Electrode Classification Flashcards
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Questions and Answers

The F1 group are which electrodes?

  • EXX20, EXX24, EXX28, EXX27 (correct)
  • EXXX2, EXXX3, EXXX4
  • EXXX0 & EXXX1
  • EXXX5, EXXX6, EXXX8

    • The F2 group are which electrodes?

  • EXXX2, EXXX3, EXXX4 (correct)
  • EXX20, EXX24, EXX28, EXX27
  • EXXX5, EXXX6, EXXX8
  • EXXX0 & EXXX1

    • F3 last numbers are?

  • EXXX5, EXXX6, EXXX8
  • EXXX0 & EXXX1 (correct)
  • EXX20, EXX24, EXX28, EXX27
  • EXXX2, EXXX3, EXXX4

    • F4 last numbers are?

    <p>EXXX5, EXXX6, EXXX8</p> Signup and view all the answers

    What are the characteristics of F1?

    <p>Limited position, Increased deposition.</p> Signup and view all the answers

    What are the characteristics of F2?

    <p>Easy slag removal, Easy start, Soft arc, Low penetration.</p> Signup and view all the answers

    What are the characteristics of F3?

    <p>Cellulose (wood flour in flux), Digging arc, Requires 'whip and pause' technique, Good on poor fit-up.</p> Signup and view all the answers

    What are the characteristics of F4?

    <p>Low hydrogen electrodes, Requires baking to draw out moisture, Best ductility, Medium penetration, Best all-around rod.</p> Signup and view all the answers

    What does the last number in electrode classification refer to?

    <p>Current &amp; coating.</p> Signup and view all the answers

    What does the second to last number in the electrode classification refer to?

    <p>The position the rod was designed to run.</p> Signup and view all the answers

    What do the first three numbers represent in an electrode with five numbers?

    <p>Tensile strength multiplied by 1,000.</p> Signup and view all the answers

    What do the first two numbers represent in an electrode with four numbers?

    <p>Tensile strength multiplied by 1,000.</p> Signup and view all the answers

    What is tensile strength?

    <p>Stress caused by two equal forces acting on the same axis to pull an object apart.</p> Signup and view all the answers

    How does high percentages of cellulose affect the weld?

    <p>Creates a digging arc, increases penetration.</p> Signup and view all the answers

    How does high percentages of potassium affect the weld?

    <p>It is an arc stabilizer.</p> Signup and view all the answers

    How does a high percentage of iron powder affect the weld?

    <p>Increases deposition rate.</p> Signup and view all the answers

    What is the current requirement for the 6010 electrode?

    <p>DCEP only.</p> Signup and view all the answers

    What is the current requirement for the 7018 & 7028 electrodes?

    <p>AC &amp; DCEP.</p> Signup and view all the answers

    What is the current requirement for the 6011 electrode?

    <p>AC &amp; DCEP.</p> Signup and view all the answers

    What is the current requirement for 7014 and 7024?

    <p>AC &amp; DCEP &amp; DCEN.</p> Signup and view all the answers

    Which rod is considered the farmers rod?

    <ol start="6013"> <li></li> </ol> Signup and view all the answers

    What is the only low hydrogen electrode that contains iron powder?

    <ol start="7018"> <li></li> </ol> Signup and view all the answers

    What F group requires a 'whip and pause' technique?

    <p>F3.</p> Signup and view all the answers

    What F group is limited to flat and horizontal only?

    <p>F1.</p> Signup and view all the answers

    Which electrode has a smooth and steady arc but less penetration?

    <p>F2.</p> Signup and view all the answers

    What is the F group that requires baking to draw out moisture?

    <p>F4.</p> Signup and view all the answers

    In EXXYZ, what does Y stand for?

    <p>Welding Position (1 = All Positions; 2 = Flat and Horizontal ONLY; 4 = All positions, with vertical down).</p> Signup and view all the answers

    In EXXYZ, what does XX refer to?

    <p>Tensile strength (the two or three digit number times 1,000 psi).</p> Signup and view all the answers

    In EXXYZ, what does E stand for?

    <p>Used for Electric Arc Welding.</p> Signup and view all the answers

    What does DCEP stand for?

    <p>Direct Current Electrode Positive (DCRP - Reverse Polarity).</p> Signup and view all the answers

    What does DCEN stand for?

    <p>Direct Current Electrode Negative (DCSP - Straight Polarity).</p> Signup and view all the answers

    What determines the polarity in the SMAW process?

    <p>The consumable (the rod).</p> Signup and view all the answers

    In E7024, what dictates the position the weld should be used in, which positions are they?

    <p>#2 limited position (Flat/horizontal).</p> Signup and view all the answers

    In E7016, what dictates the position the weld should be used in, which positions are they?

    <p>#1 ALL positions (Vertical Up).</p> Signup and view all the answers

    In E7044, what dictates the position the weld should be used in, which positions are they?

    <p>#4 = All positions, with vertical down (the least common).</p> Signup and view all the answers

    What polarities are used for the E7018 process?

    <p>AC and DCEP.</p> Signup and view all the answers

    What polarities are used for the E7028 process?

    <p>AC and DCEP.</p> Signup and view all the answers

    What number in E7024 dictates the position the weld should be used in?

    <p>#2 limited position (Flat/horizontal).</p> Signup and view all the answers

    What number in E7016 dictates the position the weld should be used in?

    <p>#1 ALL positions (Vertical Up).</p> Signup and view all the answers

    What number in E7044 dictates the position the weld should be used in?

    <p>#4 = All positions, with vertical down (the least common).</p> Signup and view all the answers

    An electrode with rutile (titania)/potassium content ends with which numbers?

    <p>F2 classification # 2, 3, 4.</p> Signup and view all the answers

    Study Notes

    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.

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    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.

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