Course outline
Module 1
Module 1: Welding Safety and Protective Gear
Welding Safety and Protective Gear
Knowledge check
Q1. Which type of eye protection is essential when performing arc welding?
- A. Regular prescription glasses
- B. Welding helmet with the appropriate shade lens
- C. Safety glasses with clear lenses
- D. Sunglasses with UV protection
Q2. What is the primary purpose of wearing flame-resistant clothing while welding?
- A. To improve grip on the welding torch
- B. To keep the body warm in cold environments
- C. To protect the skin from sparks, spatter, and UV radiation
- D. To make the welder easier to see by others
Q3. Why should cotton or flame-resistant clothing be worn instead of synthetic materials like polyester?
- A. Synthetic materials are too heavy to move in
- B. Synthetic materials can melt and stick to the skin when exposed to heat and sparks
- C. Cotton is cheaper and easier to clean
- D. Synthetic materials conduct electricity more readily
Q4. What should a welder do before starting work to reduce fire hazards?
- A. Turn on a fan to blow away fumes
- B. Remove flammable materials from the work area and keep a fire extinguisher nearby
- C. Spray the workpiece with water
- D. Open all doors and windows completely
Q5. Why is adequate ventilation important when welding?
- A. It cools down the welding arc
- B. It prevents the electrode from sticking
- C. It removes harmful fumes and gases produced during welding
- D. It makes the weld bead stronger
Module 2
Module 2: Introduction to Welding Equipment
Introduction to Welding Equipment
Knowledge check
Q1. Which safety item should always be worn when welding to protect your eyes from arc radiation?
- A. Safety glasses with clear lenses
- B. A welding helmet with the correct shade lens ✓
- C. Sunglasses
- D. A face shield made of clear plastic only
Why: Arc welding produces intense ultraviolet and infrared radiation. A welding helmet with the correct filter shade protects the eyes from arc flash and burns, while clear glasses or sunglasses offer inadequate protection.
Q2. What is the primary purpose of shielding gas in gas metal arc welding (GMAW/MIG)?
- A. To cool the workpiece quickly
- B. To cut through thick metal
- C. To protect the molten weld pool from atmospheric contamination such as oxygen and nitrogen ✓
- D. To increase the electrical resistance of the wire
Why: Shielding gas, such as argon or CO2 blends, surrounds the molten weld pool and keeps atmospheric gases from reacting with the metal, which would otherwise cause porosity and weak welds.
Q3. Which component of a MIG welding setup feeds the consumable electrode wire into the weld joint?
- A. The ground clamp
- B. The regulator
- C. The wire feed unit ✓
- D. The flowmeter
Why: The wire feed unit (wire feeder) automatically pulls the spool wire through the cable and out the torch at a controlled speed, supplying the filler metal for the weld.
Q4. Why is the ground clamp important in an arc welding circuit?
- A. It regulates the gas pressure
- B. It cools the torch during welding
- C. It completes the electrical circuit back to the welding machine, allowing current to flow through the arc ✓
- D. It holds the workpiece in place for cutting
Why: The ground clamp connects the workpiece to the power source, completing the circuit. Without a proper ground connection, the arc cannot be established or sustained.
Q5. What does a regulator do on a shielding gas cylinder?
- A. It stores the gas at high pressure
- B. It mixes different gases together
- C. It reduces high cylinder pressure to a lower, usable working pressure ✓
- D. It filters moisture out of the gas
Why: Gas cylinders hold gas at very high pressure. The regulator steps this down to a stable, lower working pressure suitable for the welding process and equipment.
Module 3
Module 3: Understanding Metals and Materials
Understanding Metals and Materials
Knowledge check
Q1. Which metal is most commonly used in general-purpose welding projects because it is easy to weld and widely available?
- A. Stainless steel
- B. Mild steel ✓
- C. Aluminum
- D. Cast iron
Why: Mild steel, also called low-carbon steel, is forgiving to weld, inexpensive, and widely available, which makes it the standard choice for beginners and general fabrication work.
Q2. What is the main reason aluminum is harder to weld than mild steel?
- A. It is too hard to melt with any heat source
- B. It conducts heat very quickly and forms a tough oxide layer with a much higher melting point ✓
- C. It is always magnetic and resists the arc
- D. It cannot be joined with any filler metal
Why: Aluminum conducts heat rapidly, so it requires more heat input, and its surface oxide layer melts at a far higher temperature than the base metal, making fusion difficult without proper cleaning and technique.
Q3. What does the carbon content in steel primarily affect?
- A. The color of the metal surface
- B. The hardness and strength of the steel, which also influences weldability ✓
- C. The electrical resistance only
- D. The weight of the finished part
Why: Higher carbon content increases hardness and strength but also makes steel more prone to cracking when welded, so carbon level is a key factor in weldability.
