What is the Annealing Test for Wires and Conductors ?

What is the Annealing Test for Wires and Conductors ?

Annealing Test Definition

The annealing test is performed to ensure the durability and flexibility of wires and conductors during twisting and bending.

Specimen Preparation

A specific gauge length of the conductor is used for the test, ensuring accurate results.

Testing Equipment

A tensile testing machine, micrometer, and measuring scale are essential for conducting the annealing test.

Elongation Measurement

The test measures the elongation percentage of the specimen after it fractures.

Process of annealing test for wires and conductors

A conductor specimen is selected for testing. It must be of a specified gauge length for accurate results. The total length includes the gauge length and extra lengths at both ends for holding in the tensile test machine.

A tensile testing machine is used, which is automatic and meets the test requirements. The machine must firmly grip the specimen. Additional tools include a plane-faced micrometer with 0.01 mm divisions and a measuring scale with 1 mm divisions. Only one specimen is needed, and no pre-conditioning is required. The specimen is fixed, and tensile stress is applied gradually until it fractures, with an elongation rate not exceeding 100 mm per minute.

The elongation is measured on the gauge length after the fractured ends have been fitted together. The elongation is expressed as a percentage of the original specimen gauge length. Main observation of annealing test for wires and conductors is that whether the specimen meets or does not meet the specified maximum allowed elongation. Plane Faced Micrometer with scale division at least 0.01 mm is used to measure the diameter of the specimen used in the test.

Calculation

Where, L = original gauge length of specimen

and L’ = elongated length of specimen

Result Reporting

The results indicate if the specimen meets the specified elongation requirements.