What can cause deterioration of the electrodes?

• A. Alloying between the electrode tips and the work
• B. Excessive cooling of the electrode
• C. Increase in welding current only
• D. Proper electrode maintenance

Answer: (A)

Electrode deterioration mainly comes from material transfer at the interface where the electrode tip meets the work. When the arc melts metal from the base plate and the tip sits at high temperature, atoms from the workpiece can diffuse into the electrode tip and form alloys. That alloying changes the tip’s composition and surface properties, causing the electrode to wear more quickly, destabilizing the arc, and increasing contamination of the weld. In short, the coating and tip become altered by interaction with the work, leading to faster consumption and poorer performance of the electrode.

Excessive cooling of the electrode can affect the coating and arc behavior, but it isn’t the primary mechanism of deterioration. Increasing welding current alone speeds up heat input and electrode consumption, but it doesn’t inherently cause the same kind of tip alloying problem. Proper electrode maintenance, on the other hand, helps prevent deterioration by keeping surfaces clean and coatings intact.