Question

identify the type of drive roll shown:

v-groove
u-groove
u-cogged
v-knurled

Explanation:

Identify the component and markings

The image shows a wire feeder drive roll used in gas metal arc welding (GMAW) or flux-cored arc welding (FCAW). Looking closely at the markings stamped on the side of the drive roll, we can read the text "V-KNR" or "V-KN" along with the wire size (0.045 / 1.2mm). The abbreviation "V-KNR" or "V-KN" stands for "V-Knurled".

Analyze the drive roll groove design

Using the Wire Feeder knowledge point, we know that different wire types require specific drive roll groove profiles to feed smoothly without slipping or crushing the wire:

• V-groove rolls are smooth and used for solid steel wires.
• U-groove rolls are smooth and rounded, used for soft wires like aluminum to prevent deformation.
• V-Knurled (or knurled V-groove) rolls have teeth or ridges inside the groove to grip tubular, flux-cored, or metal-cored wires, which are softer and require more traction without excessive tension.

Match with the options

The stamped marking on the drive roll clearly indicates "V-KNR" (V-Knurled), which matches the fourth option: "V-Knurled".

Answer:

• (A) V-groove
• (B) U-groove
• (C) U-cogged
• (D) V-Knurled (Correct answer)