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CHOOSING THE RIGHT DRIVE ROLL
The three types of drive rolls most commonly used for wire welding processes are V-knurled, V-groove and U-groove.
- V-knurled drive rolls are used with gas- and self-shielded flux-cored and metal-cored wires that are softer due to the flux inside and the tubular design. This type of drive roll has teeth to dig into the wire and help push it through the feeder drive system and gun cable. V-knurled drive rolls are not typically used with solid wire and may cause shavings to break off the wire. Those shavings can clog the liner and negatively impact wire feeding.
- V-groove drive rolls are normally used with solid wire. The extra push provided by V-knurled drive rolls is not needed with solid wire, which is stiffer and tends to feed better through the liner.
- U-groove drive rolls are designed for use with aluminum wires or other very soft materials. When using soft wires such as aluminum, it’s important to avoid marring the wire surface or deforming or mashing the wire. A U-groove drive roll helps to feed the wire through the liner while still keeping the wire’s round shape.