Question

identify where to place the fifth pass for this 2g weld.

bead b
bead e
bead a
bead f
bead d
bead c

Explanation:

Analyze the 2G weld joint geometry

Using the Horizontal Groove Welding knowledge point
In a 2G (horizontal groove) weld, gravity pulls the molten weld pool downward. To prevent sagging and ensure proper fusion, multi-pass welds are deposited in a specific sequence, typically starting from the bottom of each layer and building upward.

Determine the pass sequence

Using the 2G Weld Sequence knowledge point
Let's trace the sequence of the six weld beads shown in the cross-section diagram:

• First layer (Root pass): Bead A is the root pass at the narrowest part of the groove.
• Second layer (Fill passes): This layer consists of two beads. Due to gravity, the bottom bead is placed first to support the upper bead. Thus, Bead E (bottom) is the second pass, and Bead B (top) is the third pass.
• Third layer (Cover/Cap passes): This layer consists of three beads. Following the same bottom-to-top sequence:
• The bottom bead is placed first: Bead F (fourth pass).
• The middle bead is placed next: Bead I (fifth pass).
• The top bead is placed last: Bead C (sixth pass).

Identify the fifth pass

Using the 2G Weld Sequence knowledge point
Based on the bottom-to-top sequence for each layer:

1. First pass: Bead A
2. Second pass: Bead E
3. Third pass: Bead B
4. Fourth pass: Bead F
5. Fifth pass: Bead I
6. Sixth pass: Bead C

Therefore, the fifth pass is Bead I.

Answer:

• Bead B
• Bead I (Correct answer)
• Bead A
• Bead F
• Bead D
• Bead C