Q4. Which property of stainless steel makes it resistant to rust and corrosion?
- A. A high copper content
- B. A chromium content of roughly 10.5% or more that forms a protective oxide layer ✓
- C. A coating of zinc on the surface
- D. A lack of iron in its composition
Why: Stainless steel contains at least about 10.5% chromium, which forms a thin, self-repairing chromium oxide film on the surface that protects the metal from rust and corrosion.
Q5. Why should you clean metal thoroughly before welding?
- A. To make the metal lighter in weight
- B. To remove paint, rust, oil, and oxides that can cause porosity and weak welds ✓
- C. To change the metal's melting point permanently
- D. To increase the metal's magnetic properties
Why: Contaminants like paint, rust, oil, and mill scale can release gases or prevent proper fusion, leading to porosity, inclusions, and weak welds, so clean surfaces are essential for sound joints.
Module 4
Module 4: Setting Up Your Workspace
Setting Up Your Workspace
Knowledge check
Q1. Why is it important to keep your welding workspace free of flammable materials?
- A. It makes the floor easier to sweep after a session
- B. Sparks and hot spatter can ignite nearby combustible materials and start a fire ✓
- C. Flammable materials reduce the electrical current of the welder
- D. It improves the color of the weld bead
Why: Welding produces sparks, slag, and spatter that can travel several feet and ignite paper, rags, solvents, or wood. Clearing the area of combustibles, or moving them at least 35 feet away when possible, is a core fire-safety practice.
Q2. What is the recommended minimum amount of ventilation when welding indoors?
- A. Only open a single small window
- B. Rely on a fan pointed at the wall
- C. Use local exhaust ventilation or general airflow that removes fumes from the breathing zone ✓
- D. Ventilation is unnecessary if you wear a cap
Why: Welding fumes contain metal oxides and other hazardous compounds. Effective ventilation, such as a fume extractor or exhaust hood, keeps fumes away from your breathing zone and protects your respiratory health.
Q3. Which type of fire extinguisher is most appropriate to keep within reach of a welding station?
- A. A Class A water extinguisher only
- B. A Class ABC dry chemical extinguisher ✓
- C. A decorative fire bucket filled with sand
- D. No extinguisher is needed if the shop has smoke detectors
Why: A Class ABC dry chemical extinguisher handles ordinary combustibles, flammable liquids, and electrical fires, which are all hazards around a welding station. Smoke detectors warn you but do not put out fires.
Q4. Why should the work surface be made of or covered with fire-resistant material?
- A. Fire-resistant surfaces make the weld cool faster
- B. Hot metal and spatter can fall onto the surface and smolder or ignite unprotected materials ✓
- C. It prevents the workpiece from conducting electricity
- D. It keeps the ground clamp from slipping
Why: Molten spatter and hot workpieces can drop onto benches or floors. Using steel, concrete, or fire-resistant welding blankets prevents accidental burns and fires caused by heat transfer to the surface beneath.
Q5. What should you do with your welding leads and cables before starting work?
- A. Coil them tightly into a knot to save space
- B. Lay them across walkways so they are easy to reach
- C. Inspect them for damage and keep them dry, organized, and out of walkways ✓
- D. Wrap them around your body for stability
Why: Damaged insulation can cause electric shock or short circuits, and cables lying in walkways create trip hazards. Inspecting leads and keeping them neatly routed and dry is a basic workspace safety step.
Module 5
Module 5: Basic Welding Joints and Positions
Basic Welding Joints and Positions
Knowledge check
Q1. Which of the following is the most common welding joint type used for connecting two pieces of metal that lie in the same plane, end to end?
- A. Lap joint
- B. Butt joint ✓
- C. T-joint
- D. Corner joint
Why: A butt joint is formed when two pieces of metal are aligned end to end in the same plane. It is one of the most common joint types and is widely used in pipe and plate welding.
Q2. In which joint type does one piece of metal overlap another piece, with the two surfaces joined along the overlapping area?
- A. Butt joint
- B. Edge joint
- C. Lap joint ✓
- D. Square joint
Why: A lap joint is created when two pieces of metal overlap each other and are welded along the overlapping surfaces. It is simple to fit up and is commonly used for sheet metal work.
Q3. Which welding position is generally considered the easiest for beginners because gravity helps keep the molten weld pool in place?
- A. Overhead position
- B. Vertical position
- C. Flat position ✓
- D. Horizontal position
Why: The flat position allows the weld pool to sit in the joint without sagging or dripping, since gravity acts directly down on the weld. This makes it the easiest and most forgiving position for new welders.
Q4. What welding position involves welding from underneath the joint, with the welder's head below the workpiece?
- A. Flat position
- B. Horizontal position
- C. Vertical position
- D. Overhead position ✓
Why: The overhead position requires the welder to weld from below the joint, working against gravity, which makes it one of the most difficult positions. The weld pool tends to drip, so skill and technique are essential.
