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Feeding force

The force needed to push the wire through a liner and torch – is related to feeding stability. This force depends on many factors, such as type and length of the liner, curves in the cable assembly and curves in the welding torch, and also on the surface of the wire.

Feeding force at different wire speeds

The figure above shows the feeding force measured in a standardised set-up for OK AristoRod™ and copper coated wire for two wire diameters. It can be seen that the feeding force is not only lower for AristoRod™, but also that variation is substantially smaller, indicating more stable feeding conditions.

Feeding force and vibration theory

The graph above shows what happens when copper coating particle contamination clogs the wire feed system. The feeding force increases gradually beyond the level where the wire will continually slip. The arc will become very unstable and finally the wire burns back to the contact tip. Not a single copper coated wire lasted the full 330 minutes of welding. Tests had to be abandoned because of burnback, some after just 8 minutes.

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