Welding & Fabrication worked example

Tack Weld Time at 23% repositioning and fit-check allowance: a worked example

This scenario runs the tack weld time calculation on the strong side: 23% repositioning and fit-check allowance, with every other input held at its documented default. Use it to estimate the time fitters and welders will spend tacking a weldment before final welding starts, so the schedule is not built on the run-down weld time alone.

The inputs for this scenario

  • Number of tacks to place: 24 tacks (unchanged)
  • Tacks placed per minute: 3 tacks / min (unchanged)
  • Repositioning and fit-check allowance: 23 % (raised for this scenario; the documented default is 20)

Working through the calculation

  • Applying the documented formula (Base tack weld time = number of tacks to place รท tacks placed per minute) to the inputs above produces each figure below.
  • At this operating point the engine returns 9.84 min for required tack weld time, the number this scenario is built around.
  • At this operating point the engine returns 8 min for base tack weld time.
  • At this operating point the engine returns 23 % for repositioning and fit-check allowance.
  • At this operating point the engine returns 3 pieces / min for tacks placed per minute.

How this compares with the baseline

  • Against the tool's baseline example, where repositioning and fit-check allowance sits at 20% and the headline result is 9.6 min, this scenario comes in 2.5% above the baseline at 9.84 min.
  • Use it when estimating fit-up labor, scheduling a fabrication cell, or quoting a weldment where setup time is a meaningful share of the job. Treat this as a target state: the delta against the baseline quantifies what the improvement is worth before you commit to chasing it.

Results at a glance

  • Required tack weld time: 9.84 min (headline result)
  • Base tack weld time: 8 min
  • Repositioning and fit-check allowance: 23 %
  • Tacks placed per minute: 3 pieces / min

Run it with your numbers

  • Every input above is editable in the live Tack Weld Time calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.