Question

identify where to place the fourth pass for this 4g weld.

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

Explanation:

Analyze the joint and welding position

Using the Overhead Groove Welding and 4G Weld Sequence knowledge points

The image shows a multi-pass fillet weld in the overhead position (4G/4F). The horizontal plate is on top, and the vertical plate is on the right, forming a corner/T-joint configuration welded from underneath.

Determine the deposition sequence

In multi-pass overhead fillet welding, gravity pulls the molten weld pool downward. To build a stable weld profile, beads are deposited systematically from the vertical member outward to the horizontal member, layer by layer:

• Layer 1 (Root): Bead A is deposited directly in the root corner.
• Layer 2: Bead B is placed on the horizontal plate next to Bead A, and Bead C is placed on the vertical plate to complete the second layer.
• Layer 3: To start the third layer, we begin again from the horizontal plate side and work outward/downward. Thus, the fourth pass (first bead of the third layer) is placed on the horizontal plate next to Bead B, which is labeled Bead D.
• Subsequent passes in Layer 3 are Bead E and Bead F to complete the face.

Identify the fourth pass

The sequence of deposition is:

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

Answer:

• Bead F
• Bead A</mcq-correct>
• Bead D (Correct answer)

<mcq-option>Bead C

• Bead E
• Bead B