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Apart from being a very efficient heat source friction provides an effective cleaning action. Various foreign inclusions, surface oxides and absorbed films that oppose formation of bonds are destroyed & removed by abrasion produced by frictionHence the bonding or welding is stronger. Here is a further list of advantages of friction welding:

Fine-grained structure that cannot be obtained through other welding processes
Very high static strength
The welds are leak-tight
Minimal Heat Affected Zone (HAZ)
Short welding times facilitate improved efficiency
The rotation symmetric heat application, hence high dimensional accuracy.
Autogenous – No filler material used, the process solely relies on inter-molecular bonding with the original material
Machine controlled process, complete automation including error rectification
Parameter monitoring and controlling possible
Independent of operator skill or attitude.
Joint preparation
Low energy & power requirements
3Ø load on motor & cosψ ≈ 0.85 for arc & flash cosψ ≈ 0.4 to 0.6
No special power supplies required
No objectionable smoke, fumes or gases, or weld spatter, hence extremely safe conditions
No consumables, no fluxes
No solidification defects
Dissimilar metals welded. e.g. Al-Cu, Al-Steel
2-100 times faster than conventional welding
Superior to other welding methods from Technical & Economical perspective
Unusually high efficiency coefficient
Simplifies manufacture of complex forging, saves expensive materials