The effect of edge cutting on the plastics weldability in the ultrasonic welding

The paper systematizes shape and dimensions of the welded edges that satisfy the technological and aesthetic requirements. Correct selection of the cutting dimensions of the welded joint abutting edges makes it possible not only to avoid damage to the material under a waveguide, but also to significantly increase strength of the joint being created. The paper considers kinetic mechanism of the joint formation with the predominant penetration and melting during the plastics ultrasonic welding. It shows that cutting the joining edges during ultrasonic welding of the rigid plastics accelerates the working process. The paper establishes that the V-shaped cutting the product welded edges leads to an increase in the ultrasonic energy concentration on the abutting welded surfaces, as well as to predominant heat generation at the interface caused by an increase in the dynamic stresses level, which contributes to acceleration of the rigid plastics ultrasonic welding. Welded joints obtained by the melting scheme have higher strength characteristics than those obtained with introduction of the welded edges cutting along a joint. Edge cutting increases strength of the joint being created, improves its appearance and reduces time in the ultrasonic welding.
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