Question

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

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

Explanation:

Identify the weld position and joint geometry

Using the Overhead Groove Welding and 4G Weld Sequence knowledge points
The question asks for the third pass of a 4G (overhead groove) multi-pass weld. In overhead groove welding, gravity pulls the molten weld pool downward, requiring careful bead placement sequence to build up the joint properly.

Analyze the multi-pass bead layout

Using the Multi-pass Welding knowledge point
In a typical multi-pass groove weld:

• The first pass is the root pass, which is placed deepest in the joint (Bead A, not fully visible but at the root).
• The second pass (Bead B) is typically placed along one of the groove faces (often the upper or lower edge depending on the specific procedure, here shown on the right/upper side).
• The third pass (Bead C) is placed to fill the remaining space of that layer, tying into the previous bead and the opposite groove face.
• Looking at the diagram, the beads are labeled in alphabetical order of deposition sequence: Bead A (1st), Bead B (2nd), Bead C (3rd), Bead D (4th), Bead E (5th), and Bead F (6th). Therefore, the third pass corresponds to Bead C.

Answer:

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