What is tack welding used for?

What is tack welding used for?

• A. Slow long welds for final pass.
• B. Welding with filler material only.
• C. Quick short welds used to hold parts in alignment before final welds.
• D. Post-weld heat treatment.

Answer: (C)

Tack welding is about temporarily holding parts in precise alignment during setup before the final welds. These quick, short beads keep pieces from shifting as you check fit-up and clamp everything in place, so the joints stay true when you apply the full weld sequence. Because the heat input is small and distributed, tack welds help minimize distortion and allow you to verify alignment without committing the joint to a full weld yet. They aren’t meant to provide final strength or serve as the finished weld, and they’re typically removed or incorporated into the final weld once alignment is confirmed.

Tack welding is about temporarily holding parts in precise alignment during setup before the final welds. These quick, short beads keep pieces from shifting as you check fit-up and clamp everything in place, so the joints stay true when you apply the full weld sequence. Because the heat input is small and distributed, tack welds help minimize distortion and allow you to verify alignment without committing the joint to a full weld yet. They aren’t meant to provide final strength or serve as the finished weld, and they’re typically removed or incorporated into the final weld once alignment is confirmed.