Permanent high-resistance assembly of structural elements

Nut & bolt assembly:
- assembly is cumbersome because it necessitates holding both the nut and the bolt during assembly
- risk of loosening, especially when the assembly is subject to vibration
- no possibility of locking the assembly
Arc welding:
- an inflexible welding process
- high level of material heating
- workpiece deformation
- scarcity of qualified arc-welders
- an unattractive solution (weld spots)