In a multi-pass weld, what is the name of the first bead deposited?

In a multi-pass weld, what is the name of the first bead deposited?

• A. Root pass
• B. Cap pass
• C. Fill pass
• D. Tie-in pass

Answer: (A)

The first bead deposited in a multi-pass weld is the root pass. This pass is laid along the joint root to establish penetration and fusion between the base metals, creating the foundational weld geometry. Once the root is solid, additional passes are used to fill the groove (fill passes) and then to shape the top surface (cap pass). A tie-in pass might be used later to ensure full fusion between beads, but it isn’t the initial bead. So the root pass is the starting bead that sets up the weld’s foundation.

The first bead deposited in a multi-pass weld is the root pass. This pass is laid along the joint root to establish penetration and fusion between the base metals, creating the foundational weld geometry. Once the root is solid, additional passes are used to fill the groove (fill passes) and then to shape the top surface (cap pass). A tie-in pass might be used later to ensure full fusion between beads, but it isn’t the initial bead. So the root pass is the starting bead that sets up the weld’s foundation.