Electrode extension is defined as the distance between the contact tube and the end of the wire electrode.

Electrode extension is defined as the distance between the contact tube and the end of the wire electrode.

• A. The Distance Between the End of the Electrode and the Weld Metal
• B. The Distance Between the Gas Nozzle and the Work
• C. The Distance Between the Contact Tube and the End of the Wire Electrode
• D. The Distance Between the Contact Tube and the Work

Answer: (C)

Electrode extension, or stick-out, is the length of wire that projects beyond the contact tip into the arc. This distance determines how current transfers from the wire to the weld and how stable the arc and heat input will be. If the extension is too short, the tip can overheat and burn back into the nozzle, causing tip fusion and unstable transfer. If it’s too long, the arc becomes unstable, the welding voltage and heat distribution change, penetration can drop, and spatter may increase. Maintaining the recommended extension helps keep the arc stable and the weld quality consistent. The definition described—distance from the contact tube to the end of the wire electrode—matches this concept.

Electrode extension, or stick-out, is the length of wire that projects beyond the contact tip into the arc. This distance determines how current transfers from the wire to the weld and how stable the arc and heat input will be. If the extension is too short, the tip can overheat and burn back into the nozzle, causing tip fusion and unstable transfer. If it’s too long, the arc becomes unstable, the welding voltage and heat distribution change, penetration can drop, and spatter may increase. Maintaining the recommended extension helps keep the arc stable and the weld quality consistent. The definition described—distance from the contact tube to the end of the wire electrode—matches this concept.