Definition

Noun: 1. A type of butt welding process: Flash welding is a resistance welding process that joins two metal pieces end-to-end. An electric current is passed through the workpieces, and they are brought together lightly. This creates an electric arc (or "flash") at the interface, which heats the metal to a molten state. The pieces are then forced together (forged) under pressure to complete the weld.

Usage

• General Use: The term is used specifically in industrial, manufacturing, and engineering contexts to describe this precise welding technique.
  • Flash welding is commonly used for joining railway rails.
  • The pipeline segments were connected using flash welding.

Advanced Usage

• Technical Specification: In technical documentation, the process parameters (such as current, flashing time, and upset force) are often specified.
  • The procedure calls for flash welding with an upset force of 60 kN.

Variants and Related Words

• Flash butt welding: A full, synonymous term for the same process.
• Upset welding: A closely related resistance welding process, but without the intentional flashing action; the parts are held together under pressure from the start of the current flow.

Synonyms

• Flash butt welding: The most direct synonym.
• Resistance butt welding: A broader category that includes flash welding.

Related Phrases/Idioms

(This term is a technical compound noun and is not typically used in idiomatic expressions or phrasal verbs.)

Noun

1. butt welding by creating an electric arc between the two pieces which melts and joins them; used for joining segments of metal pipe