___________ is a solid state welding process in which coalescence is effected by high-velocity movement together of the parts to be joined produced by a controlled detonation.

Correct option is B

Explosion welding is a solid-state welding process where two surfaces are joined together by a high-velocity impact caused by a controlled detonation of explosives. This process is typically used to join dissimilar metals.
Important Points:
· Explosion welding produces a metallurgical bond without melting the base metals.
· It is commonly used to produce clad materials like stainless steel-clad carbon steel.
· Applications include pressure vessels and heat exchangers.
· Other solid-state welding methods: friction welding, ultrasonic welding, and diffusion welding.