Brief description

Wire is a single, usually cylindrical, flexible strand or rod of metal. It is formed by drawing the metal through a hole in a die or draw plate.

Use / Function

Conduction: Essential for electricity transmission (especially copper).
Construction: Binding, fencing, and structural support.
Manufacturing: Needles, springs, and jewelry.
Mechanisms: Cables for suspension bridges or pulleys.

Operating principle

It relies on the property of ductility: the ability of a material to deform under tensile stress (being pulled) without fracturing. By forcing the metal through a smaller hole, the crystal structure elongates, making the wire longer and thinner.

How to create it

Prepare the Rod: Forge or cast the metal into a thin rod or strip.
Anneal: Heat the metal to soften it (as working it hardens it).
Draw: Pull the rod through a “draw plate” – a hard plate (stone or harder metal) with a tapered hole.
Repeat: Pull it through successively smaller holes until the desired thickness is reached.
Re-anneal: If the wire becomes too brittle during the process, heat it again.

Materials needed

Ductile Metal: Copper, gold, and silver are the easiest to work with. Iron and steel require more force.
Draw Plate: A plate made of a material harder than the wire (hardened steel, diamond, or hard stone).
Lubricant: Fat or wax to reduce friction during drawing.
Tongs/Pliers: To grip and pull the wire.

Variants and improvements

Stranded Wire: Several thin wires twisted together (like rope) for better flexibility.
Barbed Wire: Wire with sharp points for fencing/defense.
Magnet Wire: Copper wire coated with a thin layer of insulation (enamel) for use in coils.

Limits and risks

Work Hardening: Drawing metal makes it hard and brittle; without annealing, it will snap.
Capacity: Thin wires can melt if they carry too much electrical current (acting as a fuse).
Corrosion: Iron wire rusts quickly if not galvanized or coated.