Questions and Answers
The F1 group are which electrodes?
The F2 group are which electrodes?
F3 last numbers are?
F4 last numbers are?
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What are the characteristics of F1?
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What are the characteristics of F2?
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What are the characteristics of F3?
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What are the characteristics of F4?
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What does the last number in electrode classification refer to?
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What does the second to last number in the electrode classification refer to?
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What do the first three numbers represent in an electrode with five numbers?
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What do the first two numbers represent in an electrode with four numbers?
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What is tensile strength?
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How does high percentages of cellulose affect the weld?
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How does high percentages of potassium affect the weld?
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How does a high percentage of iron powder affect the weld?
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What is the current requirement for the 6010 electrode?
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What is the current requirement for the 7018 & 7028 electrodes?
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What is the current requirement for the 6011 electrode?
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What is the current requirement for 7014 and 7024?
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Which rod is considered the farmers rod?
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What is the only low hydrogen electrode that contains iron powder?
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What F group requires a 'whip and pause' technique?
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What F group is limited to flat and horizontal only?
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Which electrode has a smooth and steady arc but less penetration?
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What is the F group that requires baking to draw out moisture?
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In EXXYZ, what does Y stand for?
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In EXXYZ, what does XX refer to?
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In EXXYZ, what does E stand for?
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What does DCEP stand for?
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What does DCEN stand for?
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What determines the polarity in the SMAW process?
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In E7024, what dictates the position the weld should be used in, which positions are they?
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In E7016, what dictates the position the weld should be used in, which positions are they?
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In E7044, what dictates the position the weld should be used in, which positions are they?
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What polarities are used for the E7018 process?
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What polarities are used for the E7028 process?
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What number in E7024 dictates the position the weld should be used in?
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What number in E7016 dictates the position the weld should be used in?
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What number in E7044 dictates the position the weld should be used in?
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An electrode with rutile (titania)/potassium content ends with which numbers?
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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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