In order to further investigate the influence of UIT on the surface compact stress of Ti alloy welding
beams,the UIT treatment with different working currents and working hammers on the Ti alloy welding sheets of differ鄄
ent thickness were carried out. The results showed that compact stress is related to impact hammer style and working
current, and the stress is linear with the working current. The fitting straight line had a good response to the relation
between the compact stress and working current. According to the experiment results,it is found the UIT can not only
create compact stress on the welding beams and hot鄄affected zone which is good for the welding parts, and different
compact stress values can be obtained by controlling the UIT parameters.