Method,Purpose,Strength,Reusability,Heat Input,Typical Use Case
Tack Welding,Temporary or semi-permanent hold before final weld,Medium,Adjustable,Moderate,"Sheet-metal, frames, pipe assemblies"
Spot Welding,Permanent bond using pressure and current,High,Non-reversible,High (localized),"Automotive panels, appliance housings"
Clamping / Fixtures,Mechanical positioning without fusion,None,Fully reusable,None,"Prototyping, precise setup, pre-fit holding"