Wire annealing

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The Drahtglühe is an apparatus in the cold worked wires again by high temperature annealed be.

Working principle

The drawing process in the cold forming process causes the wire to become very brittle and hardened, which increases tensile strength and elongation at break and electrical conductivity. The necessary properties are restored by an annealing process after wire drawing. When annealing, the wire is heated to up to 300–600 degrees Celsius, and the wire is often guided in a protective atmosphere to prevent oxidation .

Glow types

The best known types of annealing for wires are contact annealing and induction annealing . With contact annealing, the wire is guided over two contact rollers, on which a voltage is applied. This causes an electric current to flow in the wire, which heats it up.

The induction glow works according to the transformer principle . The wire runs in a loop over two contact rollers, which are electrically connected to one another, and is thereby short-circuited to form a ring. In this loop, electrical coils are arranged around the wire, which induce a current in the wire loop via a high-frequency voltage. This in turn heats the wire.

Individual evidence

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