CWI Joint Design and Weld Joint Types 1 — Questions and Answers
Question 1: What are the five basic weld joint types recognized by AWS?
- Butt, corner, tee, lap, and edge (Correct answer)
- Butt, groove, fillet, plug, and slot
- Butt, corner, tee, groove, and fillet
- Square, V-groove, bevel, U-groove, and J-groove
Correct answer: Butt, corner, tee, lap, and edge
AWS defines five basic joint types: butt, corner, tee, lap, and edge — these describe how members are positioned relative to each other, not the weld type itself.
Question 2: A tee joint is most commonly made using which type of weld?
- Plug weld
- Fillet weld (Correct answer)
- Square groove weld
- Slot weld
Correct answer: Fillet weld
Fillet welds are the most common weld type used in tee joints because they join the web member to the flange without requiring edge preparation.
Question 3: What is the typical included groove angle for a prequalified single-V groove weld per AWS D1.1?
- 30° to 40°
- 45° to 55°
- 60° to 70° (Correct answer)
- 80° to 90°
Correct answer: 60° to 70°
AWS D1.1 prequalified single-V groove welds require a minimum included groove angle of 60°, which falls in the 60° to 70° range commonly used in practice.
Question 4: For thick base metal, which groove configuration typically requires the least amount of filler metal compared to a single-V groove?
- Square groove
- Double-V groove (Correct answer)
- Single-bevel groove
- Single-J groove
Correct answer: Double-V groove
A double-V groove distributes the weld on both sides of the plate, reducing the total cross-sectional area of weld metal required compared to a single-V groove on one side.
Question 5: What is the primary purpose of a root opening in a groove weld joint?
- To increase the tensile strength of the completed weld
- To allow complete joint penetration and fusion at the root (Correct answer)
- To reduce the total amount of filler metal required
- To improve the surface appearance of the finished weld
Correct answer: To allow complete joint penetration and fusion at the root
The root opening (gap between members) provides space for the electrode or torch to access the root of the joint, ensuring complete fusion and penetration through the full thickness.
Question 6: Which joint type is formed when two members are joined at approximately right angles, with one member's edge meeting the flat face of the other member?
- Corner joint
- Butt joint
- Tee joint (Correct answer)
- Lap joint
Correct answer: Tee joint
A tee joint is formed when one member's end or edge is positioned perpendicular to the flat face of another member, creating a T-shape in cross section.
Question 7: The bevel angle of a groove weld is defined as the angle between the prepared face of the member and:
- The horizontal plane
- A plane perpendicular to the surface of the base metal (Correct answer)
- The opposite groove face
- The weld axis
Correct answer: A plane perpendicular to the surface of the base metal
The bevel angle is measured between the prepared groove face and a line perpendicular to the base metal surface; it equals half the included groove angle for symmetrical joints.
CWI Joint Design and Weld Joint Types 1
What are the five basic weld joint types recognized by AWS?