Comprehensive Welding Test Guide: Key
Concepts and Techniques| Question and
Answer Test| 2025/2026 Fall
What is the purpose of a weld joint design?
To ensure proper alignment of the materials and create a strong bond.
What is the difference between a groove weld and a fillet weld?
A groove weld is made in a groove, while a fillet weld is made on the edge of two materials.
What is the significance of the heat-affected zone (HAZ) in welding?
The HAZ is the area affected by heat that can change the properties of the material.
How does preheating help prevent welding defects?
Preheating reduces the chance of cracking by lowering temperature differences.
What is the role of shielding gas in MIG welding?
Shielding gas protects the weld from air contaminants.
What is the primary difference between AC and DC in welding?
AC is used for aluminum, while DC gives a more stable arc for other materials.
1
, What are the three main types of welding positions?
Flat, horizontal, and vertical positions.
What is the importance of filler material in welding?
Filler material is added to strengthen the weld.
What is the function of flux in flux-cored arc welding (FCAW)?
Flux shields the weld from contamination and helps create a clean weld.
What is the difference between a butt joint and a lap joint in welding?
A butt joint joins two materials edge-to-edge, while a lap joint overlaps them.
What is the primary role of a welding electrode?
The electrode provides the filler material for the weld.
How does the welding current affect the weld bead?
Higher current makes a larger bead with deeper penetration, while lower current gives a
smaller bead.
What is the function of the welding arc?
The arc generates the heat needed to melt the materials and form the weld.
2
Concepts and Techniques| Question and
Answer Test| 2025/2026 Fall
What is the purpose of a weld joint design?
To ensure proper alignment of the materials and create a strong bond.
What is the difference between a groove weld and a fillet weld?
A groove weld is made in a groove, while a fillet weld is made on the edge of two materials.
What is the significance of the heat-affected zone (HAZ) in welding?
The HAZ is the area affected by heat that can change the properties of the material.
How does preheating help prevent welding defects?
Preheating reduces the chance of cracking by lowering temperature differences.
What is the role of shielding gas in MIG welding?
Shielding gas protects the weld from air contaminants.
What is the primary difference between AC and DC in welding?
AC is used for aluminum, while DC gives a more stable arc for other materials.
1
, What are the three main types of welding positions?
Flat, horizontal, and vertical positions.
What is the importance of filler material in welding?
Filler material is added to strengthen the weld.
What is the function of flux in flux-cored arc welding (FCAW)?
Flux shields the weld from contamination and helps create a clean weld.
What is the difference between a butt joint and a lap joint in welding?
A butt joint joins two materials edge-to-edge, while a lap joint overlaps them.
What is the primary role of a welding electrode?
The electrode provides the filler material for the weld.
How does the welding current affect the weld bead?
Higher current makes a larger bead with deeper penetration, while lower current gives a
smaller bead.
What is the function of the welding arc?
The arc generates the heat needed to melt the materials and form the weld.
2
