AWS AWS Joint Design & Weld Symbols 5 — Questions and Answers
Question 1: What is the purpose of a 'backing' symbol (rectangle) shown on a welding symbol?
- Indicates the weld must be ground flush
- Specifies a backing bar or strip is to be used on the root side (Correct answer)
- Denotes a back weld applied after the groove weld
- Identifies a weld performed in the flat position
Correct answer: Specifies a backing bar or strip is to be used on the root side
The backing symbol (rectangle) on the opposite side of the arrow specifies that a backing material shall be placed at the root of the joint.
Question 2: Which of the following correctly describes an edge joint?
- Two members joined at a 90-degree angle
- Two members whose surfaces are parallel and an edge of each is joined (Correct answer)
- Two overlapping members joined along their edges
- Two members joined at their beveled ends
Correct answer: Two members whose surfaces are parallel and an edge of each is joined
An edge joint joins the edges of two or more parallel or nearly parallel members.
Question 3: On a groove weld symbol, what does the number shown in parentheses indicate?
- Number of weld passes
- Depth of bevel
- Effective throat size (Correct answer)
- Root opening dimension
Correct answer: Effective throat size
A number in parentheses on a groove weld symbol indicates the effective throat (penetration depth) required.
Question 4: A plug weld symbol differs from a slot weld symbol primarily because:
- Plug welds are only used on pipe; slot welds are only used on plate
- Plug welds are circular holes; slot welds are elongated holes (Correct answer)
- Plug welds use filler metal; slot welds do not
- Plug welds are always full penetration; slot welds are partial
Correct answer: Plug welds are circular holes; slot welds are elongated holes
Plug welds fill circular holes, while slot welds fill elongated (oblong) holes in the overlapping member.
Question 5: What is the root opening in a joint design?
- The angle between the groove faces
- The distance between the base metal surfaces before welding
- The separation between the groove faces at the root of the joint (Correct answer)
- The depth of the groove below the surface
Correct answer: The separation between the groove faces at the root of the joint
The root opening is the separation between the members to be joined at the root of the joint, allowing for complete penetration.
Question 6: When a weld symbol includes the designation 'CJP', what does it mean?
- Cold Joint Procedure
- Complete Joint Penetration (Correct answer)
- Certified Joint Position
- Controlled Joint Profile
Correct answer: Complete Joint Penetration
CJP stands for Complete Joint Penetration, meaning the weld must fuse through the full thickness of the joint.
Question 7: In a T-joint, what is the included angle of the groove typically measured from?
- The horizontal base plate surface
- The vertical member face
- Between the two groove faces (Correct answer)
- Between the root face and the weld face
Correct answer: Between the two groove faces
The groove angle (included angle) is measured between the two groove faces that form the weld joint preparation.
AWS AWS Joint Design & Weld Symbols 5
What is the purpose of a 'backing' symbol (rectangle) shown on a welding symbol?