Podcast
Questions and Answers
What is the primary process used in arc welding?
What is the primary process used in arc welding?
Which of the following welding processes uses a consumable electrode?
Which of the following welding processes uses a consumable electrode?
Identify the arc welding process that is most widely used worldwide.
Identify the arc welding process that is most widely used worldwide.
Which of the following is NOT a fusion welding process?
Which of the following is NOT a fusion welding process?
Signup and view all the answers
What type of electric current can be used in Shielded Metal Arc Welding (SMAW)?
What type of electric current can be used in Shielded Metal Arc Welding (SMAW)?
Signup and view all the answers
What is the primary purpose of the flux coating in Shielded Metal Arc Welding?
What is the primary purpose of the flux coating in Shielded Metal Arc Welding?
Signup and view all the answers
What happens to the electrode during the welding process in SMAW?
What happens to the electrode during the welding process in SMAW?
Signup and view all the answers
Which equipment is primarily used to convert alternating current into direct current for SMAW?
Which equipment is primarily used to convert alternating current into direct current for SMAW?
Signup and view all the answers
What is the voltage range typically supplied by the transformer in SMAW?
What is the voltage range typically supplied by the transformer in SMAW?
Signup and view all the answers
In SMAW, what effect does straight polarity have on the penetration of the weld?
In SMAW, what effect does straight polarity have on the penetration of the weld?
Signup and view all the answers
Which type of welding joint joins two members aligned in the same plane?
Which type of welding joint joins two members aligned in the same plane?
Signup and view all the answers
What is a defining characteristic of a Tee Joint in welding?
What is a defining characteristic of a Tee Joint in welding?
Signup and view all the answers
What is the role of a step-down transformer in the SMAW process?
What is the role of a step-down transformer in the SMAW process?
Signup and view all the answers
What defines a corner joint in welding?
What defines a corner joint in welding?
Signup and view all the answers
Which welding safety rule is essential to prevent electrical shock?
Which welding safety rule is essential to prevent electrical shock?
Signup and view all the answers
What is the correct sequence when starting an electric arc in welding?
What is the correct sequence when starting an electric arc in welding?
Signup and view all the answers
What type of joint is formed between the edges of two or more parallel members?
What type of joint is formed between the edges of two or more parallel members?
Signup and view all the answers
Which of the following items is NOT recommended for welding safety attire?
Which of the following items is NOT recommended for welding safety attire?
Signup and view all the answers
Why is it crucial to ensure the welding area is free of flammable materials?
Why is it crucial to ensure the welding area is free of flammable materials?
Signup and view all the answers
What is the purpose of using a chipping hammer after welding?
What is the purpose of using a chipping hammer after welding?
Signup and view all the answers
What is the initial step in the welding procedure after marking the work pieces?
What is the initial step in the welding procedure after marking the work pieces?
Signup and view all the answers
Study Notes
Arc Welding Experiment
- The aim of the experiment is to study arc welding and weld mild steel plates with various joints.
- Arc welding is a process that fuses two or more metal pieces together using heat from an electric arc welding machine.
- The arc is created between the electrode and the metal, then heats the metal to its melting point.
- The electrode is then removed, allowing the molten metal to cool and solidify.
Basics of Arc Welding
- The arc welding process involves the use of electrodes and a welding machine.
- Consumable and non-consumable electrodes are used.
Fusion Welding Processes
- Consumable electrode processes include SMAW (Shielded Metal Arc Welding), GMAW (Gas Metal Arc Welding), SAW (Submerged Arc Welding), and Oxygen/Fuel Welding.
- Non-consumable electrode processes include GTAW (Gas Tungsten Arc Welding), PAW (Plasma Arc Welding), Electron Beam Welding, and Laser Beam Welding.
Shielded Metal Arc Welding (SMAW)
- Common name is "stick" or manual arc welding
- Widely used in various welding applications
- Used on most common metals and alloys
- Employes alternating current (AC) or direct current (DC).
- Current flows through the electrode cable to the holder and through the electrode to the arc.
- Current flows through the base metal to the work clamp, then to the welding machine.
Core Rod (Metal Filler)
- A consumable part of the welding process.
- Carries the welding current.
- Becomes part of the weld.
Flux Coating
- Produces a shielding gas to protect the weld area from contamination.
- Provides additional filler material.
- Forms a slag (protective layer).
SMAW Equipment
- Uses a step-down transformer to reduce voltage and increase current, resulting in a constant current output.
- Constant current output ensures consistent heat, even with fluctuating arc distance and voltage changes
SMAW - DC Polarity
- Straight Polarity ( + to electrode, - to work piece): shallow penetration (thin metal)
- Reverse Polarity ( - to electrode, + to work piece): deeper penetration (thicker metal)
- AC(Alternating Current): produces pulsing arc beneficial for welding thick sections.
AWS Classification of SMAW Electrodes
- E70XX: A common designation of electrodes, with tensile strength and welding position characteristics. Specific examples are included in the presentation.
Welding Equipment
- Key components of welding equipment are described with diagrams and numbered labels for easy identification and understanding for the students.
Welding Joints
-
Butt, Corner, Lap, Tee, and Edge are the main welding joint types. Diagrams illustrate each type.
-
For example, butt joints connect members in the same plane.
Welding Procedure (General Steps)
- Clean the metal surfaces prior to welding.
- Mark lines on the work pieces using a steel rule and scriber.
- Keep the work pieces together according to the marking on the metal table.
- Clamp the work pieces on the metal table for rigidity.
- Set the current as required
Weld Procedure
- Insert the correct electrode in the electrode holder
- Bring the electrode straight down to the work piece and lift slightly to initiate the arc.
- Hold the electrode perpendicular to the work piece and move at a uniform speed.
- Use a chipping hammer and a wire brush to remove the slag.
Arc Welding Safety Rules
- Never allow any part of the body to touch electrical circuits.
- Do not harm wiring/clamp/machine elements
- Weld on a dry surface
- Use appropriate eye protection.
- Use appropriate personal safety equipment (gloves, apron, clothing).
- Ensure the working area is free of flammable materials.
- Always guard your face and eyes when chipping slag.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Related Documents
Description
Test your knowledge of arc welding processes and techniques with this informative quiz. Covering essential topics like Shielded Metal Arc Welding (SMAW) and various welding joints, it helps reinforce your understanding of welding principles. Perfect for anyone studying welding or looking to enhance their skills!
