Marine, Shipbuilding & Boat Manufacturing worked example

Marine Weld Labor Estimate at 29% inspection, repair, and downtime allowance: a worked example

This scenario runs the marine weld labor estimate calculation on the strong side: 29% inspection, repair, and downtime allowance, with every other input held at its documented default. Use it when planning welding crew allocation for a metal vessel hull or structural fabrication to estimate total weld hours and cost.

The inputs for this scenario

  • Total weld length on the hull or structure: 450 m (unchanged)
  • Average weld deposition rate (arc speed): 2.5 m / hr (unchanged)
  • Joint preparation and fit-up factor: 2 x (unchanged)
  • Inspection, repair, and downtime allowance: 29 % (raised for this scenario; the documented default is 25)

Working through the calculation

  • Applying the documented formula (Base weld time = total weld length / deposition rate) to the inputs above produces each figure below.
  • At this operating point the engine returns 184 hr for total weld labor hours, the number this scenario is built around.
  • At this operating point the engine returns 180 hr for base arc-time hours.
  • At this operating point the engine returns 2 % for inspection and repair hours.
  • At this operating point the engine returns 2.5 pieces / min for effective weld completion rate.

How this compares with the baseline

  • Against the tool's baseline example, where inspection, repair, and downtime allowance sits at 25% and the headline result is 184 hr, this scenario lands almost exactly on the baseline at 184 hr.
  • Use it when quoting a hull, deckhouse, tank, or structural fabrication package and you need man-hours rather than just arc-time. 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

  • Total weld labor hours: 184 hr (headline result)
  • Base arc-time hours: 180 hr
  • Inspection and repair hours: 2 %
  • Effective weld completion rate: 2.5 pieces / min

Run it with your numbers

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

Last reviewed 2026-05-12.