Electrode Classification Flashcards

Electrode Classification Overview

• F1 group electrodes: EXX20, EXX24, EXX28, EXX27; unique for having "2" in the second to last position.
• F2 group electrodes: EXXX2, EXXX3, EXXX4; characterized by specific functionalities.
• F3 group last numbers: EXXX0 & EXXX1; indicating their classification.
• F4 group last numbers: EXXX5, EXXX6, EXXX8; defining their type within the classification system.

Electrode Characteristics

• F1 characteristics include limited position usage and increased deposition rates.
• F2 characteristics are defined by easy slag removal, easy starts, a soft arc, and low penetration.
• F3 characteristics emphasize cellulose content for a digging arc; requires a "whip and pause" technique; effective on poor fit-up.
• F4 characteristics highlight low hydrogen content, the need for baking to remove moisture, excellent ductility, medium penetration, and being the best all-around rod.

Electrode Classification Codes

• Last number in electrode classification refers to the current type and coating.
• Second to last number indicates the designed rod position for application:
  • "1": all positions (flat, horizontal, vertical, overhead)
  • "2": limited positions (flat and horizontal)
• For electrodes with five numbers, the first three denote tensile strength multiplied by 1,000.
• For electrodes with four numbers, the first two also denote tensile strength multiplied by 1,000.

Mechanical Properties

• Tensile strength: stress caused by opposing forces acting on the same axis, pulling an object apart.
• High cellulose content results in a digging arc, enhancing penetration.
• High potassium content acts as an arc stabilizer.
• High iron powder content increases the rate of deposition.

Electrical Characteristics

• Current requirements for significant electrodes include:
  • 6010: DCEP only
  • 7018 & 7028: AC & DCEP
  • 6011: AC & DCEP
  • 7014 & 7024: AC, DCEP, and DCEN

Electrode Types and Usage

• 6013 is known as the "farmer's rod," versatile for various applications.
• 7018 is the only low hydrogen electrode containing iron powder.
• F3 group requires a "whip and pause" technique for effective welding.
• F1 group is limited to flat and horizontal positions only.
• F2 group provides a smooth and steady arc with lower penetration.
• F4 group requires baking to eliminate moisture before use.

Electrode Classification Specifics

• EXXYZ format indicates:
  • Y: welding position: "1" for all positions, "2" for flat and horizontal only, "4" for all positions with vertical down.
  • XX: tensile strength expressed as a two or three-digit number multiplied by 1,000 psi.
  • E: indicates use for Electric Arc Welding.

Polarity and Position Requirements

• DCEP: Direct Current Electrode Positive (reverse polarity).
• DCEN: Direct Current Electrode Negative (straight polarity).
• Electrode polarity is determined by the consumable rod used.
• For E7024, the #2 indicates limited position usage (flat/horizontal).
• For E7016, the #1 indicates usability in all positions, including vertical up.

Classification and Material Content

• An electrode with rutile (titania)/potassium content ends with F2 classification numbers (2, 3, 4).
• High iron powder content specifically correlates to increased deposition rates in welding applications.

Test your knowledge of electrode classification with these flashcards. Each card provides a specific electrode group and its defining characteristics. Perfect for students and professionals in the electrical engineering field.