PART B Wire Feed Welding Equipment and Consumables

Which of the following is NOT a primary method of wire feed welding with a external shielding gas?

• Gas Metal Arc Welding (GMAW / MIG)

• Flux-Cored Arc Welding (FCAW)

• Metal-Cored Arc Welding (MCAW)

• Submerged Arc Welding (SAW)

In the wire drawing process, what is the raw material used?

• Aluminum strips

• Low-carbon steel strips

• Copper wires

• Stainless steel rods

What is the purpose of copper coating on welding wire?

• Improves conductivity but can flake if excessive.

• Prevents the wire from melting too quickly.

• Increases the weight of the wire for stability.

• Reduces the need for shielding gas during welding.

In Gas Metal Arc Welding (GMAW / MIG), what forms between the workpiece and the solid wire electrode?

• Electric arc

• Magnetic field

• Cooling fan

• Insulation layer

Which gas is used as shielding gas in GMAW on mild steel?

• Oxygen

• Nitrogen

• Argon (Ar), CO₂, or mixtures

• 100% Argon

GMAW uses _______ for a stable arc when welding mild steel.

• DCEP

• AC

• DCEN

• HF

Match the welding component to its function:

• Pushes wire at controlled speed

• Wire Feeder

• Provides inert/active gas (e.g., 75% Ar + 25% CO₂ for steel)

• Welding Gun

• Delivers current, gas, and wire to the weld zone

• Shielding Gas Cylinder

• Maintains stable arc voltage

• Constant Voltage (CV) Power Source

Which metal transfer mode is best for thin metals and all positions?

• Short-Circuiting

• Globular

• Spray Transfer

• Pulsed Spray

Which metal transfer mode is characterized by large droplets and high spatter with GMAW?

• Globular

• Spray

• Short-circuiting

• Pulsed-spray

Which metal transfer mode is best for thick metals and flat/horizontal positions?

• Spray Transfer

• Short-Circuit Transfer

• Globular Transfer

• Pulsed Spray Transfer