Q5. Which joint is formed when two pieces of metal meet at a right angle, forming the shape of the letter T?
- A. Butt joint
- B. Lap joint
- C. T-joint ✓
- D. Edge joint
Why: A T-joint is formed when one piece of metal is placed perpendicular to another, resembling the letter T. It is widely used in structural and fabrication work, such as attaching a brace to a beam.
Module 6
Module 6: Stick Welding Fundamentals
Stick Welding Fundamentals
Knowledge check
Q1. What does the flux coating on a stick welding electrode primarily do during welding?
- A. It increases the electrical resistance of the arc
- B. It creates a protective gas shield and slag that protects the molten weld pool from contamination ✓
- C. It cools the base metal to prevent warping
- D. It adds carbon to the weld to increase hardness
Why: As the flux burns, it releases shielding gas that keeps oxygen and nitrogen away from the molten metal, and it forms a slag layer that covers and protects the cooling weld bead.
Q2. What is the recommended arc length when stick welding?
- A. As long as possible to cover more area
- B. Approximately equal to the diameter of the electrode core ✓
- C. Touching the electrode directly to the workpiece
- D. Several inches away from the workpiece
Why: Maintaining an arc length roughly equal to the electrode core diameter produces a stable arc and proper penetration; a longer arc leads to spatter and poor shielding, while touching the electrode causes it to stick.
Q3. Which type of electrical current is commonly used for stick welding with rutile-coated electrodes like E6013?
- A. Only DC electrode positive
- B. Only DC electrode negative
- C. Alternating current (AC) or DC ✓
- D. High-frequency pulsed current only
Why: E6013 electrodes are designed for easy arc starting and smooth operation and can be run on either AC or DC, making them popular for beginners and general-purpose work.
Q4. What is the purpose of the slag that forms on top of a stick weld bead?
- A. It adds strength to the weld metal
- B. It conducts electricity back to the machine
- C. It protects the hot weld metal from the atmosphere as it cools and must be chipped off afterward ✓
- D. It indicates the welder used the wrong amperage
Why: Slag shields the solidifying weld from oxidation and contamination, and it must be removed with a chipping hammer and wire brush before inspecting or welding additional passes.
Q5. What is the typical travel angle used when stick welding?
- A. Pushing the electrode about 90 degrees straight down
- B. Dragging the electrode at a 0-degree angle flat on the joint
- C. Holding the electrode at roughly 10 to 15 degrees in the direction of travel, either pushing or dragging ✓
- D. Holding the electrode at 45 degrees perpendicular to the direction of travel
Why: A travel angle of about 10 to 15 degrees in the direction of travel, with the electrode either pushed or dragged, helps control the weld pool and slag, and is the standard starting point for beginners.
Module 7
Module 7: Inspecting and Finishing Your Welds
Inspecting and Finishing Your Welds
Knowledge check
Q1. What is the most important first step when visually inspecting a completed weld?
- A. Painting the weld to protect it from rust
- B. Cleaning the weld and surrounding area of slag and spatter ✓
- C. Measuring the weld with a tape measure only
- D. Striking the weld with a hammer to test its strength
Why: Slag and spatter can hide cracks, undercut, and porosity. Cleaning the weld first allows an accurate visual inspection of its surface and profile.
Q2. Which of the following is a common visual defect that appears as a groove melted into the base metal along the edge of a weld?
- A. Porosity
- B. Spatter
- C. Undercut ✓
- D. Overlap
Why: Undercut is a groove or notch melted into the base metal at the toe of the weld. It weakens the joint because it reduces the effective cross-section of the material.
Q3. What does porosity in a weld look like?
- A. A smooth, shiny bead with even ripples
- B. Small holes or pits caused by trapped gas bubbles ✓
- C. A raised lump of extra filler metal
- D. A hairline break running along the weld bead
Why: Porosity consists of small holes or pockets formed when gas becomes trapped as the weld solidifies. It is often caused by contamination, moisture, or inadequate shielding gas coverage.
Q4. Why is a wire brush commonly used during the finishing stage of welding?
- A. To add a decorative texture to the weld
- B. To remove slag and oxidation from the weld and heat-affected area ✓
- C. To increase the thickness of the weld bead
- D. To test the hardness of the base metal
Why: A wire brush removes slag, scale, and oxidation so the weld can be properly inspected and prepared for painting, coating, or further processing.
Q5. Which finishing step is used to smooth a weld bead flush with the base metal, typically for appearance or to allow a part to fit against another surface?
- A. Quenching
- B. Grinding ✓
- C. Annealing
- D. Tack welding
Why: Grinding removes excess weld reinforcement and smooths the bead so it sits flush with the base metal. Care must be taken not to grind too deeply and reduce the weld's strength or thickness.