Functional Materials and Advanced Manufacturing

176 Characterization, Testing, Measurement, and Metrology

to softening and proper consolidation of the BM with ne grain due to continuous

recrystallization at level 3, 4.This results in defect-free joint with better UTS.

10.12 EFFECT OF WELDING SPEED ON UTS

The effect of welding speed with respect to UTS is depicted in Figure 10.9. It can be

observed from Table 10.10 that ultimate tensile strength increases when the welding

speed is increased from 1 to 2 levels. UTS decreases when welding speed is increase

from 2 to 3 levels, and further, UTS is increased with increasing the welding speed

from level 3 to level 4.

Welding speed mostly affects mechanical properties due to the heat generated in

FSW process. Slow welding speed would cause ...