What are runoff tabs used for?

What are runoff tabs used for?

• A. To guide alignment
• B. To reduce heat
• C. To shape weld bead
• D. To produce a sound weld

Answer: (D)

Runoff tabs are placed beyond the joint to give the welder a place to finish the weld. By ending the bead on the tab, you avoid creating a crater or lack of fusion at the very end of the weld, which can lead to cracks or weak spots as it cools. The tab is welded on so the weld can be completed and fused properly, then removed or ground away for a clean joint. This practice mainly helps ensure a sound, defect-free weld rather than guiding alignment, reducing heat, or shaping the bead.

Runoff tabs are placed beyond the joint to give the welder a place to finish the weld. By ending the bead on the tab, you avoid creating a crater or lack of fusion at the very end of the weld, which can lead to cracks or weak spots as it cools. The tab is welded on so the weld can be completed and fused properly, then removed or ground away for a clean joint. This practice mainly helps ensure a sound, defect-free weld rather than guiding alignment, reducing heat, or shaping the bead.