Answer :
Final answer:
Electron beam welding is not a solid-state welding process.
Explanation:
The process among the given options that is not a solid-state welding process is electron beam welding. In electron beam welding, a high-velocity beam of electrons is used to join materials together. This process does not involve the direct contact between materials, unlike friction welding, ultrasonic welding, and cold welding which all rely on the application of mechanical pressure or ultrasonic vibrations to achieve welds.
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