Hybrid bonding makes it possible to take advantage ofthe mechanical and processing characteristics of different joining techniques, to improve the quality of the joint, and to join specific materials and material combinations.
When high-strength adhesives are used, the adhesive bond usually takes the greatest share of the mechanical load under service conditions. The mechanical fastener or spot-weld then takes the role of an initial fixation aid, and may serve to
Figure 6.27 Die-cut pressure-sensitive adhesive (PSA) films for surface bonding. (Photo courtesy of Ellsworth Adhesives). |
avoid peel stresses near the edge of a joint or long-term static stresses. Examples of successful hybrid bonding include the combination of bonding with spot-welding, riveting or clinching. Bonding combined with riveting is used primarily in the aircraft industry, where the joints are expected to have a high level of fatigue resistance and dynamic mechanical stress.
6.3.2