How do you calculate crane weldment cost?

Multiply seam length by cost per inch and by the full-penetration share, then add the fit-up and fixturing charge. For 4,800 in at $6.50/in with a 60% CJP share plus $8,000 fixturing, total cost is $26,720.

What is the cost per inch of crane weld seam?

Divide total weldment cost by seam length. In the example, $26,720 over 4,800 inches is about $5.57 per inch of seam, including fixturing.

Why does full-penetration weld share matter so much?

CJP welds require joint prep, multiple passes, and NDT, costing far more than fillets. Here the 60% CJP share sets the $18,720 variable cost; raising it pushes cost up sharply, so reducing CJP seam in design saves the most.

What drives crane weldment cost besides welding?

Fit-up and fixturing, jigs, tacking, alignment, and preheat setup on large box sections, is a major fixed cost, $8,000 here. It does not scale with seam length, so it hits short-seam weldments hardest per inch.

How can I reduce crane weldment cost?

Reduce total seam length, convert non-critical CJP joints to fillet or partial-pen where code allows, and amortize fixturing across more identical weldments. Each lowers either the $18,720 variable cost or the per-inch figure.

Does this include material and NDT?

The weld cost per inch should bundle consumables and can include NDT if you load it in; plate material is separate. Enter a rate that reflects what you want captured, and keep base steel as its own line.

Port, Crane & Terminal Equipment calculator

Crane Weldment Cost Calculator

Crane weldment cost estimates the fabrication cost of the heavy structural weldments in port and terminal cranes, box girders, sill beams, portal ties, where full-penetration (CJP) welds and rigorous fit-up dominate labor hours. Estimators and fabrication managers for ship-to-shore and RTG/RMG cranes use it to quote large weldments and to compare seam-reduction design options. Because CJP welds with NDT are far more expensive per inch than fillet welds, the full-penetration share is the single biggest cost lever on a crane structure. This calculator rolls seam length, weld rate, penetration share, and fixturing into a total and a cost per inch of seam.

What this calculator does

Estimate the fabrication cost of a port crane structural weldment from total weld seam length, per-inch welding cost, and the share of full-penetration joints.
A fabrication estimator prices the boom girder weldment on a ship-to-shore crane before committing to a steel package quote.
It estimates total weldment cost from seam length times weld cost per inch scaled by the full-penetration share, plus a fixed fit-up and fixturing charge, and gives cost per inch of seam.

Formula used

Weldment cost = seam length x cost per inch x full-penetration share% + fit-up/fixturing
Cost per inch of seam = total weldment cost / seam length

Inputs explained

Weld Seam Length:
Welding Cost per Inch:
Full-Penetration Weld Share:
Fit-Up & Fixturing Charge:

How to use the result

Use it when quoting crane structural weldments or evaluating a design change that adds or removes CJP seam.
It applies one blended weld rate and one CJP share across the whole weldment; real crane structures mix fillet, partial-pen, and CJP welds at very different costs, so segment the estimate for high accuracy.

Current U.S. benchmarks

U.S. housing starts run at 1,239k per year (Census, Jul 2026), down 13.5% from a year earlier, the demand driver for building products.
Steel mill PPI stands at 374.203 (BLS, Jul 2026), up 22.5% from a year earlier. New factory orders are up 7.4% year over year (Census).

Common questions

How do you calculate crane weldment cost? Multiply seam length by cost per inch and by the full-penetration share, then add the fit-up and fixturing charge. For 4,800 in at $6.50/in with a 60% CJP share plus $8,000 fixturing, total cost is $26,720.
What is the cost per inch of crane weld seam? Divide total weldment cost by seam length. In the example, $26,720 over 4,800 inches is about $5.57 per inch of seam, including fixturing.
Why does full-penetration weld share matter so much? CJP welds require joint prep, multiple passes, and NDT, costing far more than fillets. Here the 60% CJP share sets the $18,720 variable cost; raising it pushes cost up sharply, so reducing CJP seam in design saves the most.
What drives crane weldment cost besides welding? Fit-up and fixturing, jigs, tacking, alignment, and preheat setup on large box sections, is a major fixed cost, $8,000 here. It does not scale with seam length, so it hits short-seam weldments hardest per inch.
How can I reduce crane weldment cost? Reduce total seam length, convert non-critical CJP joints to fillet or partial-pen where code allows, and amortize fixturing across more identical weldments. Each lowers either the $18,720 variable cost or the per-inch figure.

Last reviewed 2026-07-13.