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