What is the primary advantage of laser welding over traditional welding?

• • Lower equipment cost

• Higher precision with minimal heat-affected zone (HAZ)

• • Faster welding speed for all materials

• No need for shielding gas

Which gas is commonly used as an assist gas in laser cutting?

• Argon

• Nitrogen

• Hydrogen

• Helium

What type of laser is most commonly used for industrial metal welding?

• CO₂ laser

• Fiber laser

• Excimer laser

• Dye laser

What is the main purpose of a shielding gas in laser welding?

• To increase laser power

• To prevent oxidation and contamination of the weld pool

• To cool the workpiece faster

• To reduce reflectivity

Which welding defect is most associated with excessive laser power?

• Porosity

• Undercut

• Burn-through

• Lack of fusion

What is a key advantage of pulsed laser welding over continuous-wave (CW) laser welding?

• • Higher overall energy efficiency

• Better control over heat input, reducing distortion

• Faster welding speeds for thick materials

• No need for focusing optics

Which material property is most critical for successful laser welding?

• Electrical conductivity

• Thermal conductivity

• Magnetic permeability

• Hardness

What is the role of a beam delivery system in laser welding?

• To generate the laser beam

• To focus and direct the laser beam onto the workpiece

• To cool the laser source

• To measure weld penetration depth

Which of the following is NOT a common application of laser welding?

• Automotive body assembly

• Medical device manufacturing

• Underwater pipeline welding

• Electronics component joining

What is the primary challenge when welding highly reflective metals (e.g., aluminum, copper) with lasers?

• High material cost

• Low laser absorption leading to instability

• • Excessive spatter formation

• Rapid cooling rates