ULTRASONIC WELDING METHOD, STRUCTURE WELDED BY ULTRASONIC WELDING METHOD, AND ULTRASONIC WELDING DEVICE

摘要

A pair of thermoplastic resin materials are placed on an anvil, and a pressing force is applied to the upper surfaces of the pair of thermoplastic resin materials from a tool horn that vibrates ultrasonically in a direction that is along and not perpendicular to said surfaces. As a result of the application of the pressing force from the tool horn that vibrates ultrasonically, areas around the upper surfaces of the pair of thermoplastic resin materials melt, which results in the formation of a welded structural part on top of a non-welded structural part. Then, the pair of thermoplastic resin materials are welded to each other and an overlapping structure is obtained in which the welded structural part is formed on top of the non-welded structural part. The positional relationship and space between the pair of thermoplastic resin materials do not change before and after the welding, and the surfaces of the thermoplastic resin materials on the anvil side do not get burned or change color.