Abstract:The influence of pin length on the mechanical properties of dissimilar Al5754/ Al6111 friction stir
spot welds has been investigated. The mechanical properties show no obvious changes when the pin length increases
from 1. 6 mm to 2. 0 mm. However, the mechanical properties of spot welds improve a lot when the pin length increases
to 2. 2 mm, which is the basically caused by highly serrated hOOK profiles.