TWI

Friction stir welding (FSW) has been used to weld aluminum alloys such as 7075 to 7075, which is considered not weldable by most other methods. In this application FSW was used to join two dissimilar aluminum alloys 7075 and 6N pure copper in a lap weld configuration. The microstructure, bond strength, and composition were examined in the stir zone which contains both Al7075 and copper. The FSW process produces a weld that is partitioned into very distinct AA7075 and copper regions and resembles a layered or onion bondline between the two. The results suggested that FSW dissimilar materials causes mechanical mixing of the two materials and mutual diffusion would occur slightly between the interfaces. The application of FSW to sputtering target manufacturing was demonstrated for the first time between these two materials.

8th International Symposium, 18-20 May 2010, Poster Session, Paper 08