Technical definition
- Helix and Cast
As can be seen from the formula, the axial displacement (known as the Pitch or Helix) is determined by the diameter of a Cast and the diameter of the wire.
When freely turning, the following conditions must be met for there to be considered no residual voltage in wires with a diameter less than 5.00 mm:
- Necking
This is the reduction of the area at the breaking point, calculated as the ratio between the final and initial sections, expressed as a percentage.
- Torsion
This is determined by the number of times a wire can be twisted back on itself before breaking.
- Bending
Based on certain bend angle and bend radius parameters, the test determines the number of times the wire can be bent (at least) before breaking.
90° and 180° bent wire
- Ovality
This is a determining factor in the shape of round wires and it is indicative of the uniformity of the diameter.
This is in addition to the diameter tolerance.
shows a section of wire with ovality.
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