity of ultrasonic welding was much higher than in using the passive supports. Results of the experiments confirmed the relationship between the support oscillations amplitude and the heating, thickness and properties of the parts to be welded. A working cycle of the plastics ultrasonic welding is proposed, where the static welding pressure and the ultrasonic pulse time are ensuring maximum strength and tightness of the welded joint.

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